diff --git a/src/compiler/binder.ts b/src/compiler/binder.ts
index be9e9a525c0d5..87b0bd86d200c 100644
--- a/src/compiler/binder.ts
+++ b/src/compiler/binder.ts
@@ -51,17 +51,6 @@ module ts {
         }
     }
 
-    /**
-     * A declaration has a dynamic name if both of the following are true:
-     *   1. The declaration has a computed property name
-     *   2. The computed name is *not* expressed as Symbol.<name>, where name
-     *      is a property of the Symbol constructor that denotes a built in
-     *      Symbol.
-     */
-    export function hasDynamicName(declaration: Declaration): boolean {
-        return declaration.name && declaration.name.kind === SyntaxKind.ComputedPropertyName;
-    }
-
     export function bindSourceFile(file: SourceFile): void {
         var start = new Date().getTime();
         bindSourceFileWorker(file);
@@ -98,13 +87,18 @@ module ts {
             if (symbolKind & SymbolFlags.Value && !symbol.valueDeclaration) symbol.valueDeclaration = node;
         }
 
-        // Should not be called on a declaration with a computed property name.
+        // Should not be called on a declaration with a computed property name,
+        // unless it is a well known Symbol.
         function getDeclarationName(node: Declaration): string {
             if (node.name) {
                 if (node.kind === SyntaxKind.ModuleDeclaration && node.name.kind === SyntaxKind.StringLiteral) {
                     return '"' + (<LiteralExpression>node.name).text + '"';
                 }
-                Debug.assert(!hasDynamicName(node));
+                if (node.name.kind === SyntaxKind.ComputedPropertyName) {
+                    var nameExpression = (<ComputedPropertyName>node.name).expression;
+                    Debug.assert(isWellKnownSymbolSyntactically(nameExpression));
+                    return getPropertyNameForKnownSymbolName((<PropertyAccessExpression>nameExpression).name.text);
+                }
                 return (<Identifier | LiteralExpression>node.name).text;
             }
             switch (node.kind) {
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index b9f8857cb2335..aab9f49eae6ba 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -67,6 +67,7 @@ module ts {
         var stringType = createIntrinsicType(TypeFlags.String, "string");
         var numberType = createIntrinsicType(TypeFlags.Number, "number");
         var booleanType = createIntrinsicType(TypeFlags.Boolean, "boolean");
+        var esSymbolType = createIntrinsicType(TypeFlags.ESSymbol, "symbol");
         var voidType = createIntrinsicType(TypeFlags.Void, "void");
         var undefinedType = createIntrinsicType(TypeFlags.Undefined | TypeFlags.ContainsUndefinedOrNull, "undefined");
         var nullType = createIntrinsicType(TypeFlags.Null | TypeFlags.ContainsUndefinedOrNull, "null");
@@ -84,6 +85,7 @@ module ts {
         var globals: SymbolTable = {};
 
         var globalArraySymbol: Symbol;
+        var globalESSymbolConstructorSymbol: Symbol;
 
         var globalObjectType: ObjectType;
         var globalFunctionType: ObjectType;
@@ -93,6 +95,7 @@ module ts {
         var globalBooleanType: ObjectType;
         var globalRegExpType: ObjectType;
         var globalTemplateStringsArrayType: ObjectType;
+        var globalESSymbolType: ObjectType;
 
         var anyArrayType: Type;
 
@@ -120,6 +123,10 @@ module ts {
             "boolean": {
                 type: booleanType,
                 flags: TypeFlags.Boolean
+            },
+            "symbol": {
+                type: esSymbolType,
+                flags: TypeFlags.ESSymbol
             }
         };
 
@@ -706,9 +713,15 @@ module ts {
             return type;
         }
 
-        // A reserved member name starts with two underscores followed by a non-underscore
+        // A reserved member name starts with two underscores, but the third character cannot be an underscore
+        // or the @ symbol. A third underscore indicates an escaped form of an identifer that started
+        // with at least two underscores. The @ character indicates that the name is denoted by a well known ES
+        // Symbol instance.
         function isReservedMemberName(name: string) {
-            return name.charCodeAt(0) === CharacterCodes._ && name.charCodeAt(1) === CharacterCodes._ && name.charCodeAt(2) !== CharacterCodes._;
+            return name.charCodeAt(0) === CharacterCodes._ &&
+                name.charCodeAt(1) === CharacterCodes._ &&
+                name.charCodeAt(2) !== CharacterCodes._ &&
+                name.charCodeAt(2) !== CharacterCodes.at;
         }
 
         function getNamedMembers(members: SymbolTable): Symbol[] {
@@ -2489,9 +2502,9 @@ module ts {
             return getPropertiesOfObjectType(getApparentType(type));
         }
 
-        // For a type parameter, return the base constraint of the type parameter. For the string, number, and
-        // boolean primitive types, return the corresponding object types.Otherwise return the type itself.
-        // Note that the apparent type of a union type is the union type itself.
+        // For a type parameter, return the base constraint of the type parameter. For the string, number,
+        // boolean, and symbol primitive types, return the corresponding object types. Otherwise return the
+        // type itself. Note that the apparent type of a union type is the union type itself.
         function getApparentType(type: Type): Type {
             if (type.flags & TypeFlags.TypeParameter) {
                 do {
@@ -2510,6 +2523,9 @@ module ts {
             else if (type.flags & TypeFlags.Boolean) {
                 type = globalBooleanType;
             }
+            else if (type.flags & TypeFlags.ESSymbol) {
+                type = globalESSymbolType;
+            }
             return type;
         }
 
@@ -2999,12 +3015,24 @@ module ts {
             return <ObjectType>type;
         }
 
-        function getGlobalSymbol(name: string): Symbol {
-            return resolveName(undefined, name, SymbolFlags.Type, Diagnostics.Cannot_find_global_type_0, name);
+        function getGlobalValueSymbol(name: string): Symbol {
+            return getGlobalSymbol(name, SymbolFlags.Value, Diagnostics.Cannot_find_global_value_0);
+        }
+
+        function getGlobalTypeSymbol(name: string): Symbol {
+            return getGlobalSymbol(name, SymbolFlags.Type, Diagnostics.Cannot_find_global_type_0);
+        }
+
+        function getGlobalSymbol(name: string, meaning: SymbolFlags, diagnostic: DiagnosticMessage): Symbol {
+            return resolveName(undefined, name, meaning, diagnostic, name);
         }
 
         function getGlobalType(name: string): ObjectType {
-            return getTypeOfGlobalSymbol(getGlobalSymbol(name), 0);
+            return getTypeOfGlobalSymbol(getGlobalTypeSymbol(name), 0);
+        }
+
+        function getGlobalESSymbolConstructorSymbol() {
+            return globalESSymbolConstructorSymbol || (globalESSymbolConstructorSymbol = getGlobalValueSymbol("Symbol"));
         }
 
         function createArrayType(elementType: Type): Type {
@@ -3174,6 +3202,8 @@ module ts {
                     return numberType;
                 case SyntaxKind.BooleanKeyword:
                     return booleanType;
+                case SyntaxKind.SymbolKeyword:
+                    return esSymbolType;
                 case SyntaxKind.VoidKeyword:
                     return voidType;
                 case SyntaxKind.StringLiteral:
@@ -4740,7 +4770,7 @@ module ts {
                 if (assumeTrue) {
                     // Assumed result is true. If check was not for a primitive type, remove all primitive types
                     if (!typeInfo) {
-                        return removeTypesFromUnionType(type, /*typeKind*/ TypeFlags.StringLike | TypeFlags.NumberLike | TypeFlags.Boolean, /*isOfTypeKind*/ true);
+                        return removeTypesFromUnionType(type, /*typeKind*/ TypeFlags.StringLike | TypeFlags.NumberLike | TypeFlags.Boolean | TypeFlags.ESSymbol, /*isOfTypeKind*/ true);
                     }
                     // Check was for a primitive type, return that primitive type if it is a subtype
                     if (isTypeSubtypeOf(typeInfo.type, type)) {
@@ -5475,7 +5505,7 @@ module ts {
         function isNumericComputedName(name: ComputedPropertyName): boolean {
             // It seems odd to consider an expression of type Any to result in a numeric name,
             // but this behavior is consistent with checkIndexedAccess
-            return isTypeOfKind(checkComputedPropertyName(name), TypeFlags.Any | TypeFlags.NumberLike);
+            return allConstituentTypesHaveKind(checkComputedPropertyName(name), TypeFlags.Any | TypeFlags.NumberLike);
         }
 
         function isNumericLiteralName(name: string) {
@@ -5508,10 +5538,13 @@ module ts {
             if (!links.resolvedType) {
                 links.resolvedType = checkExpression(node.expression);
 
-                // This will allow types number, string, or any. It will also allow enums, the unknown
+                // This will allow types number, string, symbol or any. It will also allow enums, the unknown
                 // type, and any union of these types (like string | number).
-                if (!isTypeOfKind(links.resolvedType, TypeFlags.Any | TypeFlags.NumberLike | TypeFlags.StringLike)) {
-                    error(node, Diagnostics.A_computed_property_name_must_be_of_type_string_number_or_any);
+                if (!allConstituentTypesHaveKind(links.resolvedType, TypeFlags.Any | TypeFlags.NumberLike | TypeFlags.StringLike | TypeFlags.ESSymbol)) {
+                    error(node, Diagnostics.A_computed_property_name_must_be_of_type_string_number_symbol_or_any);
+                }
+                else {
+                    checkThatExpressionIsProperSymbolReference(node.expression, links.resolvedType, /*reportError*/ true);
                 }
             }
 
@@ -5760,8 +5793,8 @@ module ts {
 
             // See if we can index as a property.
             if (node.argumentExpression) {
-                if (node.argumentExpression.kind === SyntaxKind.StringLiteral || node.argumentExpression.kind === SyntaxKind.NumericLiteral) {
-                    var name = (<LiteralExpression>node.argumentExpression).text;
+                var name = getPropertyNameForIndexedAccess(node.argumentExpression, indexType);
+                if (name !== undefined) {
                     var prop = getPropertyOfType(objectType, name);
                     if (prop) {
                         getNodeLinks(node).resolvedSymbol = prop;
@@ -5775,10 +5808,10 @@ module ts {
             }
 
             // Check for compatible indexer types.
-            if (isTypeOfKind(indexType, TypeFlags.Any | TypeFlags.StringLike | TypeFlags.NumberLike)) {
+            if (allConstituentTypesHaveKind(indexType, TypeFlags.Any | TypeFlags.StringLike | TypeFlags.NumberLike | TypeFlags.ESSymbol)) {
 
                 // Try to use a number indexer.
-                if (isTypeOfKind(indexType, TypeFlags.Any | TypeFlags.NumberLike)) {
+                if (allConstituentTypesHaveKind(indexType, TypeFlags.Any | TypeFlags.NumberLike)) {
                     var numberIndexType = getIndexTypeOfType(objectType, IndexKind.Number);
                     if (numberIndexType) {
                         return numberIndexType;
@@ -5800,11 +5833,78 @@ module ts {
             }
 
             // REVIEW: Users should know the type that was actually used.
-            error(node, Diagnostics.An_index_expression_argument_must_be_of_type_string_number_or_any);
+            error(node, Diagnostics.An_index_expression_argument_must_be_of_type_string_number_symbol_or_any);
 
             return unknownType;
         }
 
+        /**
+         * If indexArgumentExpression is a string literal or number literal, returns its text.
+         * If indexArgumentExpression is a well known symbol, returns the property name corresponding
+         *    to this symbol, as long as it is a proper symbol reference.
+         * Otherwise, returns undefined.
+         */
+        function getPropertyNameForIndexedAccess(indexArgumentExpression: Expression, indexArgumentType: Type): string {
+            if (indexArgumentExpression.kind === SyntaxKind.StringLiteral || indexArgumentExpression.kind === SyntaxKind.NumericLiteral) {
+                return (<LiteralExpression>indexArgumentExpression).text;
+            }
+            if (checkThatExpressionIsProperSymbolReference(indexArgumentExpression, indexArgumentType, /*reportError*/ false)) {
+                var rightHandSideName = (<Identifier>(<PropertyAccessExpression>indexArgumentExpression).name).text;
+                return getPropertyNameForKnownSymbolName(rightHandSideName);
+            }
+
+            return undefined;
+        }
+
+        /**
+         * A proper symbol reference requires the following:
+         *   1. The property access denotes a property that exists
+         *   2. The expression is of the form Symbol.<identifier>
+         *   3. The property access is of the primitive type symbol.
+         *   4. Symbol in this context resolves to the global Symbol object
+         */
+        function checkThatExpressionIsProperSymbolReference(expression: Expression, expressionType: Type, reportError: boolean): boolean {
+            if (expressionType === unknownType) {
+                // There is already an error, so no need to report one.
+                return false;
+            }
+
+            if (!isWellKnownSymbolSyntactically(expression)) {
+                return false;
+            }
+
+            // Make sure the property type is the primitive symbol type
+            if ((expressionType.flags & TypeFlags.ESSymbol) === 0) {
+                if (reportError) {
+                    error(expression, Diagnostics.A_computed_property_name_of_the_form_0_must_be_of_type_symbol, getTextOfNode(expression));
+                }
+                return false;
+            }
+
+            // The name is Symbol.<someName>, so make sure Symbol actually resolves to the
+            // global Symbol object
+            var leftHandSide = <Identifier>(<PropertyAccessExpression>expression).expression;
+            var leftHandSideSymbol = getResolvedSymbol(leftHandSide);
+            if (!leftHandSideSymbol) {
+                return false;
+            }
+            
+            var globalESSymbol = getGlobalESSymbolConstructorSymbol();
+            if (!globalESSymbol) {
+                // Already errored when we tried to look up the symbol
+                return false;
+            }
+
+            if (leftHandSideSymbol !== globalESSymbol) {
+                if (reportError) {
+                    error(leftHandSide, Diagnostics.Symbol_reference_does_not_refer_to_the_global_Symbol_constructor_object);
+                }
+                return false;
+            }
+
+            return true;
+        }
+
         function resolveUntypedCall(node: CallLikeExpression): Signature {
             if (node.kind === SyntaxKind.TaggedTemplateExpression) {
                 checkExpression((<TaggedTemplateExpression>node).template);
@@ -6719,7 +6819,7 @@ module ts {
         }
 
         function checkArithmeticOperandType(operand: Node, type: Type, diagnostic: DiagnosticMessage): boolean {
-            if (!isTypeOfKind(type, TypeFlags.Any | TypeFlags.NumberLike)) {
+            if (!allConstituentTypesHaveKind(type, TypeFlags.Any | TypeFlags.NumberLike)) {
                 error(operand, diagnostic);
                 return false;
             }
@@ -6835,6 +6935,9 @@ module ts {
                 case SyntaxKind.PlusToken:
                 case SyntaxKind.MinusToken:
                 case SyntaxKind.TildeToken:
+                    if (someConstituentTypeHasKind(operandType, TypeFlags.ESSymbol)) {
+                        error(node.operand, Diagnostics.The_0_operator_cannot_be_applied_to_type_symbol, tokenToString(node.operator));
+                    }
                     return numberType;
                 case SyntaxKind.ExclamationToken:
                     return booleanType;
@@ -6870,8 +6973,26 @@ module ts {
             return numberType;
         }
 
-        // Return true if type has the given flags, or is a union type composed of types that all have those flags
-        function isTypeOfKind(type: Type, kind: TypeFlags): boolean {
+        // Just like isTypeOfKind below, except that it returns true if *any* constituent
+        // has this kind.
+        function someConstituentTypeHasKind(type: Type, kind: TypeFlags): boolean {
+            if (type.flags & kind) {
+                return true;
+            }
+            if (type.flags & TypeFlags.Union) {
+                var types = (<UnionType>type).types;
+                for (var i = 0; i < types.length; i++) {
+                    if (types[i].flags & kind) {
+                        return true;
+                    }
+                }
+                return false;
+            }
+            return false;
+        }
+
+        // Return true if type has the given flags, or is a union type composed of types that all have those flags.
+        function allConstituentTypesHaveKind(type: Type, kind: TypeFlags): boolean {
             if (type.flags & kind) {
                 return true;
             }
@@ -6901,7 +7022,7 @@ module ts {
             // and the right operand to be of type Any or a subtype of the 'Function' interface type. 
             // The result is always of the Boolean primitive type.
             // NOTE: do not raise error if leftType is unknown as related error was already reported
-            if (isTypeOfKind(leftType, TypeFlags.Primitive)) {
+            if (allConstituentTypesHaveKind(leftType, TypeFlags.Primitive)) {
                 error(node.left, Diagnostics.The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_parameter);
             }
             // NOTE: do not raise error if right is unknown as related error was already reported
@@ -6916,10 +7037,10 @@ module ts {
             // The in operator requires the left operand to be of type Any, the String primitive type, or the Number primitive type,
             // and the right operand to be of type Any, an object type, or a type parameter type.
             // The result is always of the Boolean primitive type.
-            if (!isTypeOfKind(leftType, TypeFlags.Any | TypeFlags.StringLike | TypeFlags.NumberLike)) {
-                error(node.left, Diagnostics.The_left_hand_side_of_an_in_expression_must_be_of_types_any_string_or_number);
+            if (!allConstituentTypesHaveKind(leftType, TypeFlags.Any | TypeFlags.StringLike | TypeFlags.NumberLike | TypeFlags.ESSymbol)) {
+                error(node.left, Diagnostics.The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol);
             }
-            if (!isTypeOfKind(rightType, TypeFlags.Any | TypeFlags.ObjectType | TypeFlags.TypeParameter)) {
+            if (!allConstituentTypesHaveKind(rightType, TypeFlags.Any | TypeFlags.ObjectType | TypeFlags.TypeParameter)) {
                 error(node.right, Diagnostics.The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter);
             }
             return booleanType;
@@ -7080,19 +7201,26 @@ module ts {
                     if (rightType.flags & (TypeFlags.Undefined | TypeFlags.Null)) rightType = leftType;
 
                     var resultType: Type;
-                    if (isTypeOfKind(leftType, TypeFlags.NumberLike) && isTypeOfKind(rightType, TypeFlags.NumberLike)) {
+                    if (allConstituentTypesHaveKind(leftType, TypeFlags.NumberLike) && allConstituentTypesHaveKind(rightType, TypeFlags.NumberLike)) {
                         // Operands of an enum type are treated as having the primitive type Number.
                         // If both operands are of the Number primitive type, the result is of the Number primitive type.
                         resultType = numberType;
                     }
-                    else if (isTypeOfKind(leftType, TypeFlags.StringLike) || isTypeOfKind(rightType, TypeFlags.StringLike)) {
-                        // If one or both operands are of the String primitive type, the result is of the String primitive type.
-                        resultType = stringType;
-                    }
-                    else if (leftType.flags & TypeFlags.Any || rightType.flags & TypeFlags.Any) {
-                        // Otherwise, the result is of type Any.
-                        // NOTE: unknown type here denotes error type. Old compiler treated this case as any type so do we.
-                        resultType = anyType;
+                    else {
+                        if (allConstituentTypesHaveKind(leftType, TypeFlags.StringLike) || allConstituentTypesHaveKind(rightType, TypeFlags.StringLike)) {
+                            // If one or both operands are of the String primitive type, the result is of the String primitive type.
+                            resultType = stringType;
+                        }
+                        else if (leftType.flags & TypeFlags.Any || rightType.flags & TypeFlags.Any) {
+                            // Otherwise, the result is of type Any.
+                            // NOTE: unknown type here denotes error type. Old compiler treated this case as any type so do we.
+                            resultType = anyType;
+                        }
+
+                        // Symbols are not allowed at all in arithmetic expressions
+                        if (resultType && !checkForDisallowedESSymbolOperand(operator)) {
+                            return resultType;
+                        }
                     }
 
                     if (!resultType) {
@@ -7104,14 +7232,18 @@ module ts {
                         checkAssignmentOperator(resultType);
                     }
                     return resultType;
-                case SyntaxKind.EqualsEqualsToken:
-                case SyntaxKind.ExclamationEqualsToken:
-                case SyntaxKind.EqualsEqualsEqualsToken:
-                case SyntaxKind.ExclamationEqualsEqualsToken:
                 case SyntaxKind.LessThanToken:
                 case SyntaxKind.GreaterThanToken:
                 case SyntaxKind.LessThanEqualsToken:
                 case SyntaxKind.GreaterThanEqualsToken:
+                    if (!checkForDisallowedESSymbolOperand(operator)) {
+                        return booleanType;
+                    }
+                    // Fall through
+                case SyntaxKind.EqualsEqualsToken:
+                case SyntaxKind.ExclamationEqualsToken:
+                case SyntaxKind.EqualsEqualsEqualsToken:
+                case SyntaxKind.ExclamationEqualsEqualsToken:
                     if (!isTypeAssignableTo(leftType, rightType) && !isTypeAssignableTo(rightType, leftType)) {
                         reportOperatorError();
                     }
@@ -7131,6 +7263,20 @@ module ts {
                     return rightType;
             }
 
+            // Return type is true if there was no error, false if there was an error.
+            function checkForDisallowedESSymbolOperand(operator: SyntaxKind): boolean {
+                var offendingSymbolOperand =
+                    someConstituentTypeHasKind(leftType, TypeFlags.ESSymbol) ? node.left :
+                    someConstituentTypeHasKind(rightType, TypeFlags.ESSymbol) ? node.right :
+                    undefined;
+                if (offendingSymbolOperand) {
+                    error(offendingSymbolOperand, Diagnostics.The_0_operator_cannot_be_applied_to_type_symbol, tokenToString(operator));
+                    return false;
+                }
+
+                return true;
+            }
+
             function getSuggestedBooleanOperator(operator: SyntaxKind): SyntaxKind {
                 switch (operator) {
                     case SyntaxKind.BarToken:
@@ -7216,7 +7362,10 @@ module ts {
         }
 
         function checkPropertyAssignment(node: PropertyAssignment, contextualMapper?: TypeMapper): Type {
-            if (hasDynamicName(node)) {
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name.kind === SyntaxKind.ComputedPropertyName) {
                 checkComputedPropertyName(<ComputedPropertyName>node.name);
             }
 
@@ -7227,7 +7376,10 @@ module ts {
             // Grammar checking
             checkGrammarMethod(node);
 
-            if (hasDynamicName(node)) {
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name.kind === SyntaxKind.ComputedPropertyName) {
                 checkComputedPropertyName(<ComputedPropertyName>node.name);
             }
 
@@ -7490,7 +7642,7 @@ module ts {
 
         function checkPropertyDeclaration(node: PropertyDeclaration) {
             // Grammar checking
-            checkGrammarModifiers(node) || checkGrammarProperty(node);
+            checkGrammarModifiers(node) || checkGrammarProperty(node) || checkGrammarComputedPropertyName(node.name);
 
             checkVariableLikeDeclaration(node);
         }
@@ -8039,12 +8191,16 @@ module ts {
         function checkFunctionLikeDeclaration(node: FunctionLikeDeclaration): void {
             checkSignatureDeclaration(node);
 
-            if (hasDynamicName(node)) {
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name.kind === SyntaxKind.ComputedPropertyName) {
                 // This check will account for methods in class/interface declarations,
                 // as well as accessors in classes/object literals
                 checkComputedPropertyName(<ComputedPropertyName>node.name);
             }
-            else {
+
+            if (!hasDynamicName(node)) {
                 // first we want to check the local symbol that contain this declaration
                 // - if node.localSymbol !== undefined - this is current declaration is exported and localSymbol points to the local symbol
                 // - if node.localSymbol === undefined - this node is non-exported so we can just pick the result of getSymbolOfNode
@@ -8302,12 +8458,14 @@ module ts {
         function checkVariableLikeDeclaration(node: VariableLikeDeclaration) {
             checkSourceElement(node.type);
             // For a computed property, just check the initializer and exit
-            if (hasDynamicName(node)) {
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name.kind === SyntaxKind.ComputedPropertyName) {
                 checkComputedPropertyName(<ComputedPropertyName>node.name);
                 if (node.initializer) {
                     checkExpressionCached(node.initializer);
                 }
-                return;
             }
             // For a binding pattern, check contained binding elements
             if (isBindingPattern(node.name)) {
@@ -8482,7 +8640,7 @@ module ts {
                 //   and Expr must be an expression of type Any, an object type, or a type parameter type.
                 var varExpr = <Expression>node.initializer;
                 var exprType = checkExpression(varExpr);
-                if (exprType !== anyType && exprType !== stringType) {
+                if (!allConstituentTypesHaveKind(exprType, TypeFlags.Any | TypeFlags.StringLike)) {
                     error(varExpr, Diagnostics.The_left_hand_side_of_a_for_in_statement_must_be_of_type_string_or_any);
                 }
                 else {
@@ -8494,7 +8652,7 @@ module ts {
             var exprType = checkExpression(node.expression);
             // unknownType is returned i.e. if node.expression is identifier whose name cannot be resolved
             // in this case error about missing name is already reported - do not report extra one
-            if (!isTypeOfKind(exprType, TypeFlags.Any | TypeFlags.ObjectType | TypeFlags.TypeParameter)) {
+            if (!allConstituentTypesHaveKind(exprType, TypeFlags.Any | TypeFlags.ObjectType | TypeFlags.TypeParameter)) {
                 error(node.expression, Diagnostics.The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter);
             }
 
@@ -8745,6 +8903,7 @@ module ts {
                 case "number":
                 case "boolean":
                 case "string":
+                case "symbol":
                 case "void":
                     error(name, message, (<Identifier>name).text);
             }
@@ -8963,7 +9122,7 @@ module ts {
                             var typeName1 = typeToString(existing.containingType);
                             var typeName2 = typeToString(base);
 
-                            var errorInfo = chainDiagnosticMessages(undefined, Diagnostics.Named_properties_0_of_types_1_and_2_are_not_identical, prop.name, typeName1, typeName2);
+                            var errorInfo = chainDiagnosticMessages(undefined, Diagnostics.Named_property_0_of_types_1_and_2_are_not_identical, symbolToString(prop), typeName1, typeName2);
                             errorInfo = chainDiagnosticMessages(errorInfo, Diagnostics.Interface_0_cannot_simultaneously_extend_types_1_and_2, typeToString(type), typeName1, typeName2);
                             diagnostics.add(createDiagnosticForNodeFromMessageChain(typeNode, errorInfo));
                         }
@@ -9755,6 +9914,7 @@ module ts {
                 case SyntaxKind.NumberKeyword:
                 case SyntaxKind.StringKeyword:
                 case SyntaxKind.BooleanKeyword:
+                case SyntaxKind.SymbolKeyword:
                     return true;
                 case SyntaxKind.VoidKeyword:
                     return node.parent.kind !== SyntaxKind.VoidExpression;
@@ -10279,7 +10439,7 @@ module ts {
             getSymbolLinks(unknownSymbol).type = unknownType;
             globals[undefinedSymbol.name] = undefinedSymbol;
             // Initialize special types
-            globalArraySymbol = getGlobalSymbol("Array");
+            globalArraySymbol = getGlobalTypeSymbol("Array");
             globalArrayType = getTypeOfGlobalSymbol(globalArraySymbol, 1);
             globalObjectType = getGlobalType("Object");
             globalFunctionType = getGlobalType("Function");
@@ -10287,11 +10447,24 @@ module ts {
             globalNumberType = getGlobalType("Number");
             globalBooleanType = getGlobalType("Boolean");
             globalRegExpType = getGlobalType("RegExp");
+
             // If we're in ES6 mode, load the TemplateStringsArray.
             // Otherwise, default to 'unknown' for the purposes of type checking in LS scenarios.
-            globalTemplateStringsArrayType = languageVersion >= ScriptTarget.ES6
-                ? getGlobalType("TemplateStringsArray")
-                : unknownType;
+            if (languageVersion >= ScriptTarget.ES6) {
+                globalTemplateStringsArrayType = getGlobalType("TemplateStringsArray");
+                globalESSymbolType = getGlobalType("Symbol");
+                globalESSymbolConstructorSymbol = getGlobalValueSymbol("Symbol");
+            }
+            else {
+                globalTemplateStringsArrayType = unknownType;
+
+                // Consider putting Symbol interface in lib.d.ts. On the plus side, putting it in lib.d.ts would make it
+                // extensible for Polyfilling Symbols. But putting it into lib.d.ts could also break users that have
+                // a global Symbol already, particularly if it is a class.
+                globalESSymbolType = createAnonymousType(undefined, emptySymbols, emptyArray, emptyArray, undefined, undefined);
+                globalESSymbolConstructorSymbol = undefined;
+            }
+
             anyArrayType = createArrayType(anyType);
         }
 
@@ -10506,25 +10679,25 @@ module ts {
                     return grammarErrorOnNode(node, Diagnostics.An_index_signature_must_have_exactly_one_parameter);
                 }
             }
-            else if (parameter.dotDotDotToken) {
+            if (parameter.dotDotDotToken) {
                 return grammarErrorOnNode(parameter.dotDotDotToken, Diagnostics.An_index_signature_cannot_have_a_rest_parameter);
             }
-            else if (parameter.flags & NodeFlags.Modifier) {
+            if (parameter.flags & NodeFlags.Modifier) {
                 return grammarErrorOnNode(parameter.name, Diagnostics.An_index_signature_parameter_cannot_have_an_accessibility_modifier);
             }
-            else if (parameter.questionToken) {
+            if (parameter.questionToken) {
                 return grammarErrorOnNode(parameter.questionToken, Diagnostics.An_index_signature_parameter_cannot_have_a_question_mark);
             }
-            else if (parameter.initializer) {
+            if (parameter.initializer) {
                 return grammarErrorOnNode(parameter.name, Diagnostics.An_index_signature_parameter_cannot_have_an_initializer);
             }
-            else if (!parameter.type) {
+            if (!parameter.type) {
                 return grammarErrorOnNode(parameter.name, Diagnostics.An_index_signature_parameter_must_have_a_type_annotation);
             }
-            else if (parameter.type.kind !== SyntaxKind.StringKeyword && parameter.type.kind !== SyntaxKind.NumberKeyword) {
+            if (parameter.type.kind !== SyntaxKind.StringKeyword && parameter.type.kind !== SyntaxKind.NumberKeyword) {
                 return grammarErrorOnNode(parameter.name, Diagnostics.An_index_signature_parameter_type_must_be_string_or_number);
             }
-            else if (!node.type) {
+            if (!node.type) {
                 return grammarErrorOnNode(node, Diagnostics.An_index_signature_must_have_a_type_annotation);
             }
         }
@@ -10797,8 +10970,8 @@ module ts {
             }
         }
 
-        function checkGrammarForDisallowedComputedProperty(node: DeclarationName, message: DiagnosticMessage) {
-            if (node.kind === SyntaxKind.ComputedPropertyName) {
+        function checkGrammarForNonSymbolComputedProperty(node: DeclarationName, message: DiagnosticMessage) {
+            if (node.kind === SyntaxKind.ComputedPropertyName && !isWellKnownSymbolSyntactically((<ComputedPropertyName>node).expression)) {
                 return grammarErrorOnNode(node, message);
             }
         }
@@ -10829,17 +11002,17 @@ module ts {
                 // and accessors are not allowed in ambient contexts in general,
                 // so this error only really matters for methods.
                 if (isInAmbientContext(node)) {
-                    return checkGrammarForDisallowedComputedProperty(node.name, Diagnostics.Computed_property_names_are_not_allowed_in_an_ambient_context);
+                    return checkGrammarForNonSymbolComputedProperty(node.name, Diagnostics.A_computed_property_name_in_an_ambient_context_must_directly_refer_to_a_built_in_symbol);
                 }
                 else if (!node.body) {
-                    return checkGrammarForDisallowedComputedProperty(node.name, Diagnostics.Computed_property_names_are_not_allowed_in_method_overloads);
+                    return checkGrammarForNonSymbolComputedProperty(node.name, Diagnostics.A_computed_property_name_in_a_method_overload_must_directly_refer_to_a_built_in_symbol);
                 }
             }
             else if (node.parent.kind === SyntaxKind.InterfaceDeclaration) {
-                return checkGrammarForDisallowedComputedProperty(node.name, Diagnostics.Computed_property_names_are_not_allowed_in_interfaces);
+                return checkGrammarForNonSymbolComputedProperty(node.name, Diagnostics.A_computed_property_name_in_an_interface_must_directly_refer_to_a_built_in_symbol);
             }
             else if (node.parent.kind === SyntaxKind.TypeLiteral) {
-                return checkGrammarForDisallowedComputedProperty(node.name, Diagnostics.Computed_property_names_are_not_allowed_in_type_literals);
+                return checkGrammarForNonSymbolComputedProperty(node.name, Diagnostics.A_computed_property_name_in_a_type_literal_must_directly_refer_to_a_built_in_symbol);
             }
         }
 
@@ -11053,6 +11226,9 @@ module ts {
                 var inAmbientContext = isInAmbientContext(enumDecl);
                 for (var i = 0, n = enumDecl.members.length; i < n; i++) {
                     var node = enumDecl.members[i];
+                    // Do not use hasDynamicName here, because that returns false for well known symbols.
+                    // We want to perform checkComputedPropertyName for all computed properties, including
+                    // well known symbols.
                     if (node.name.kind === SyntaxKind.ComputedPropertyName) {
                         hasError = grammarErrorOnNode(node.name, Diagnostics.Computed_property_names_are_not_allowed_in_enums);
                     }
@@ -11133,17 +11309,17 @@ module ts {
         function checkGrammarProperty(node: PropertyDeclaration) {
             if (node.parent.kind === SyntaxKind.ClassDeclaration) {
                 if (checkGrammarForInvalidQuestionMark(node, node.questionToken, Diagnostics.A_class_member_cannot_be_declared_optional) ||
-                    checkGrammarForDisallowedComputedProperty(node.name, Diagnostics.Computed_property_names_are_not_allowed_in_class_property_declarations)) {
+                    checkGrammarForNonSymbolComputedProperty(node.name, Diagnostics.A_computed_property_name_in_a_class_property_declaration_must_directly_refer_to_a_built_in_symbol)) {
                     return true;
                 }
             }
             else if (node.parent.kind === SyntaxKind.InterfaceDeclaration) {
-                if (checkGrammarForDisallowedComputedProperty(node.name, Diagnostics.Computed_property_names_are_not_allowed_in_interfaces)) {
+                if (checkGrammarForNonSymbolComputedProperty(node.name, Diagnostics.A_computed_property_name_in_an_interface_must_directly_refer_to_a_built_in_symbol)) {
                     return true;
                 }
             }
             else if (node.parent.kind === SyntaxKind.TypeLiteral) {
-                if (checkGrammarForDisallowedComputedProperty(node.name, Diagnostics.Computed_property_names_are_not_allowed_in_type_literals)) {
+                if (checkGrammarForNonSymbolComputedProperty(node.name, Diagnostics.A_computed_property_name_in_a_type_literal_must_directly_refer_to_a_built_in_symbol)) {
                     return true;
                 }
             }
diff --git a/src/compiler/diagnosticInformationMap.generated.ts b/src/compiler/diagnosticInformationMap.generated.ts
index 2c64f8ff4b008..386d4300ade3f 100644
--- a/src/compiler/diagnosticInformationMap.generated.ts
+++ b/src/compiler/diagnosticInformationMap.generated.ts
@@ -123,12 +123,12 @@ module ts {
         An_object_member_cannot_be_declared_optional: { code: 1162, category: DiagnosticCategory.Error, key: "An object member cannot be declared optional." },
         yield_expression_must_be_contained_within_a_generator_declaration: { code: 1163, category: DiagnosticCategory.Error, key: "'yield' expression must be contained_within a generator declaration." },
         Computed_property_names_are_not_allowed_in_enums: { code: 1164, category: DiagnosticCategory.Error, key: "Computed property names are not allowed in enums." },
-        Computed_property_names_are_not_allowed_in_an_ambient_context: { code: 1165, category: DiagnosticCategory.Error, key: "Computed property names are not allowed in an ambient context." },
-        Computed_property_names_are_not_allowed_in_class_property_declarations: { code: 1166, category: DiagnosticCategory.Error, key: "Computed property names are not allowed in class property declarations." },
+        A_computed_property_name_in_an_ambient_context_must_directly_refer_to_a_built_in_symbol: { code: 1165, category: DiagnosticCategory.Error, key: "A computed property name in an ambient context must directly refer to a built-in symbol." },
+        A_computed_property_name_in_a_class_property_declaration_must_directly_refer_to_a_built_in_symbol: { code: 1166, category: DiagnosticCategory.Error, key: "A computed property name in a class property declaration must directly refer to a built-in symbol." },
         Computed_property_names_are_only_available_when_targeting_ECMAScript_6_and_higher: { code: 1167, category: DiagnosticCategory.Error, key: "Computed property names are only available when targeting ECMAScript 6 and higher." },
-        Computed_property_names_are_not_allowed_in_method_overloads: { code: 1168, category: DiagnosticCategory.Error, key: "Computed property names are not allowed in method overloads." },
-        Computed_property_names_are_not_allowed_in_interfaces: { code: 1169, category: DiagnosticCategory.Error, key: "Computed property names are not allowed in interfaces." },
-        Computed_property_names_are_not_allowed_in_type_literals: { code: 1170, category: DiagnosticCategory.Error, key: "Computed property names are not allowed in type literals." },
+        A_computed_property_name_in_a_method_overload_must_directly_refer_to_a_built_in_symbol: { code: 1168, category: DiagnosticCategory.Error, key: "A computed property name in a method overload must directly refer to a built-in symbol." },
+        A_computed_property_name_in_an_interface_must_directly_refer_to_a_built_in_symbol: { code: 1169, category: DiagnosticCategory.Error, key: "A computed property name in an interface must directly refer to a built-in symbol." },
+        A_computed_property_name_in_a_type_literal_must_directly_refer_to_a_built_in_symbol: { code: 1170, category: DiagnosticCategory.Error, key: "A computed property name in a type literal must directly refer to a built-in symbol." },
         A_comma_expression_is_not_allowed_in_a_computed_property_name: { code: 1171, category: DiagnosticCategory.Error, key: "A comma expression is not allowed in a computed property name." },
         extends_clause_already_seen: { code: 1172, category: DiagnosticCategory.Error, key: "'extends' clause already seen." },
         extends_clause_must_precede_implements_clause: { code: 1173, category: DiagnosticCategory.Error, key: "'extends' clause must precede 'implements' clause." },
@@ -166,7 +166,7 @@ module ts {
         Global_type_0_must_be_a_class_or_interface_type: { code: 2316, category: DiagnosticCategory.Error, key: "Global type '{0}' must be a class or interface type." },
         Global_type_0_must_have_1_type_parameter_s: { code: 2317, category: DiagnosticCategory.Error, key: "Global type '{0}' must have {1} type parameter(s)." },
         Cannot_find_global_type_0: { code: 2318, category: DiagnosticCategory.Error, key: "Cannot find global type '{0}'." },
-        Named_properties_0_of_types_1_and_2_are_not_identical: { code: 2319, category: DiagnosticCategory.Error, key: "Named properties '{0}' of types '{1}' and '{2}' are not identical." },
+        Named_property_0_of_types_1_and_2_are_not_identical: { code: 2319, category: DiagnosticCategory.Error, key: "Named property '{0}' of types '{1}' and '{2}' are not identical." },
         Interface_0_cannot_simultaneously_extend_types_1_and_2: { code: 2320, category: DiagnosticCategory.Error, key: "Interface '{0}' cannot simultaneously extend types '{1}' and '{2}'." },
         Excessive_stack_depth_comparing_types_0_and_1: { code: 2321, category: DiagnosticCategory.Error, key: "Excessive stack depth comparing types '{0}' and '{1}'." },
         Type_0_is_not_assignable_to_type_1: { code: 2322, category: DiagnosticCategory.Error, key: "Type '{0}' is not assignable to type '{1}'." },
@@ -188,7 +188,7 @@ module ts {
         Property_0_does_not_exist_on_type_1: { code: 2339, category: DiagnosticCategory.Error, key: "Property '{0}' does not exist on type '{1}'." },
         Only_public_and_protected_methods_of_the_base_class_are_accessible_via_the_super_keyword: { code: 2340, category: DiagnosticCategory.Error, key: "Only public and protected methods of the base class are accessible via the 'super' keyword" },
         Property_0_is_private_and_only_accessible_within_class_1: { code: 2341, category: DiagnosticCategory.Error, key: "Property '{0}' is private and only accessible within class '{1}'." },
-        An_index_expression_argument_must_be_of_type_string_number_or_any: { code: 2342, category: DiagnosticCategory.Error, key: "An index expression argument must be of type 'string', 'number', or 'any'." },
+        An_index_expression_argument_must_be_of_type_string_number_symbol_or_any: { code: 2342, category: DiagnosticCategory.Error, key: "An index expression argument must be of type 'string', 'number', 'symbol, or 'any'." },
         Type_0_does_not_satisfy_the_constraint_1: { code: 2344, category: DiagnosticCategory.Error, key: "Type '{0}' does not satisfy the constraint '{1}'." },
         Argument_of_type_0_is_not_assignable_to_parameter_of_type_1: { code: 2345, category: DiagnosticCategory.Error, key: "Argument of type '{0}' is not assignable to parameter of type '{1}'." },
         Supplied_parameters_do_not_match_any_signature_of_call_target: { code: 2346, category: DiagnosticCategory.Error, key: "Supplied parameters do not match any signature of call target." },
@@ -204,7 +204,7 @@ module ts {
         The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_property_or_indexer: { code: 2357, category: DiagnosticCategory.Error, key: "The operand of an increment or decrement operator must be a variable, property or indexer." },
         The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: { code: 2358, category: DiagnosticCategory.Error, key: "The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter." },
         The_right_hand_side_of_an_instanceof_expression_must_be_of_type_any_or_of_a_type_assignable_to_the_Function_interface_type: { code: 2359, category: DiagnosticCategory.Error, key: "The right-hand side of an 'instanceof' expression must be of type 'any' or of a type assignable to the 'Function' interface type." },
-        The_left_hand_side_of_an_in_expression_must_be_of_types_any_string_or_number: { code: 2360, category: DiagnosticCategory.Error, key: "The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'." },
+        The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol: { code: 2360, category: DiagnosticCategory.Error, key: "The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'." },
         The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: { code: 2361, category: DiagnosticCategory.Error, key: "The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter" },
         The_left_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: { code: 2362, category: DiagnosticCategory.Error, key: "The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type." },
         The_right_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: { code: 2363, category: DiagnosticCategory.Error, key: "The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type." },
@@ -299,20 +299,24 @@ module ts {
         Type_0_is_not_an_array_type: { code: 2461, category: DiagnosticCategory.Error, key: "Type '{0}' is not an array type." },
         A_rest_element_must_be_last_in_an_array_destructuring_pattern: { code: 2462, category: DiagnosticCategory.Error, key: "A rest element must be last in an array destructuring pattern" },
         A_binding_pattern_parameter_cannot_be_optional_in_an_implementation_signature: { code: 2463, category: DiagnosticCategory.Error, key: "A binding pattern parameter cannot be optional in an implementation signature." },
-        A_computed_property_name_must_be_of_type_string_number_or_any: { code: 2464, category: DiagnosticCategory.Error, key: "A computed property name must be of type 'string', 'number', or 'any'." },
+        A_computed_property_name_must_be_of_type_string_number_symbol_or_any: { code: 2464, category: DiagnosticCategory.Error, key: "A computed property name must be of type 'string', 'number', 'symbol', or 'any'." },
         this_cannot_be_referenced_in_a_computed_property_name: { code: 2465, category: DiagnosticCategory.Error, key: "'this' cannot be referenced in a computed property name." },
         super_cannot_be_referenced_in_a_computed_property_name: { code: 2466, category: DiagnosticCategory.Error, key: "'super' cannot be referenced in a computed property name." },
-        A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type: { code: 2466, category: DiagnosticCategory.Error, key: "A computed property name cannot reference a type parameter from its containing type." },
-        Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_6_and_higher: { code: 2468, category: DiagnosticCategory.Error, key: "Spread operator in 'new' expressions is only available when targeting ECMAScript 6 and higher." },
-        Enum_declarations_must_all_be_const_or_non_const: { code: 2469, category: DiagnosticCategory.Error, key: "Enum declarations must all be const or non-const." },
-        In_const_enum_declarations_member_initializer_must_be_constant_expression: { code: 2470, category: DiagnosticCategory.Error, key: "In 'const' enum declarations member initializer must be constant expression." },
-        const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_import_declaration_or_export_assignment: { code: 2471, category: DiagnosticCategory.Error, key: "'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment." },
-        A_const_enum_member_can_only_be_accessed_using_a_string_literal: { code: 2472, category: DiagnosticCategory.Error, key: "A const enum member can only be accessed using a string literal." },
-        const_enum_member_initializer_was_evaluated_to_a_non_finite_value: { code: 2473, category: DiagnosticCategory.Error, key: "'const' enum member initializer was evaluated to a non-finite value." },
-        const_enum_member_initializer_was_evaluated_to_disallowed_value_NaN: { code: 2474, category: DiagnosticCategory.Error, key: "'const' enum member initializer was evaluated to disallowed value 'NaN'." },
-        Property_0_does_not_exist_on_const_enum_1: { code: 2475, category: DiagnosticCategory.Error, key: "Property '{0}' does not exist on 'const' enum '{1}'." },
-        let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations: { code: 2476, category: DiagnosticCategory.Error, key: "'let' is not allowed to be used as a name in 'let' or 'const' declarations." },
-        Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1: { code: 2477, category: DiagnosticCategory.Error, key: "Cannot initialize outer scoped variable '{0}' in the same scope as block scoped declaration '{1}'." },
+        A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type: { code: 2467, category: DiagnosticCategory.Error, key: "A computed property name cannot reference a type parameter from its containing type." },
+        Cannot_find_global_value_0: { code: 2468, category: DiagnosticCategory.Error, key: "Cannot find global value '{0}'." },
+        The_0_operator_cannot_be_applied_to_type_symbol: { code: 2469, category: DiagnosticCategory.Error, key: "The '{0}' operator cannot be applied to type 'symbol'." },
+        Symbol_reference_does_not_refer_to_the_global_Symbol_constructor_object: { code: 2470, category: DiagnosticCategory.Error, key: "'Symbol' reference does not refer to the global Symbol constructor object." },
+        A_computed_property_name_of_the_form_0_must_be_of_type_symbol: { code: 2471, category: DiagnosticCategory.Error, key: "A computed property name of the form '{0}' must be of type 'symbol'." },
+        Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_6_and_higher: { code: 2472, category: DiagnosticCategory.Error, key: "Spread operator in 'new' expressions is only available when targeting ECMAScript 6 and higher." },
+        Enum_declarations_must_all_be_const_or_non_const: { code: 2473, category: DiagnosticCategory.Error, key: "Enum declarations must all be const or non-const." },
+        In_const_enum_declarations_member_initializer_must_be_constant_expression: { code: 2474, category: DiagnosticCategory.Error, key: "In 'const' enum declarations member initializer must be constant expression." },
+        const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_import_declaration_or_export_assignment: { code: 2475, category: DiagnosticCategory.Error, key: "'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment." },
+        A_const_enum_member_can_only_be_accessed_using_a_string_literal: { code: 2476, category: DiagnosticCategory.Error, key: "A const enum member can only be accessed using a string literal." },
+        const_enum_member_initializer_was_evaluated_to_a_non_finite_value: { code: 2477, category: DiagnosticCategory.Error, key: "'const' enum member initializer was evaluated to a non-finite value." },
+        const_enum_member_initializer_was_evaluated_to_disallowed_value_NaN: { code: 2478, category: DiagnosticCategory.Error, key: "'const' enum member initializer was evaluated to disallowed value 'NaN'." },
+        Property_0_does_not_exist_on_const_enum_1: { code: 2479, category: DiagnosticCategory.Error, key: "Property '{0}' does not exist on 'const' enum '{1}'." },
+        let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations: { code: 2480, category: DiagnosticCategory.Error, key: "'let' is not allowed to be used as a name in 'let' or 'const' declarations." },
+        Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1: { code: 2481, category: DiagnosticCategory.Error, key: "Cannot initialize outer scoped variable '{0}' in the same scope as block scoped declaration '{1}'." },
         Import_declaration_0_is_using_private_name_1: { code: 4000, category: DiagnosticCategory.Error, key: "Import declaration '{0}' is using private name '{1}'." },
         Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: { code: 4002, category: DiagnosticCategory.Error, key: "Type parameter '{0}' of exported class has or is using private name '{1}'." },
         Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: { code: 4004, category: DiagnosticCategory.Error, key: "Type parameter '{0}' of exported interface has or is using private name '{1}'." },
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 8299e9f773300..37a67c94a2b4c 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -483,11 +483,11 @@
         "category": "Error",
         "code": 1164
     },
-    "Computed property names are not allowed in an ambient context.": {
+    "A computed property name in an ambient context must directly refer to a built-in symbol.": {
         "category": "Error",
         "code": 1165
     },
-    "Computed property names are not allowed in class property declarations.": {
+    "A computed property name in a class property declaration must directly refer to a built-in symbol.": {
         "category": "Error",
         "code": 1166
     },
@@ -495,15 +495,15 @@
         "category": "Error",
         "code": 1167
     },
-    "Computed property names are not allowed in method overloads.": {
+    "A computed property name in a method overload must directly refer to a built-in symbol.": {
         "category": "Error",
         "code": 1168
     },
-    "Computed property names are not allowed in interfaces.": {
+    "A computed property name in an interface must directly refer to a built-in symbol.": {
         "category": "Error",
         "code": 1169
     },
-    "Computed property names are not allowed in type literals.": {
+    "A computed property name in a type literal must directly refer to a built-in symbol.": {
         "category": "Error",
         "code": 1170
     },
@@ -656,7 +656,7 @@
         "category": "Error",
         "code": 2318
     },
-    "Named properties '{0}' of types '{1}' and '{2}' are not identical.": {
+    "Named property '{0}' of types '{1}' and '{2}' are not identical.": {
         "category": "Error",
         "code": 2319
     },
@@ -744,7 +744,7 @@
         "category": "Error",
         "code": 2341
     },
-    "An index expression argument must be of type 'string', 'number', or 'any'.": {
+    "An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.": {
         "category": "Error",
         "code": 2342
     },
@@ -808,7 +808,7 @@
         "category": "Error",
         "code": 2359
     },
-    "The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.": {
+    "The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.": {
         "category": "Error",
         "code": 2360
     },
@@ -1188,7 +1188,7 @@
         "category": "Error",
         "code": 2463
     },
-    "A computed property name must be of type 'string', 'number', or 'any'.": {
+    "A computed property name must be of type 'string', 'number', 'symbol', or 'any'.": {
         "category": "Error",
         "code": 2464
     },
@@ -1202,48 +1202,64 @@
     },
     "A computed property name cannot reference a type parameter from its containing type.": {
         "category": "Error",
-        "code": 2466
+        "code": 2467
     },
-    "Spread operator in 'new' expressions is only available when targeting ECMAScript 6 and higher.": {
+    "Cannot find global value '{0}'.": {
         "category": "Error",
         "code": 2468
     },
-    "Enum declarations must all be const or non-const.": {
+    "The '{0}' operator cannot be applied to type 'symbol'.": {
         "category": "Error",
         "code": 2469
     },
-    "In 'const' enum declarations member initializer must be constant expression.": {
+    "'Symbol' reference does not refer to the global Symbol constructor object.": {
         "category": "Error",
         "code": 2470
     },
-    "'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.": {
+    "A computed property name of the form '{0}' must be of type 'symbol'.": {
         "category": "Error",
         "code": 2471
     },
-    "A const enum member can only be accessed using a string literal.": {
+    "Spread operator in 'new' expressions is only available when targeting ECMAScript 6 and higher.": {
         "category": "Error",
         "code": 2472
     },
-    "'const' enum member initializer was evaluated to a non-finite value.": {
+    "Enum declarations must all be const or non-const.": {
         "category": "Error",
         "code": 2473
     },
-    "'const' enum member initializer was evaluated to disallowed value 'NaN'.": {
+    "In 'const' enum declarations member initializer must be constant expression.": {
         "category": "Error",
         "code": 2474
     },
-    "Property '{0}' does not exist on 'const' enum '{1}'.": {
+    "'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.": {
         "category": "Error",
         "code": 2475
     },
-    "'let' is not allowed to be used as a name in 'let' or 'const' declarations.": {
+    "A const enum member can only be accessed using a string literal.": {
         "category": "Error",
         "code": 2476
     },
-    "Cannot initialize outer scoped variable '{0}' in the same scope as block scoped declaration '{1}'.": {
+    "'const' enum member initializer was evaluated to a non-finite value.": {
         "category": "Error",
         "code": 2477
     },
+    "'const' enum member initializer was evaluated to disallowed value 'NaN'.": {
+        "category": "Error",
+        "code": 2478
+    },
+    "Property '{0}' does not exist on 'const' enum '{1}'.": {
+        "category": "Error",
+        "code": 2479
+    },
+    "'let' is not allowed to be used as a name in 'let' or 'const' declarations.": {
+        "category": "Error",
+        "code": 2480
+    },
+    "Cannot initialize outer scoped variable '{0}' in the same scope as block scoped declaration '{1}'.": {
+        "category": "Error",
+        "code": 2481
+    },
 
     "Import declaration '{0}' is using private name '{1}'.": {
         "category": "Error",
diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 6a2338268e899..ddf17f8d0d650 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -275,7 +275,7 @@ module ts {
         var firstAccessor: AccessorDeclaration;
         var getAccessor: AccessorDeclaration;
         var setAccessor: AccessorDeclaration;
-        if (accessor.name.kind === SyntaxKind.ComputedPropertyName) {
+        if (hasDynamicName(accessor)) {
             firstAccessor = accessor;
             if (accessor.kind === SyntaxKind.GetAccessor) {
                 getAccessor = accessor;
@@ -289,19 +289,22 @@ module ts {
         }
         else {
             forEach(node.members,(member: Declaration) => {
-                if ((member.kind === SyntaxKind.GetAccessor || member.kind === SyntaxKind.SetAccessor) &&
-                    (<Identifier>member.name).text === (<Identifier>accessor.name).text &&
-                    (member.flags & NodeFlags.Static) === (accessor.flags & NodeFlags.Static)) {
-                    if (!firstAccessor) {
-                        firstAccessor = <AccessorDeclaration>member;
-                    }
+                if ((member.kind === SyntaxKind.GetAccessor || member.kind === SyntaxKind.SetAccessor)
+                    && (member.flags & NodeFlags.Static) === (accessor.flags & NodeFlags.Static)) {
+                    var memberName = getPropertyNameForPropertyNameNode(member.name);
+                    var accessorName = getPropertyNameForPropertyNameNode(accessor.name);
+                    if (memberName === accessorName) {
+                        if (!firstAccessor) {
+                            firstAccessor = <AccessorDeclaration>member;
+                        }
 
-                    if (member.kind === SyntaxKind.GetAccessor && !getAccessor) {
-                        getAccessor = <AccessorDeclaration>member;
-                    }
+                        if (member.kind === SyntaxKind.GetAccessor && !getAccessor) {
+                            getAccessor = <AccessorDeclaration>member;
+                        }
 
-                    if (member.kind === SyntaxKind.SetAccessor && !setAccessor) {
-                        setAccessor = <AccessorDeclaration>member;
+                        if (member.kind === SyntaxKind.SetAccessor && !setAccessor) {
+                            setAccessor = <AccessorDeclaration>member;
+                        }
                     }
                 }
             });
@@ -579,6 +582,7 @@ module ts {
                 case SyntaxKind.StringKeyword:
                 case SyntaxKind.NumberKeyword:
                 case SyntaxKind.BooleanKeyword:
+                case SyntaxKind.SymbolKeyword:
                 case SyntaxKind.VoidKeyword:
                 case SyntaxKind.StringLiteral:
                     return writeTextOfNode(currentSourceFile, type);
diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index 630418dc485ac..9b3c01cf0f07d 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -2593,6 +2593,7 @@ module ts {
                 case SyntaxKind.StringKeyword:
                 case SyntaxKind.NumberKeyword:
                 case SyntaxKind.BooleanKeyword:
+                case SyntaxKind.SymbolKeyword:
                     // If these are followed by a dot, then parse these out as a dotted type reference instead.
                     var node = tryParse(parseKeywordAndNoDot);
                     return node || parseTypeReference();
@@ -2617,6 +2618,7 @@ module ts {
                 case SyntaxKind.StringKeyword:
                 case SyntaxKind.NumberKeyword:
                 case SyntaxKind.BooleanKeyword:
+                case SyntaxKind.SymbolKeyword:
                 case SyntaxKind.VoidKeyword:
                 case SyntaxKind.TypeOfKeyword:
                 case SyntaxKind.OpenBraceToken:
diff --git a/src/compiler/scanner.ts b/src/compiler/scanner.ts
index fbbd69bbd6924..f85df69f026e6 100644
--- a/src/compiler/scanner.ts
+++ b/src/compiler/scanner.ts
@@ -82,6 +82,7 @@ module ts {
         "string": SyntaxKind.StringKeyword,
         "super": SyntaxKind.SuperKeyword,
         "switch": SyntaxKind.SwitchKeyword,
+        "symbol": SyntaxKind.SymbolKeyword,
         "this": SyntaxKind.ThisKeyword,
         "throw": SyntaxKind.ThrowKeyword,
         "true": SyntaxKind.TrueKeyword,
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 12c5af21e1298..72ef66e3fe1c2 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -140,6 +140,7 @@ module ts {
         NumberKeyword,
         SetKeyword,
         StringKeyword,
+        SymbolKeyword,
         TypeKeyword,
 
         // Parse tree nodes
@@ -1298,9 +1299,10 @@ module ts {
         ObjectLiteral           = 0x00020000,  // Originates in an object literal
         ContainsUndefinedOrNull = 0x00040000,  // Type is or contains Undefined or Null type
         ContainsObjectLiteral   = 0x00080000,  // Type is or contains object literal type
+        ESSymbol                = 0x00100000,  // Type of symbol primitive introduced in ES6
 
-        Intrinsic = Any | String | Number | Boolean | Void | Undefined | Null,
-        Primitive = String | Number | Boolean | Void | Undefined | Null | StringLiteral | Enum,
+        Intrinsic = Any | String | Number | Boolean | ESSymbol | Void | Undefined | Null,
+        Primitive = String | Number | Boolean | ESSymbol | Void | Undefined | Null | StringLiteral | Enum,
         StringLike = String | StringLiteral,
         NumberLike = Number | Enum,
         ObjectType = Class | Interface | Reference | Tuple | Anonymous,
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index 5a50e2799dc7c..0656bed7d5fbf 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -835,6 +835,54 @@ module ts {
         return SyntaxKind.FirstTriviaToken <= token && token <= SyntaxKind.LastTriviaToken;
     }
 
+    /**
+     * A declaration has a dynamic name if both of the following are true:
+     *   1. The declaration has a computed property name
+     *   2. The computed name is *not* expressed as Symbol.<name>, where name
+     *      is a property of the Symbol constructor that denotes a built in
+     *      Symbol.
+     */
+    export function hasDynamicName(declaration: Declaration): boolean {
+        return declaration.name &&
+            declaration.name.kind === SyntaxKind.ComputedPropertyName &&
+            !isWellKnownSymbolSyntactically((<ComputedPropertyName>declaration.name).expression);
+    }
+
+    /**
+     * Checks if the expression is of the form:
+     *    Symbol.name
+     * where Symbol is literally the word "Symbol", and name is any identifierName
+     */
+    export function isWellKnownSymbolSyntactically(node: Expression): boolean {
+        return node.kind === SyntaxKind.PropertyAccessExpression && isESSymbolIdentifier((<PropertyAccessExpression>node).expression);
+    }
+
+    export function getPropertyNameForPropertyNameNode(name: DeclarationName): string {
+        if (name.kind === SyntaxKind.Identifier || name.kind === SyntaxKind.StringLiteral || name.kind === SyntaxKind.NumericLiteral) {
+            return (<Identifier | LiteralExpression>name).text;
+        }
+        if (name.kind === SyntaxKind.ComputedPropertyName) {
+            var nameExpression = (<ComputedPropertyName>name).expression;
+            if (isWellKnownSymbolSyntactically(nameExpression)) {
+                var rightHandSideName = (<PropertyAccessExpression>nameExpression).name.text;
+                return getPropertyNameForKnownSymbolName(rightHandSideName);
+            }
+        }
+
+        return undefined;
+    }
+
+    export function getPropertyNameForKnownSymbolName(symbolName: string): string {
+        return "__@" + symbolName;
+    }
+
+    /**
+     * Includes the word "Symbol" with unicode escapes
+     */
+    export function isESSymbolIdentifier(node: Node): boolean {
+        return node.kind === SyntaxKind.Identifier && (<Identifier>node).text === "Symbol";
+    }
+
     export function isModifier(token: SyntaxKind): boolean {
         switch (token) {
             case SyntaxKind.PublicKeyword:
diff --git a/src/lib/es6.d.ts b/src/lib/es6.d.ts
index b666b11b96946..50238e94bb4f9 100644
--- a/src/lib/es6.d.ts
+++ b/src/lib/es6.d.ts
@@ -1,4 +1,4 @@
-declare type PropertyKey = string | number | Symbol;
+declare type PropertyKey = string | number | symbol;
 
 interface Symbol {
     /** Returns a string representation of an object. */
@@ -7,7 +7,7 @@ interface Symbol {
     /** Returns the primitive value of the specified object. */
     valueOf(): Object;
 
-    // [Symbol.toStringTag]: string;
+    [Symbol.toStringTag]: string;
 }
 
 interface SymbolConstructor {
@@ -20,21 +20,21 @@ interface SymbolConstructor {
       * Returns a new unique Symbol value.
       * @param  description Description of the new Symbol object.
       */
-    (description?: string|number): Symbol;
+    (description?: string|number): symbol;
 
     /**
       * Returns a Symbol object from the global symbol registry matching the given key if found. 
       * Otherwise, returns a new symbol with this key.
       * @param key key to search for.
       */
-    for(key: string): Symbol;
+    for(key: string): symbol;
 
     /**
       * Returns a key from the global symbol registry matching the given Symbol if found. 
       * Otherwise, returns a undefined.
       * @param sym Symbol to find the key for.
       */
-    keyFor(sym: Symbol): string;
+    keyFor(sym: symbol): string;
 
     // Well-known Symbols
 
@@ -42,42 +42,42 @@ interface SymbolConstructor {
       * A method that determines if a constructor object recognizes an object as one of the 
       * constructor’s instances. Called by the semantics of the instanceof operator. 
       */
-    hasInstance: Symbol;
+    hasInstance: symbol;
 
     /** 
       * A Boolean value that if true indicates that an object should flatten to its array elements
       * by Array.prototype.concat.
       */
-    isConcatSpreadable: Symbol;
+    isConcatSpreadable: symbol;
 
     /** 
       * A Boolean value that if true indicates that an object may be used as a regular expression. 
       */
-    isRegExp: Symbol;
+    isRegExp: symbol;
 
     /** 
       * A method that returns the default iterator for an object.Called by the semantics of the 
       * for-of statement. 
       */
-    iterator: Symbol;
+    iterator: symbol;
 
     /** 
       * A method that converts an object to a corresponding primitive value.Called by the ToPrimitive
       * abstract operation. 
       */
-    toPrimitive: Symbol;
+    toPrimitive: symbol;
 
     /** 
       * A String value that is used in the creation of the default string description of an object. 
       * Called by the built- in method Object.prototype.toString. 
       */
-    toStringTag: Symbol;
+    toStringTag: symbol;
 
     /** 
       * An Object whose own property names are property names that are excluded from the with 
       * environment bindings of the associated objects.
       */
-    unscopables: Symbol;
+    unscopables: symbol;
 }
 declare var Symbol: SymbolConstructor;
 
@@ -108,7 +108,7 @@ interface ObjectConstructor {
       * Returns an array of all symbol properties found directly on object o.
       * @param o Object to retrieve the symbols from.
       */
-    getOwnPropertySymbols(o: any): Symbol[];
+    getOwnPropertySymbols(o: any): symbol[];
 
     /**
       *  Returns true if the values are the same value, false otherwise.
@@ -230,7 +230,7 @@ interface ArrayLike<T> {
 
 interface Array<T> {
     /** Iterator */
-    // [Symbol.iterator] (): Iterator<T>;
+    [Symbol.iterator] (): Iterator<T>;
 
     /** 
       * Returns an array of key, value pairs for every entry in the array
@@ -329,7 +329,7 @@ interface ArrayConstructor {
 
 interface String {
     /** Iterator */
-    // [Symbol.iterator] (): Iterator<string>;
+    [Symbol.iterator] (): Iterator<string>;
 
     /**
       * Returns a nonnegative integer Number less than 1114112 (0x110000) that is the code point 
@@ -447,12 +447,12 @@ interface IteratorResult<T> {
 }
 
 interface Iterator<T> {
-    //[Symbol.iterator](): Iterator<T>;
+    [Symbol.iterator](): Iterator<T>;
     next(): IteratorResult<T>;
 }
 
 interface Iterable<T> {
-  //[Symbol.iterator](): Iterator<T>;
+    [Symbol.iterator](): Iterator<T>;
 }
 
 interface GeneratorFunction extends Function {
@@ -474,7 +474,7 @@ interface Generator<T> extends Iterator<T> {
     next(value?: any): IteratorResult<T>;
     throw (exception: any): IteratorResult<T>;
     return (value: T): IteratorResult<T>;
-    // [Symbol.toStringTag]: string;
+    [Symbol.toStringTag]: string;
 }
 
 interface Math {
@@ -588,11 +588,11 @@ interface Math {
       */
     cbrt(x: number): number;
 
-    // [Symbol.toStringTag]: string;
+    [Symbol.toStringTag]: string;
 }
 
 interface RegExp {
-    // [Symbol.isRegExp]: boolean;
+    [Symbol.isRegExp]: boolean;
 
     /** 
       * Matches a string with a regular expression, and returns an array containing the results of 
@@ -649,8 +649,8 @@ interface Map<K, V> {
     set(key: K, value?: V): Map<K, V>;
     size: number;
     values(): Iterator<V>;
-    // [Symbol.iterator]():Iterator<[K,V]>;
-    // [Symbol.toStringTag]: string;
+    [Symbol.iterator]():Iterator<[K,V]>;
+    [Symbol.toStringTag]: string;
 }
 
 interface MapConstructor {
@@ -666,7 +666,7 @@ interface WeakMap<K, V> {
     get(key: K): V;
     has(key: K): boolean;
     set(key: K, value?: V): WeakMap<K, V>;
-    // [Symbol.toStringTag]: string;
+    [Symbol.toStringTag]: string;
 }
 
 interface WeakMapConstructor {
@@ -686,8 +686,8 @@ interface Set<T> {
     keys(): Iterator<T>;
     size: number;
     values(): Iterator<T>;
-    // [Symbol.iterator]():Iterator<T>;
-    // [Symbol.toStringTag]: string;
+    [Symbol.iterator]():Iterator<T>;
+    [Symbol.toStringTag]: string;
 }
 
 interface SetConstructor {
@@ -702,7 +702,7 @@ interface WeakSet<T> {
     clear(): void;
     delete(value: T): boolean;
     has(value: T): boolean;
-    // [Symbol.toStringTag]: string;
+    [Symbol.toStringTag]: string;
 }
 
 interface WeakSetConstructor {
@@ -713,7 +713,7 @@ interface WeakSetConstructor {
 declare var WeakSet: WeakSetConstructor;
 
 interface JSON {
-    // [Symbol.toStringTag]: string;
+    [Symbol.toStringTag]: string;
 }
 
 /**
@@ -733,7 +733,7 @@ interface ArrayBuffer {
       */
     slice(begin: number, end?: number): ArrayBuffer;
 
-    // [Symbol.toStringTag]: string;
+    [Symbol.toStringTag]: string;
 }
 
 interface ArrayBufferConstructor {
@@ -870,7 +870,7 @@ interface DataView {
       */
     setUint32(byteOffset: number, value: number, littleEndian: boolean): void;
 
-    // [Symbol.toStringTag]: string;
+    [Symbol.toStringTag]: string;
 }
 
 interface DataViewConstructor {
@@ -1137,7 +1137,7 @@ interface Int8Array {
     values(): Iterator<number>;
 
     [index: number]: number;
-    // [Symbol.iterator] (): Iterator<number>;
+    [Symbol.iterator] (): Iterator<number>;
 }
 
 interface Int8ArrayConstructor {
@@ -1427,7 +1427,7 @@ interface Uint8Array {
     values(): Iterator<number>;
 
     [index: number]: number;
-    // [Symbol.iterator] (): Iterator<number>;
+    [Symbol.iterator] (): Iterator<number>;
 }
 
 interface Uint8ArrayConstructor {
@@ -1717,7 +1717,7 @@ interface Uint8ClampedArray {
     values(): Iterator<number>;
 
     [index: number]: number;
-    // [Symbol.iterator] (): Iterator<number>;
+    [Symbol.iterator] (): Iterator<number>;
 }
 
 interface Uint8ClampedArrayConstructor {
@@ -2007,7 +2007,7 @@ interface Int16Array {
     values(): Iterator<number>;
 
     [index: number]: number;
-    // [Symbol.iterator] (): Iterator<number>;
+    [Symbol.iterator] (): Iterator<number>;
 }
 
 interface Int16ArrayConstructor {
@@ -2297,7 +2297,7 @@ interface Uint16Array {
     values(): Iterator<number>;
 
     [index: number]: number;
-    // [Symbol.iterator] (): Iterator<number>;
+    [Symbol.iterator] (): Iterator<number>;
 }
 
 interface Uint16ArrayConstructor {
@@ -2587,7 +2587,7 @@ interface Int32Array {
     values(): Iterator<number>;
 
     [index: number]: number;
-    // [Symbol.iterator] (): Iterator<number>;
+    [Symbol.iterator] (): Iterator<number>;
 }
 
 interface Int32ArrayConstructor {
@@ -2877,7 +2877,7 @@ interface Uint32Array {
     values(): Iterator<number>;
 
     [index: number]: number;
-    // [Symbol.iterator] (): Iterator<number>;
+    [Symbol.iterator] (): Iterator<number>;
 }
 
 interface Uint32ArrayConstructor {
@@ -3167,7 +3167,7 @@ interface Float32Array {
     values(): Iterator<number>;
 
     [index: number]: number;
-    // [Symbol.iterator] (): Iterator<number>;
+    [Symbol.iterator] (): Iterator<number>;
 }
 
 interface Float32ArrayConstructor {
@@ -3457,7 +3457,7 @@ interface Float64Array {
     values(): Iterator<number>;
 
     [index: number]: number;
-    // [Symbol.iterator] (): Iterator<number>;
+    [Symbol.iterator] (): Iterator<number>;
 }
 
 interface Float64ArrayConstructor {
@@ -3521,7 +3521,7 @@ declare var Reflect: {
     getOwnPropertyDescriptor(target: any, propertyKey: PropertyKey): PropertyDescriptor;
     getPrototypeOf(target: any): any;
     has(target: any, propertyKey: string): boolean;
-    has(target: any, propertyKey: Symbol): boolean;
+    has(target: any, propertyKey: symbol): boolean;
     isExtensible(target: any): boolean;
     ownKeys(target: any): Array<PropertyKey>;
     preventExtensions(target: any): boolean;
diff --git a/src/services/formatting/tokenRange.ts b/src/services/formatting/tokenRange.ts
index 61fcb26dc9be2..6dace543eab3b 100644
--- a/src/services/formatting/tokenRange.ts
+++ b/src/services/formatting/tokenRange.ts
@@ -134,7 +134,7 @@ module ts.formatting {
             static UnaryPredecrementExpressions = TokenRange.FromTokens([SyntaxKind.Identifier, SyntaxKind.OpenParenToken, SyntaxKind.ThisKeyword, SyntaxKind.NewKeyword]);
             static UnaryPostdecrementExpressions = TokenRange.FromTokens([SyntaxKind.Identifier, SyntaxKind.CloseParenToken, SyntaxKind.CloseBracketToken, SyntaxKind.NewKeyword]);
             static Comments = TokenRange.FromTokens([SyntaxKind.SingleLineCommentTrivia, SyntaxKind.MultiLineCommentTrivia]);
-            static TypeNames = TokenRange.FromTokens([SyntaxKind.Identifier, SyntaxKind.NumberKeyword, SyntaxKind.StringKeyword, SyntaxKind.BooleanKeyword, SyntaxKind.VoidKeyword, SyntaxKind.AnyKeyword]);
+            static TypeNames = TokenRange.FromTokens([SyntaxKind.Identifier, SyntaxKind.NumberKeyword, SyntaxKind.StringKeyword, SyntaxKind.BooleanKeyword, SyntaxKind.SymbolKeyword, SyntaxKind.VoidKeyword, SyntaxKind.AnyKeyword]);
         }
     }
 }
\ No newline at end of file
diff --git a/src/services/navigationBar.ts b/src/services/navigationBar.ts
index 771fe48219f1c..b254397f8b0cc 100644
--- a/src/services/navigationBar.ts
+++ b/src/services/navigationBar.ts
@@ -97,8 +97,7 @@ module ts.NavigationBar {
         function sortNodes(nodes: Node[]): Node[] {
             return nodes.slice(0).sort((n1: Declaration, n2: Declaration) => {
                 if (n1.name && n2.name) {
-                    // TODO(jfreeman): How do we sort declarations with computed names?
-                    return (<Identifier>n1.name).text.localeCompare((<Identifier>n2.name).text);
+                    return getPropertyNameForPropertyNameNode(n1.name).localeCompare(getPropertyNameForPropertyNameNode(n2.name));
                 }
                 else if (n1.name) {
                     return 1;
@@ -426,7 +425,7 @@ module ts.NavigationBar {
                     // Add the constructor parameters in as children of the class (for property parameters).
                     // Note that *all* parameters will be added to the nodes array, but parameters that
                     // are not properties will be filtered out later by createChildItem.
-                    var nodes: Node[] = removeComputedProperties(node);
+                    var nodes: Node[] = removeDynamicallyNamedProperties(node);
                     if (constructor) {
                         nodes.push.apply(nodes, constructor.parameters);
                     }
@@ -455,7 +454,7 @@ module ts.NavigationBar {
             }
 
             function createIterfaceItem(node: InterfaceDeclaration): ts.NavigationBarItem {
-                var childItems = getItemsWorker(sortNodes(removeComputedProperties(node)), createChildItem);
+                var childItems = getItemsWorker(sortNodes(removeDynamicallyNamedProperties(node)), createChildItem);
                 return getNavigationBarItem(
                     node.name.text,
                     ts.ScriptElementKind.interfaceElement,
@@ -466,10 +465,17 @@ module ts.NavigationBar {
             }
         }
 
-        function removeComputedProperties(node: ClassDeclaration | InterfaceDeclaration | EnumDeclaration): Declaration[] {
+        function removeComputedProperties(node: EnumDeclaration): Declaration[] {
             return filter<Declaration>(node.members, member => member.name === undefined || member.name.kind !== SyntaxKind.ComputedPropertyName);
         }
 
+        /**
+         * Like removeComputedProperties, but retains the properties with well known symbol names
+         */
+        function removeDynamicallyNamedProperties(node: ClassDeclaration | InterfaceDeclaration): Declaration[]{
+            return filter<Declaration>(node.members, member => !hasDynamicName(member));
+        }
+
         function getInnermostModule(node: ModuleDeclaration): ModuleDeclaration {
             while (node.body.kind === SyntaxKind.ModuleDeclaration) {
                 node = <ModuleDeclaration>node.body;
diff --git a/src/services/services.ts b/src/services/services.ts
index 767d1a7f09974..b4d539843073c 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -5797,7 +5797,8 @@ module ts {
                     else if (token === SyntaxKind.AnyKeyword ||
                              token === SyntaxKind.StringKeyword ||
                              token === SyntaxKind.NumberKeyword ||
-                             token === SyntaxKind.BooleanKeyword) {
+                             token === SyntaxKind.BooleanKeyword ||
+                             token === SyntaxKind.SymbolKeyword) {
                         if (angleBracketStack > 0 && !syntacticClassifierAbsent) {
                             // If it looks like we're could be in something generic, don't classify this 
                             // as a keyword.  We may just get overwritten by the syntactic classifier,
diff --git a/tests/baselines/reference/APISample_compile.js b/tests/baselines/reference/APISample_compile.js
index b91a706aa4519..8afa0a5b939cb 100644
--- a/tests/baselines/reference/APISample_compile.js
+++ b/tests/baselines/reference/APISample_compile.js
@@ -179,110 +179,111 @@ declare module "typescript" {
         NumberKeyword = 117,
         SetKeyword = 118,
         StringKeyword = 119,
-        TypeKeyword = 120,
-        QualifiedName = 121,
-        ComputedPropertyName = 122,
-        TypeParameter = 123,
-        Parameter = 124,
-        PropertySignature = 125,
-        PropertyDeclaration = 126,
-        MethodSignature = 127,
-        MethodDeclaration = 128,
-        Constructor = 129,
-        GetAccessor = 130,
-        SetAccessor = 131,
-        CallSignature = 132,
-        ConstructSignature = 133,
-        IndexSignature = 134,
-        TypeReference = 135,
-        FunctionType = 136,
-        ConstructorType = 137,
-        TypeQuery = 138,
-        TypeLiteral = 139,
-        ArrayType = 140,
-        TupleType = 141,
-        UnionType = 142,
-        ParenthesizedType = 143,
-        ObjectBindingPattern = 144,
-        ArrayBindingPattern = 145,
-        BindingElement = 146,
-        ArrayLiteralExpression = 147,
-        ObjectLiteralExpression = 148,
-        PropertyAccessExpression = 149,
-        ElementAccessExpression = 150,
-        CallExpression = 151,
-        NewExpression = 152,
-        TaggedTemplateExpression = 153,
-        TypeAssertionExpression = 154,
-        ParenthesizedExpression = 155,
-        FunctionExpression = 156,
-        ArrowFunction = 157,
-        DeleteExpression = 158,
-        TypeOfExpression = 159,
-        VoidExpression = 160,
-        PrefixUnaryExpression = 161,
-        PostfixUnaryExpression = 162,
-        BinaryExpression = 163,
-        ConditionalExpression = 164,
-        TemplateExpression = 165,
-        YieldExpression = 166,
-        SpreadElementExpression = 167,
-        OmittedExpression = 168,
-        TemplateSpan = 169,
-        Block = 170,
-        VariableStatement = 171,
-        EmptyStatement = 172,
-        ExpressionStatement = 173,
-        IfStatement = 174,
-        DoStatement = 175,
-        WhileStatement = 176,
-        ForStatement = 177,
-        ForInStatement = 178,
-        ContinueStatement = 179,
-        BreakStatement = 180,
-        ReturnStatement = 181,
-        WithStatement = 182,
-        SwitchStatement = 183,
-        LabeledStatement = 184,
-        ThrowStatement = 185,
-        TryStatement = 186,
-        DebuggerStatement = 187,
-        VariableDeclaration = 188,
-        VariableDeclarationList = 189,
-        FunctionDeclaration = 190,
-        ClassDeclaration = 191,
-        InterfaceDeclaration = 192,
-        TypeAliasDeclaration = 193,
-        EnumDeclaration = 194,
-        ModuleDeclaration = 195,
-        ModuleBlock = 196,
-        ImportDeclaration = 197,
-        ExportAssignment = 198,
-        ExternalModuleReference = 199,
-        CaseClause = 200,
-        DefaultClause = 201,
-        HeritageClause = 202,
-        CatchClause = 203,
-        PropertyAssignment = 204,
-        ShorthandPropertyAssignment = 205,
-        EnumMember = 206,
-        SourceFile = 207,
-        SyntaxList = 208,
-        Count = 209,
+        SymbolKeyword = 120,
+        TypeKeyword = 121,
+        QualifiedName = 122,
+        ComputedPropertyName = 123,
+        TypeParameter = 124,
+        Parameter = 125,
+        PropertySignature = 126,
+        PropertyDeclaration = 127,
+        MethodSignature = 128,
+        MethodDeclaration = 129,
+        Constructor = 130,
+        GetAccessor = 131,
+        SetAccessor = 132,
+        CallSignature = 133,
+        ConstructSignature = 134,
+        IndexSignature = 135,
+        TypeReference = 136,
+        FunctionType = 137,
+        ConstructorType = 138,
+        TypeQuery = 139,
+        TypeLiteral = 140,
+        ArrayType = 141,
+        TupleType = 142,
+        UnionType = 143,
+        ParenthesizedType = 144,
+        ObjectBindingPattern = 145,
+        ArrayBindingPattern = 146,
+        BindingElement = 147,
+        ArrayLiteralExpression = 148,
+        ObjectLiteralExpression = 149,
+        PropertyAccessExpression = 150,
+        ElementAccessExpression = 151,
+        CallExpression = 152,
+        NewExpression = 153,
+        TaggedTemplateExpression = 154,
+        TypeAssertionExpression = 155,
+        ParenthesizedExpression = 156,
+        FunctionExpression = 157,
+        ArrowFunction = 158,
+        DeleteExpression = 159,
+        TypeOfExpression = 160,
+        VoidExpression = 161,
+        PrefixUnaryExpression = 162,
+        PostfixUnaryExpression = 163,
+        BinaryExpression = 164,
+        ConditionalExpression = 165,
+        TemplateExpression = 166,
+        YieldExpression = 167,
+        SpreadElementExpression = 168,
+        OmittedExpression = 169,
+        TemplateSpan = 170,
+        Block = 171,
+        VariableStatement = 172,
+        EmptyStatement = 173,
+        ExpressionStatement = 174,
+        IfStatement = 175,
+        DoStatement = 176,
+        WhileStatement = 177,
+        ForStatement = 178,
+        ForInStatement = 179,
+        ContinueStatement = 180,
+        BreakStatement = 181,
+        ReturnStatement = 182,
+        WithStatement = 183,
+        SwitchStatement = 184,
+        LabeledStatement = 185,
+        ThrowStatement = 186,
+        TryStatement = 187,
+        DebuggerStatement = 188,
+        VariableDeclaration = 189,
+        VariableDeclarationList = 190,
+        FunctionDeclaration = 191,
+        ClassDeclaration = 192,
+        InterfaceDeclaration = 193,
+        TypeAliasDeclaration = 194,
+        EnumDeclaration = 195,
+        ModuleDeclaration = 196,
+        ModuleBlock = 197,
+        ImportDeclaration = 198,
+        ExportAssignment = 199,
+        ExternalModuleReference = 200,
+        CaseClause = 201,
+        DefaultClause = 202,
+        HeritageClause = 203,
+        CatchClause = 204,
+        PropertyAssignment = 205,
+        ShorthandPropertyAssignment = 206,
+        EnumMember = 207,
+        SourceFile = 208,
+        SyntaxList = 209,
+        Count = 210,
         FirstAssignment = 52,
         LastAssignment = 63,
         FirstReservedWord = 65,
         LastReservedWord = 100,
         FirstKeyword = 65,
-        LastKeyword = 120,
+        LastKeyword = 121,
         FirstFutureReservedWord = 101,
         LastFutureReservedWord = 109,
-        FirstTypeNode = 135,
-        LastTypeNode = 143,
+        FirstTypeNode = 136,
+        LastTypeNode = 144,
         FirstPunctuation = 14,
         LastPunctuation = 63,
         FirstToken = 0,
-        LastToken = 120,
+        LastToken = 121,
         FirstTriviaToken = 2,
         LastTriviaToken = 6,
         FirstLiteralToken = 7,
@@ -291,7 +292,7 @@ declare module "typescript" {
         LastTemplateToken = 13,
         FirstBinaryOperator = 24,
         LastBinaryOperator = 63,
-        FirstNode = 121,
+        FirstNode = 122,
     }
     const enum NodeFlags {
         Export = 1,
@@ -1031,8 +1032,9 @@ declare module "typescript" {
         ObjectLiteral = 131072,
         ContainsUndefinedOrNull = 262144,
         ContainsObjectLiteral = 524288,
-        Intrinsic = 127,
-        Primitive = 510,
+        ESSymbol = 1048576,
+        Intrinsic = 1048703,
+        Primitive = 1049086,
         StringLike = 258,
         NumberLike = 132,
         ObjectType = 48128,
diff --git a/tests/baselines/reference/APISample_compile.types b/tests/baselines/reference/APISample_compile.types
index ae53c66680708..e2ccc04a7c319 100644
--- a/tests/baselines/reference/APISample_compile.types
+++ b/tests/baselines/reference/APISample_compile.types
@@ -553,274 +553,277 @@ declare module "typescript" {
         StringKeyword = 119,

 >StringKeyword : SyntaxKind
 
-        TypeKeyword = 120,

+        SymbolKeyword = 120,

+>SymbolKeyword : SyntaxKind
+
+        TypeKeyword = 121,

 >TypeKeyword : SyntaxKind
 
-        QualifiedName = 121,

+        QualifiedName = 122,

 >QualifiedName : SyntaxKind
 
-        ComputedPropertyName = 122,

+        ComputedPropertyName = 123,

 >ComputedPropertyName : SyntaxKind
 
-        TypeParameter = 123,

+        TypeParameter = 124,

 >TypeParameter : SyntaxKind
 
-        Parameter = 124,

+        Parameter = 125,

 >Parameter : SyntaxKind
 
-        PropertySignature = 125,

+        PropertySignature = 126,

 >PropertySignature : SyntaxKind
 
-        PropertyDeclaration = 126,

+        PropertyDeclaration = 127,

 >PropertyDeclaration : SyntaxKind
 
-        MethodSignature = 127,

+        MethodSignature = 128,

 >MethodSignature : SyntaxKind
 
-        MethodDeclaration = 128,

+        MethodDeclaration = 129,

 >MethodDeclaration : SyntaxKind
 
-        Constructor = 129,

+        Constructor = 130,

 >Constructor : SyntaxKind
 
-        GetAccessor = 130,

+        GetAccessor = 131,

 >GetAccessor : SyntaxKind
 
-        SetAccessor = 131,

+        SetAccessor = 132,

 >SetAccessor : SyntaxKind
 
-        CallSignature = 132,

+        CallSignature = 133,

 >CallSignature : SyntaxKind
 
-        ConstructSignature = 133,

+        ConstructSignature = 134,

 >ConstructSignature : SyntaxKind
 
-        IndexSignature = 134,

+        IndexSignature = 135,

 >IndexSignature : SyntaxKind
 
-        TypeReference = 135,

+        TypeReference = 136,

 >TypeReference : SyntaxKind
 
-        FunctionType = 136,

+        FunctionType = 137,

 >FunctionType : SyntaxKind
 
-        ConstructorType = 137,

+        ConstructorType = 138,

 >ConstructorType : SyntaxKind
 
-        TypeQuery = 138,

+        TypeQuery = 139,

 >TypeQuery : SyntaxKind
 
-        TypeLiteral = 139,

+        TypeLiteral = 140,

 >TypeLiteral : SyntaxKind
 
-        ArrayType = 140,

+        ArrayType = 141,

 >ArrayType : SyntaxKind
 
-        TupleType = 141,

+        TupleType = 142,

 >TupleType : SyntaxKind
 
-        UnionType = 142,

+        UnionType = 143,

 >UnionType : SyntaxKind
 
-        ParenthesizedType = 143,

+        ParenthesizedType = 144,

 >ParenthesizedType : SyntaxKind
 
-        ObjectBindingPattern = 144,

+        ObjectBindingPattern = 145,

 >ObjectBindingPattern : SyntaxKind
 
-        ArrayBindingPattern = 145,

+        ArrayBindingPattern = 146,

 >ArrayBindingPattern : SyntaxKind
 
-        BindingElement = 146,

+        BindingElement = 147,

 >BindingElement : SyntaxKind
 
-        ArrayLiteralExpression = 147,

+        ArrayLiteralExpression = 148,

 >ArrayLiteralExpression : SyntaxKind
 
-        ObjectLiteralExpression = 148,

+        ObjectLiteralExpression = 149,

 >ObjectLiteralExpression : SyntaxKind
 
-        PropertyAccessExpression = 149,

+        PropertyAccessExpression = 150,

 >PropertyAccessExpression : SyntaxKind
 
-        ElementAccessExpression = 150,

+        ElementAccessExpression = 151,

 >ElementAccessExpression : SyntaxKind
 
-        CallExpression = 151,

+        CallExpression = 152,

 >CallExpression : SyntaxKind
 
-        NewExpression = 152,

+        NewExpression = 153,

 >NewExpression : SyntaxKind
 
-        TaggedTemplateExpression = 153,

+        TaggedTemplateExpression = 154,

 >TaggedTemplateExpression : SyntaxKind
 
-        TypeAssertionExpression = 154,

+        TypeAssertionExpression = 155,

 >TypeAssertionExpression : SyntaxKind
 
-        ParenthesizedExpression = 155,

+        ParenthesizedExpression = 156,

 >ParenthesizedExpression : SyntaxKind
 
-        FunctionExpression = 156,

+        FunctionExpression = 157,

 >FunctionExpression : SyntaxKind
 
-        ArrowFunction = 157,

+        ArrowFunction = 158,

 >ArrowFunction : SyntaxKind
 
-        DeleteExpression = 158,

+        DeleteExpression = 159,

 >DeleteExpression : SyntaxKind
 
-        TypeOfExpression = 159,

+        TypeOfExpression = 160,

 >TypeOfExpression : SyntaxKind
 
-        VoidExpression = 160,

+        VoidExpression = 161,

 >VoidExpression : SyntaxKind
 
-        PrefixUnaryExpression = 161,

+        PrefixUnaryExpression = 162,

 >PrefixUnaryExpression : SyntaxKind
 
-        PostfixUnaryExpression = 162,

+        PostfixUnaryExpression = 163,

 >PostfixUnaryExpression : SyntaxKind
 
-        BinaryExpression = 163,

+        BinaryExpression = 164,

 >BinaryExpression : SyntaxKind
 
-        ConditionalExpression = 164,

+        ConditionalExpression = 165,

 >ConditionalExpression : SyntaxKind
 
-        TemplateExpression = 165,

+        TemplateExpression = 166,

 >TemplateExpression : SyntaxKind
 
-        YieldExpression = 166,

+        YieldExpression = 167,

 >YieldExpression : SyntaxKind
 
-        SpreadElementExpression = 167,

+        SpreadElementExpression = 168,

 >SpreadElementExpression : SyntaxKind
 
-        OmittedExpression = 168,

+        OmittedExpression = 169,

 >OmittedExpression : SyntaxKind
 
-        TemplateSpan = 169,

+        TemplateSpan = 170,

 >TemplateSpan : SyntaxKind
 
-        Block = 170,

+        Block = 171,

 >Block : SyntaxKind
 
-        VariableStatement = 171,

+        VariableStatement = 172,

 >VariableStatement : SyntaxKind
 
-        EmptyStatement = 172,

+        EmptyStatement = 173,

 >EmptyStatement : SyntaxKind
 
-        ExpressionStatement = 173,

+        ExpressionStatement = 174,

 >ExpressionStatement : SyntaxKind
 
-        IfStatement = 174,

+        IfStatement = 175,

 >IfStatement : SyntaxKind
 
-        DoStatement = 175,

+        DoStatement = 176,

 >DoStatement : SyntaxKind
 
-        WhileStatement = 176,

+        WhileStatement = 177,

 >WhileStatement : SyntaxKind
 
-        ForStatement = 177,

+        ForStatement = 178,

 >ForStatement : SyntaxKind
 
-        ForInStatement = 178,

+        ForInStatement = 179,

 >ForInStatement : SyntaxKind
 
-        ContinueStatement = 179,

+        ContinueStatement = 180,

 >ContinueStatement : SyntaxKind
 
-        BreakStatement = 180,

+        BreakStatement = 181,

 >BreakStatement : SyntaxKind
 
-        ReturnStatement = 181,

+        ReturnStatement = 182,

 >ReturnStatement : SyntaxKind
 
-        WithStatement = 182,

+        WithStatement = 183,

 >WithStatement : SyntaxKind
 
-        SwitchStatement = 183,

+        SwitchStatement = 184,

 >SwitchStatement : SyntaxKind
 
-        LabeledStatement = 184,

+        LabeledStatement = 185,

 >LabeledStatement : SyntaxKind
 
-        ThrowStatement = 185,

+        ThrowStatement = 186,

 >ThrowStatement : SyntaxKind
 
-        TryStatement = 186,

+        TryStatement = 187,

 >TryStatement : SyntaxKind
 
-        DebuggerStatement = 187,

+        DebuggerStatement = 188,

 >DebuggerStatement : SyntaxKind
 
-        VariableDeclaration = 188,

+        VariableDeclaration = 189,

 >VariableDeclaration : SyntaxKind
 
-        VariableDeclarationList = 189,

+        VariableDeclarationList = 190,

 >VariableDeclarationList : SyntaxKind
 
-        FunctionDeclaration = 190,

+        FunctionDeclaration = 191,

 >FunctionDeclaration : SyntaxKind
 
-        ClassDeclaration = 191,

+        ClassDeclaration = 192,

 >ClassDeclaration : SyntaxKind
 
-        InterfaceDeclaration = 192,

+        InterfaceDeclaration = 193,

 >InterfaceDeclaration : SyntaxKind
 
-        TypeAliasDeclaration = 193,

+        TypeAliasDeclaration = 194,

 >TypeAliasDeclaration : SyntaxKind
 
-        EnumDeclaration = 194,

+        EnumDeclaration = 195,

 >EnumDeclaration : SyntaxKind
 
-        ModuleDeclaration = 195,

+        ModuleDeclaration = 196,

 >ModuleDeclaration : SyntaxKind
 
-        ModuleBlock = 196,

+        ModuleBlock = 197,

 >ModuleBlock : SyntaxKind
 
-        ImportDeclaration = 197,

+        ImportDeclaration = 198,

 >ImportDeclaration : SyntaxKind
 
-        ExportAssignment = 198,

+        ExportAssignment = 199,

 >ExportAssignment : SyntaxKind
 
-        ExternalModuleReference = 199,

+        ExternalModuleReference = 200,

 >ExternalModuleReference : SyntaxKind
 
-        CaseClause = 200,

+        CaseClause = 201,

 >CaseClause : SyntaxKind
 
-        DefaultClause = 201,

+        DefaultClause = 202,

 >DefaultClause : SyntaxKind
 
-        HeritageClause = 202,

+        HeritageClause = 203,

 >HeritageClause : SyntaxKind
 
-        CatchClause = 203,

+        CatchClause = 204,

 >CatchClause : SyntaxKind
 
-        PropertyAssignment = 204,

+        PropertyAssignment = 205,

 >PropertyAssignment : SyntaxKind
 
-        ShorthandPropertyAssignment = 205,

+        ShorthandPropertyAssignment = 206,

 >ShorthandPropertyAssignment : SyntaxKind
 
-        EnumMember = 206,

+        EnumMember = 207,

 >EnumMember : SyntaxKind
 
-        SourceFile = 207,

+        SourceFile = 208,

 >SourceFile : SyntaxKind
 
-        SyntaxList = 208,

+        SyntaxList = 209,

 >SyntaxList : SyntaxKind
 
-        Count = 209,

+        Count = 210,

 >Count : SyntaxKind
 
         FirstAssignment = 52,

@@ -838,7 +841,7 @@ declare module "typescript" {
         FirstKeyword = 65,

 >FirstKeyword : SyntaxKind
 
-        LastKeyword = 120,

+        LastKeyword = 121,

 >LastKeyword : SyntaxKind
 
         FirstFutureReservedWord = 101,

@@ -847,10 +850,10 @@ declare module "typescript" {
         LastFutureReservedWord = 109,

 >LastFutureReservedWord : SyntaxKind
 
-        FirstTypeNode = 135,

+        FirstTypeNode = 136,

 >FirstTypeNode : SyntaxKind
 
-        LastTypeNode = 143,

+        LastTypeNode = 144,

 >LastTypeNode : SyntaxKind
 
         FirstPunctuation = 14,

@@ -862,7 +865,7 @@ declare module "typescript" {
         FirstToken = 0,

 >FirstToken : SyntaxKind
 
-        LastToken = 120,

+        LastToken = 121,

 >LastToken : SyntaxKind
 
         FirstTriviaToken = 2,

@@ -889,7 +892,7 @@ declare module "typescript" {
         LastBinaryOperator = 63,

 >LastBinaryOperator : SyntaxKind
 
-        FirstNode = 121,

+        FirstNode = 122,

 >FirstNode : SyntaxKind
     }

     const enum NodeFlags {

@@ -3318,10 +3321,13 @@ declare module "typescript" {
         ContainsObjectLiteral = 524288,

 >ContainsObjectLiteral : TypeFlags
 
-        Intrinsic = 127,

+        ESSymbol = 1048576,

+>ESSymbol : TypeFlags
+
+        Intrinsic = 1048703,

 >Intrinsic : TypeFlags
 
-        Primitive = 510,

+        Primitive = 1049086,

 >Primitive : TypeFlags
 
         StringLike = 258,

diff --git a/tests/baselines/reference/APISample_linter.js b/tests/baselines/reference/APISample_linter.js
index 68c13edb7dbca..74ec089e0d07e 100644
--- a/tests/baselines/reference/APISample_linter.js
+++ b/tests/baselines/reference/APISample_linter.js
@@ -210,110 +210,111 @@ declare module "typescript" {
         NumberKeyword = 117,
         SetKeyword = 118,
         StringKeyword = 119,
-        TypeKeyword = 120,
-        QualifiedName = 121,
-        ComputedPropertyName = 122,
-        TypeParameter = 123,
-        Parameter = 124,
-        PropertySignature = 125,
-        PropertyDeclaration = 126,
-        MethodSignature = 127,
-        MethodDeclaration = 128,
-        Constructor = 129,
-        GetAccessor = 130,
-        SetAccessor = 131,
-        CallSignature = 132,
-        ConstructSignature = 133,
-        IndexSignature = 134,
-        TypeReference = 135,
-        FunctionType = 136,
-        ConstructorType = 137,
-        TypeQuery = 138,
-        TypeLiteral = 139,
-        ArrayType = 140,
-        TupleType = 141,
-        UnionType = 142,
-        ParenthesizedType = 143,
-        ObjectBindingPattern = 144,
-        ArrayBindingPattern = 145,
-        BindingElement = 146,
-        ArrayLiteralExpression = 147,
-        ObjectLiteralExpression = 148,
-        PropertyAccessExpression = 149,
-        ElementAccessExpression = 150,
-        CallExpression = 151,
-        NewExpression = 152,
-        TaggedTemplateExpression = 153,
-        TypeAssertionExpression = 154,
-        ParenthesizedExpression = 155,
-        FunctionExpression = 156,
-        ArrowFunction = 157,
-        DeleteExpression = 158,
-        TypeOfExpression = 159,
-        VoidExpression = 160,
-        PrefixUnaryExpression = 161,
-        PostfixUnaryExpression = 162,
-        BinaryExpression = 163,
-        ConditionalExpression = 164,
-        TemplateExpression = 165,
-        YieldExpression = 166,
-        SpreadElementExpression = 167,
-        OmittedExpression = 168,
-        TemplateSpan = 169,
-        Block = 170,
-        VariableStatement = 171,
-        EmptyStatement = 172,
-        ExpressionStatement = 173,
-        IfStatement = 174,
-        DoStatement = 175,
-        WhileStatement = 176,
-        ForStatement = 177,
-        ForInStatement = 178,
-        ContinueStatement = 179,
-        BreakStatement = 180,
-        ReturnStatement = 181,
-        WithStatement = 182,
-        SwitchStatement = 183,
-        LabeledStatement = 184,
-        ThrowStatement = 185,
-        TryStatement = 186,
-        DebuggerStatement = 187,
-        VariableDeclaration = 188,
-        VariableDeclarationList = 189,
-        FunctionDeclaration = 190,
-        ClassDeclaration = 191,
-        InterfaceDeclaration = 192,
-        TypeAliasDeclaration = 193,
-        EnumDeclaration = 194,
-        ModuleDeclaration = 195,
-        ModuleBlock = 196,
-        ImportDeclaration = 197,
-        ExportAssignment = 198,
-        ExternalModuleReference = 199,
-        CaseClause = 200,
-        DefaultClause = 201,
-        HeritageClause = 202,
-        CatchClause = 203,
-        PropertyAssignment = 204,
-        ShorthandPropertyAssignment = 205,
-        EnumMember = 206,
-        SourceFile = 207,
-        SyntaxList = 208,
-        Count = 209,
+        SymbolKeyword = 120,
+        TypeKeyword = 121,
+        QualifiedName = 122,
+        ComputedPropertyName = 123,
+        TypeParameter = 124,
+        Parameter = 125,
+        PropertySignature = 126,
+        PropertyDeclaration = 127,
+        MethodSignature = 128,
+        MethodDeclaration = 129,
+        Constructor = 130,
+        GetAccessor = 131,
+        SetAccessor = 132,
+        CallSignature = 133,
+        ConstructSignature = 134,
+        IndexSignature = 135,
+        TypeReference = 136,
+        FunctionType = 137,
+        ConstructorType = 138,
+        TypeQuery = 139,
+        TypeLiteral = 140,
+        ArrayType = 141,
+        TupleType = 142,
+        UnionType = 143,
+        ParenthesizedType = 144,
+        ObjectBindingPattern = 145,
+        ArrayBindingPattern = 146,
+        BindingElement = 147,
+        ArrayLiteralExpression = 148,
+        ObjectLiteralExpression = 149,
+        PropertyAccessExpression = 150,
+        ElementAccessExpression = 151,
+        CallExpression = 152,
+        NewExpression = 153,
+        TaggedTemplateExpression = 154,
+        TypeAssertionExpression = 155,
+        ParenthesizedExpression = 156,
+        FunctionExpression = 157,
+        ArrowFunction = 158,
+        DeleteExpression = 159,
+        TypeOfExpression = 160,
+        VoidExpression = 161,
+        PrefixUnaryExpression = 162,
+        PostfixUnaryExpression = 163,
+        BinaryExpression = 164,
+        ConditionalExpression = 165,
+        TemplateExpression = 166,
+        YieldExpression = 167,
+        SpreadElementExpression = 168,
+        OmittedExpression = 169,
+        TemplateSpan = 170,
+        Block = 171,
+        VariableStatement = 172,
+        EmptyStatement = 173,
+        ExpressionStatement = 174,
+        IfStatement = 175,
+        DoStatement = 176,
+        WhileStatement = 177,
+        ForStatement = 178,
+        ForInStatement = 179,
+        ContinueStatement = 180,
+        BreakStatement = 181,
+        ReturnStatement = 182,
+        WithStatement = 183,
+        SwitchStatement = 184,
+        LabeledStatement = 185,
+        ThrowStatement = 186,
+        TryStatement = 187,
+        DebuggerStatement = 188,
+        VariableDeclaration = 189,
+        VariableDeclarationList = 190,
+        FunctionDeclaration = 191,
+        ClassDeclaration = 192,
+        InterfaceDeclaration = 193,
+        TypeAliasDeclaration = 194,
+        EnumDeclaration = 195,
+        ModuleDeclaration = 196,
+        ModuleBlock = 197,
+        ImportDeclaration = 198,
+        ExportAssignment = 199,
+        ExternalModuleReference = 200,
+        CaseClause = 201,
+        DefaultClause = 202,
+        HeritageClause = 203,
+        CatchClause = 204,
+        PropertyAssignment = 205,
+        ShorthandPropertyAssignment = 206,
+        EnumMember = 207,
+        SourceFile = 208,
+        SyntaxList = 209,
+        Count = 210,
         FirstAssignment = 52,
         LastAssignment = 63,
         FirstReservedWord = 65,
         LastReservedWord = 100,
         FirstKeyword = 65,
-        LastKeyword = 120,
+        LastKeyword = 121,
         FirstFutureReservedWord = 101,
         LastFutureReservedWord = 109,
-        FirstTypeNode = 135,
-        LastTypeNode = 143,
+        FirstTypeNode = 136,
+        LastTypeNode = 144,
         FirstPunctuation = 14,
         LastPunctuation = 63,
         FirstToken = 0,
-        LastToken = 120,
+        LastToken = 121,
         FirstTriviaToken = 2,
         LastTriviaToken = 6,
         FirstLiteralToken = 7,
@@ -322,7 +323,7 @@ declare module "typescript" {
         LastTemplateToken = 13,
         FirstBinaryOperator = 24,
         LastBinaryOperator = 63,
-        FirstNode = 121,
+        FirstNode = 122,
     }
     const enum NodeFlags {
         Export = 1,
@@ -1062,8 +1063,9 @@ declare module "typescript" {
         ObjectLiteral = 131072,
         ContainsUndefinedOrNull = 262144,
         ContainsObjectLiteral = 524288,
-        Intrinsic = 127,
-        Primitive = 510,
+        ESSymbol = 1048576,
+        Intrinsic = 1048703,
+        Primitive = 1049086,
         StringLike = 258,
         NumberLike = 132,
         ObjectType = 48128,
@@ -1976,24 +1978,24 @@ function delint(sourceFile) {
     delintNode(sourceFile);
     function delintNode(node) {
         switch (node.kind) {
-            case 177 /* ForStatement */:
-            case 178 /* ForInStatement */:
-            case 176 /* WhileStatement */:
-            case 175 /* DoStatement */:
-                if (node.statement.kind !== 170 /* Block */) {
+            case 178 /* ForStatement */:
+            case 179 /* ForInStatement */:
+            case 177 /* WhileStatement */:
+            case 176 /* DoStatement */:
+                if (node.statement.kind !== 171 /* Block */) {
                     report(node, "A looping statement's contents should be wrapped in a block body.");
                 }
                 break;
-            case 174 /* IfStatement */:
+            case 175 /* IfStatement */:
                 var ifStatement = node;
-                if (ifStatement.thenStatement.kind !== 170 /* Block */) {
+                if (ifStatement.thenStatement.kind !== 171 /* Block */) {
                     report(ifStatement.thenStatement, "An if statement's contents should be wrapped in a block body.");
                 }
-                if (ifStatement.elseStatement && ifStatement.elseStatement.kind !== 170 /* Block */ && ifStatement.elseStatement.kind !== 174 /* IfStatement */) {
+                if (ifStatement.elseStatement && ifStatement.elseStatement.kind !== 171 /* Block */ && ifStatement.elseStatement.kind !== 175 /* IfStatement */) {
                     report(ifStatement.elseStatement, "An else statement's contents should be wrapped in a block body.");
                 }
                 break;
-            case 163 /* BinaryExpression */:
+            case 164 /* BinaryExpression */:
                 var op = node.operator;
                 if (op === 28 /* EqualsEqualsToken */ || op === 29 /* ExclamationEqualsToken */) {
                     report(node, "Use '===' and '!=='.");
diff --git a/tests/baselines/reference/APISample_linter.types b/tests/baselines/reference/APISample_linter.types
index 0c153e7b1dc20..3e750b0314879 100644
--- a/tests/baselines/reference/APISample_linter.types
+++ b/tests/baselines/reference/APISample_linter.types
@@ -697,274 +697,277 @@ declare module "typescript" {
         StringKeyword = 119,

 >StringKeyword : SyntaxKind
 
-        TypeKeyword = 120,

+        SymbolKeyword = 120,

+>SymbolKeyword : SyntaxKind
+
+        TypeKeyword = 121,

 >TypeKeyword : SyntaxKind
 
-        QualifiedName = 121,

+        QualifiedName = 122,

 >QualifiedName : SyntaxKind
 
-        ComputedPropertyName = 122,

+        ComputedPropertyName = 123,

 >ComputedPropertyName : SyntaxKind
 
-        TypeParameter = 123,

+        TypeParameter = 124,

 >TypeParameter : SyntaxKind
 
-        Parameter = 124,

+        Parameter = 125,

 >Parameter : SyntaxKind
 
-        PropertySignature = 125,

+        PropertySignature = 126,

 >PropertySignature : SyntaxKind
 
-        PropertyDeclaration = 126,

+        PropertyDeclaration = 127,

 >PropertyDeclaration : SyntaxKind
 
-        MethodSignature = 127,

+        MethodSignature = 128,

 >MethodSignature : SyntaxKind
 
-        MethodDeclaration = 128,

+        MethodDeclaration = 129,

 >MethodDeclaration : SyntaxKind
 
-        Constructor = 129,

+        Constructor = 130,

 >Constructor : SyntaxKind
 
-        GetAccessor = 130,

+        GetAccessor = 131,

 >GetAccessor : SyntaxKind
 
-        SetAccessor = 131,

+        SetAccessor = 132,

 >SetAccessor : SyntaxKind
 
-        CallSignature = 132,

+        CallSignature = 133,

 >CallSignature : SyntaxKind
 
-        ConstructSignature = 133,

+        ConstructSignature = 134,

 >ConstructSignature : SyntaxKind
 
-        IndexSignature = 134,

+        IndexSignature = 135,

 >IndexSignature : SyntaxKind
 
-        TypeReference = 135,

+        TypeReference = 136,

 >TypeReference : SyntaxKind
 
-        FunctionType = 136,

+        FunctionType = 137,

 >FunctionType : SyntaxKind
 
-        ConstructorType = 137,

+        ConstructorType = 138,

 >ConstructorType : SyntaxKind
 
-        TypeQuery = 138,

+        TypeQuery = 139,

 >TypeQuery : SyntaxKind
 
-        TypeLiteral = 139,

+        TypeLiteral = 140,

 >TypeLiteral : SyntaxKind
 
-        ArrayType = 140,

+        ArrayType = 141,

 >ArrayType : SyntaxKind
 
-        TupleType = 141,

+        TupleType = 142,

 >TupleType : SyntaxKind
 
-        UnionType = 142,

+        UnionType = 143,

 >UnionType : SyntaxKind
 
-        ParenthesizedType = 143,

+        ParenthesizedType = 144,

 >ParenthesizedType : SyntaxKind
 
-        ObjectBindingPattern = 144,

+        ObjectBindingPattern = 145,

 >ObjectBindingPattern : SyntaxKind
 
-        ArrayBindingPattern = 145,

+        ArrayBindingPattern = 146,

 >ArrayBindingPattern : SyntaxKind
 
-        BindingElement = 146,

+        BindingElement = 147,

 >BindingElement : SyntaxKind
 
-        ArrayLiteralExpression = 147,

+        ArrayLiteralExpression = 148,

 >ArrayLiteralExpression : SyntaxKind
 
-        ObjectLiteralExpression = 148,

+        ObjectLiteralExpression = 149,

 >ObjectLiteralExpression : SyntaxKind
 
-        PropertyAccessExpression = 149,

+        PropertyAccessExpression = 150,

 >PropertyAccessExpression : SyntaxKind
 
-        ElementAccessExpression = 150,

+        ElementAccessExpression = 151,

 >ElementAccessExpression : SyntaxKind
 
-        CallExpression = 151,

+        CallExpression = 152,

 >CallExpression : SyntaxKind
 
-        NewExpression = 152,

+        NewExpression = 153,

 >NewExpression : SyntaxKind
 
-        TaggedTemplateExpression = 153,

+        TaggedTemplateExpression = 154,

 >TaggedTemplateExpression : SyntaxKind
 
-        TypeAssertionExpression = 154,

+        TypeAssertionExpression = 155,

 >TypeAssertionExpression : SyntaxKind
 
-        ParenthesizedExpression = 155,

+        ParenthesizedExpression = 156,

 >ParenthesizedExpression : SyntaxKind
 
-        FunctionExpression = 156,

+        FunctionExpression = 157,

 >FunctionExpression : SyntaxKind
 
-        ArrowFunction = 157,

+        ArrowFunction = 158,

 >ArrowFunction : SyntaxKind
 
-        DeleteExpression = 158,

+        DeleteExpression = 159,

 >DeleteExpression : SyntaxKind
 
-        TypeOfExpression = 159,

+        TypeOfExpression = 160,

 >TypeOfExpression : SyntaxKind
 
-        VoidExpression = 160,

+        VoidExpression = 161,

 >VoidExpression : SyntaxKind
 
-        PrefixUnaryExpression = 161,

+        PrefixUnaryExpression = 162,

 >PrefixUnaryExpression : SyntaxKind
 
-        PostfixUnaryExpression = 162,

+        PostfixUnaryExpression = 163,

 >PostfixUnaryExpression : SyntaxKind
 
-        BinaryExpression = 163,

+        BinaryExpression = 164,

 >BinaryExpression : SyntaxKind
 
-        ConditionalExpression = 164,

+        ConditionalExpression = 165,

 >ConditionalExpression : SyntaxKind
 
-        TemplateExpression = 165,

+        TemplateExpression = 166,

 >TemplateExpression : SyntaxKind
 
-        YieldExpression = 166,

+        YieldExpression = 167,

 >YieldExpression : SyntaxKind
 
-        SpreadElementExpression = 167,

+        SpreadElementExpression = 168,

 >SpreadElementExpression : SyntaxKind
 
-        OmittedExpression = 168,

+        OmittedExpression = 169,

 >OmittedExpression : SyntaxKind
 
-        TemplateSpan = 169,

+        TemplateSpan = 170,

 >TemplateSpan : SyntaxKind
 
-        Block = 170,

+        Block = 171,

 >Block : SyntaxKind
 
-        VariableStatement = 171,

+        VariableStatement = 172,

 >VariableStatement : SyntaxKind
 
-        EmptyStatement = 172,

+        EmptyStatement = 173,

 >EmptyStatement : SyntaxKind
 
-        ExpressionStatement = 173,

+        ExpressionStatement = 174,

 >ExpressionStatement : SyntaxKind
 
-        IfStatement = 174,

+        IfStatement = 175,

 >IfStatement : SyntaxKind
 
-        DoStatement = 175,

+        DoStatement = 176,

 >DoStatement : SyntaxKind
 
-        WhileStatement = 176,

+        WhileStatement = 177,

 >WhileStatement : SyntaxKind
 
-        ForStatement = 177,

+        ForStatement = 178,

 >ForStatement : SyntaxKind
 
-        ForInStatement = 178,

+        ForInStatement = 179,

 >ForInStatement : SyntaxKind
 
-        ContinueStatement = 179,

+        ContinueStatement = 180,

 >ContinueStatement : SyntaxKind
 
-        BreakStatement = 180,

+        BreakStatement = 181,

 >BreakStatement : SyntaxKind
 
-        ReturnStatement = 181,

+        ReturnStatement = 182,

 >ReturnStatement : SyntaxKind
 
-        WithStatement = 182,

+        WithStatement = 183,

 >WithStatement : SyntaxKind
 
-        SwitchStatement = 183,

+        SwitchStatement = 184,

 >SwitchStatement : SyntaxKind
 
-        LabeledStatement = 184,

+        LabeledStatement = 185,

 >LabeledStatement : SyntaxKind
 
-        ThrowStatement = 185,

+        ThrowStatement = 186,

 >ThrowStatement : SyntaxKind
 
-        TryStatement = 186,

+        TryStatement = 187,

 >TryStatement : SyntaxKind
 
-        DebuggerStatement = 187,

+        DebuggerStatement = 188,

 >DebuggerStatement : SyntaxKind
 
-        VariableDeclaration = 188,

+        VariableDeclaration = 189,

 >VariableDeclaration : SyntaxKind
 
-        VariableDeclarationList = 189,

+        VariableDeclarationList = 190,

 >VariableDeclarationList : SyntaxKind
 
-        FunctionDeclaration = 190,

+        FunctionDeclaration = 191,

 >FunctionDeclaration : SyntaxKind
 
-        ClassDeclaration = 191,

+        ClassDeclaration = 192,

 >ClassDeclaration : SyntaxKind
 
-        InterfaceDeclaration = 192,

+        InterfaceDeclaration = 193,

 >InterfaceDeclaration : SyntaxKind
 
-        TypeAliasDeclaration = 193,

+        TypeAliasDeclaration = 194,

 >TypeAliasDeclaration : SyntaxKind
 
-        EnumDeclaration = 194,

+        EnumDeclaration = 195,

 >EnumDeclaration : SyntaxKind
 
-        ModuleDeclaration = 195,

+        ModuleDeclaration = 196,

 >ModuleDeclaration : SyntaxKind
 
-        ModuleBlock = 196,

+        ModuleBlock = 197,

 >ModuleBlock : SyntaxKind
 
-        ImportDeclaration = 197,

+        ImportDeclaration = 198,

 >ImportDeclaration : SyntaxKind
 
-        ExportAssignment = 198,

+        ExportAssignment = 199,

 >ExportAssignment : SyntaxKind
 
-        ExternalModuleReference = 199,

+        ExternalModuleReference = 200,

 >ExternalModuleReference : SyntaxKind
 
-        CaseClause = 200,

+        CaseClause = 201,

 >CaseClause : SyntaxKind
 
-        DefaultClause = 201,

+        DefaultClause = 202,

 >DefaultClause : SyntaxKind
 
-        HeritageClause = 202,

+        HeritageClause = 203,

 >HeritageClause : SyntaxKind
 
-        CatchClause = 203,

+        CatchClause = 204,

 >CatchClause : SyntaxKind
 
-        PropertyAssignment = 204,

+        PropertyAssignment = 205,

 >PropertyAssignment : SyntaxKind
 
-        ShorthandPropertyAssignment = 205,

+        ShorthandPropertyAssignment = 206,

 >ShorthandPropertyAssignment : SyntaxKind
 
-        EnumMember = 206,

+        EnumMember = 207,

 >EnumMember : SyntaxKind
 
-        SourceFile = 207,

+        SourceFile = 208,

 >SourceFile : SyntaxKind
 
-        SyntaxList = 208,

+        SyntaxList = 209,

 >SyntaxList : SyntaxKind
 
-        Count = 209,

+        Count = 210,

 >Count : SyntaxKind
 
         FirstAssignment = 52,

@@ -982,7 +985,7 @@ declare module "typescript" {
         FirstKeyword = 65,

 >FirstKeyword : SyntaxKind
 
-        LastKeyword = 120,

+        LastKeyword = 121,

 >LastKeyword : SyntaxKind
 
         FirstFutureReservedWord = 101,

@@ -991,10 +994,10 @@ declare module "typescript" {
         LastFutureReservedWord = 109,

 >LastFutureReservedWord : SyntaxKind
 
-        FirstTypeNode = 135,

+        FirstTypeNode = 136,

 >FirstTypeNode : SyntaxKind
 
-        LastTypeNode = 143,

+        LastTypeNode = 144,

 >LastTypeNode : SyntaxKind
 
         FirstPunctuation = 14,

@@ -1006,7 +1009,7 @@ declare module "typescript" {
         FirstToken = 0,

 >FirstToken : SyntaxKind
 
-        LastToken = 120,

+        LastToken = 121,

 >LastToken : SyntaxKind
 
         FirstTriviaToken = 2,

@@ -1033,7 +1036,7 @@ declare module "typescript" {
         LastBinaryOperator = 63,

 >LastBinaryOperator : SyntaxKind
 
-        FirstNode = 121,

+        FirstNode = 122,

 >FirstNode : SyntaxKind
     }

     const enum NodeFlags {

@@ -3462,10 +3465,13 @@ declare module "typescript" {
         ContainsObjectLiteral = 524288,

 >ContainsObjectLiteral : TypeFlags
 
-        Intrinsic = 127,

+        ESSymbol = 1048576,

+>ESSymbol : TypeFlags
+
+        Intrinsic = 1048703,

 >Intrinsic : TypeFlags
 
-        Primitive = 510,

+        Primitive = 1049086,

 >Primitive : TypeFlags
 
         StringLike = 258,

diff --git a/tests/baselines/reference/APISample_transform.js b/tests/baselines/reference/APISample_transform.js
index 0e80f6b55b963..22f50173a4f59 100644
--- a/tests/baselines/reference/APISample_transform.js
+++ b/tests/baselines/reference/APISample_transform.js
@@ -211,110 +211,111 @@ declare module "typescript" {
         NumberKeyword = 117,
         SetKeyword = 118,
         StringKeyword = 119,
-        TypeKeyword = 120,
-        QualifiedName = 121,
-        ComputedPropertyName = 122,
-        TypeParameter = 123,
-        Parameter = 124,
-        PropertySignature = 125,
-        PropertyDeclaration = 126,
-        MethodSignature = 127,
-        MethodDeclaration = 128,
-        Constructor = 129,
-        GetAccessor = 130,
-        SetAccessor = 131,
-        CallSignature = 132,
-        ConstructSignature = 133,
-        IndexSignature = 134,
-        TypeReference = 135,
-        FunctionType = 136,
-        ConstructorType = 137,
-        TypeQuery = 138,
-        TypeLiteral = 139,
-        ArrayType = 140,
-        TupleType = 141,
-        UnionType = 142,
-        ParenthesizedType = 143,
-        ObjectBindingPattern = 144,
-        ArrayBindingPattern = 145,
-        BindingElement = 146,
-        ArrayLiteralExpression = 147,
-        ObjectLiteralExpression = 148,
-        PropertyAccessExpression = 149,
-        ElementAccessExpression = 150,
-        CallExpression = 151,
-        NewExpression = 152,
-        TaggedTemplateExpression = 153,
-        TypeAssertionExpression = 154,
-        ParenthesizedExpression = 155,
-        FunctionExpression = 156,
-        ArrowFunction = 157,
-        DeleteExpression = 158,
-        TypeOfExpression = 159,
-        VoidExpression = 160,
-        PrefixUnaryExpression = 161,
-        PostfixUnaryExpression = 162,
-        BinaryExpression = 163,
-        ConditionalExpression = 164,
-        TemplateExpression = 165,
-        YieldExpression = 166,
-        SpreadElementExpression = 167,
-        OmittedExpression = 168,
-        TemplateSpan = 169,
-        Block = 170,
-        VariableStatement = 171,
-        EmptyStatement = 172,
-        ExpressionStatement = 173,
-        IfStatement = 174,
-        DoStatement = 175,
-        WhileStatement = 176,
-        ForStatement = 177,
-        ForInStatement = 178,
-        ContinueStatement = 179,
-        BreakStatement = 180,
-        ReturnStatement = 181,
-        WithStatement = 182,
-        SwitchStatement = 183,
-        LabeledStatement = 184,
-        ThrowStatement = 185,
-        TryStatement = 186,
-        DebuggerStatement = 187,
-        VariableDeclaration = 188,
-        VariableDeclarationList = 189,
-        FunctionDeclaration = 190,
-        ClassDeclaration = 191,
-        InterfaceDeclaration = 192,
-        TypeAliasDeclaration = 193,
-        EnumDeclaration = 194,
-        ModuleDeclaration = 195,
-        ModuleBlock = 196,
-        ImportDeclaration = 197,
-        ExportAssignment = 198,
-        ExternalModuleReference = 199,
-        CaseClause = 200,
-        DefaultClause = 201,
-        HeritageClause = 202,
-        CatchClause = 203,
-        PropertyAssignment = 204,
-        ShorthandPropertyAssignment = 205,
-        EnumMember = 206,
-        SourceFile = 207,
-        SyntaxList = 208,
-        Count = 209,
+        SymbolKeyword = 120,
+        TypeKeyword = 121,
+        QualifiedName = 122,
+        ComputedPropertyName = 123,
+        TypeParameter = 124,
+        Parameter = 125,
+        PropertySignature = 126,
+        PropertyDeclaration = 127,
+        MethodSignature = 128,
+        MethodDeclaration = 129,
+        Constructor = 130,
+        GetAccessor = 131,
+        SetAccessor = 132,
+        CallSignature = 133,
+        ConstructSignature = 134,
+        IndexSignature = 135,
+        TypeReference = 136,
+        FunctionType = 137,
+        ConstructorType = 138,
+        TypeQuery = 139,
+        TypeLiteral = 140,
+        ArrayType = 141,
+        TupleType = 142,
+        UnionType = 143,
+        ParenthesizedType = 144,
+        ObjectBindingPattern = 145,
+        ArrayBindingPattern = 146,
+        BindingElement = 147,
+        ArrayLiteralExpression = 148,
+        ObjectLiteralExpression = 149,
+        PropertyAccessExpression = 150,
+        ElementAccessExpression = 151,
+        CallExpression = 152,
+        NewExpression = 153,
+        TaggedTemplateExpression = 154,
+        TypeAssertionExpression = 155,
+        ParenthesizedExpression = 156,
+        FunctionExpression = 157,
+        ArrowFunction = 158,
+        DeleteExpression = 159,
+        TypeOfExpression = 160,
+        VoidExpression = 161,
+        PrefixUnaryExpression = 162,
+        PostfixUnaryExpression = 163,
+        BinaryExpression = 164,
+        ConditionalExpression = 165,
+        TemplateExpression = 166,
+        YieldExpression = 167,
+        SpreadElementExpression = 168,
+        OmittedExpression = 169,
+        TemplateSpan = 170,
+        Block = 171,
+        VariableStatement = 172,
+        EmptyStatement = 173,
+        ExpressionStatement = 174,
+        IfStatement = 175,
+        DoStatement = 176,
+        WhileStatement = 177,
+        ForStatement = 178,
+        ForInStatement = 179,
+        ContinueStatement = 180,
+        BreakStatement = 181,
+        ReturnStatement = 182,
+        WithStatement = 183,
+        SwitchStatement = 184,
+        LabeledStatement = 185,
+        ThrowStatement = 186,
+        TryStatement = 187,
+        DebuggerStatement = 188,
+        VariableDeclaration = 189,
+        VariableDeclarationList = 190,
+        FunctionDeclaration = 191,
+        ClassDeclaration = 192,
+        InterfaceDeclaration = 193,
+        TypeAliasDeclaration = 194,
+        EnumDeclaration = 195,
+        ModuleDeclaration = 196,
+        ModuleBlock = 197,
+        ImportDeclaration = 198,
+        ExportAssignment = 199,
+        ExternalModuleReference = 200,
+        CaseClause = 201,
+        DefaultClause = 202,
+        HeritageClause = 203,
+        CatchClause = 204,
+        PropertyAssignment = 205,
+        ShorthandPropertyAssignment = 206,
+        EnumMember = 207,
+        SourceFile = 208,
+        SyntaxList = 209,
+        Count = 210,
         FirstAssignment = 52,
         LastAssignment = 63,
         FirstReservedWord = 65,
         LastReservedWord = 100,
         FirstKeyword = 65,
-        LastKeyword = 120,
+        LastKeyword = 121,
         FirstFutureReservedWord = 101,
         LastFutureReservedWord = 109,
-        FirstTypeNode = 135,
-        LastTypeNode = 143,
+        FirstTypeNode = 136,
+        LastTypeNode = 144,
         FirstPunctuation = 14,
         LastPunctuation = 63,
         FirstToken = 0,
-        LastToken = 120,
+        LastToken = 121,
         FirstTriviaToken = 2,
         LastTriviaToken = 6,
         FirstLiteralToken = 7,
@@ -323,7 +324,7 @@ declare module "typescript" {
         LastTemplateToken = 13,
         FirstBinaryOperator = 24,
         LastBinaryOperator = 63,
-        FirstNode = 121,
+        FirstNode = 122,
     }
     const enum NodeFlags {
         Export = 1,
@@ -1063,8 +1064,9 @@ declare module "typescript" {
         ObjectLiteral = 131072,
         ContainsUndefinedOrNull = 262144,
         ContainsObjectLiteral = 524288,
-        Intrinsic = 127,
-        Primitive = 510,
+        ESSymbol = 1048576,
+        Intrinsic = 1048703,
+        Primitive = 1049086,
         StringLike = 258,
         NumberLike = 132,
         ObjectType = 48128,
diff --git a/tests/baselines/reference/APISample_transform.types b/tests/baselines/reference/APISample_transform.types
index 0c201b0a5fd44..d2cfc6f633b1a 100644
--- a/tests/baselines/reference/APISample_transform.types
+++ b/tests/baselines/reference/APISample_transform.types
@@ -649,274 +649,277 @@ declare module "typescript" {
         StringKeyword = 119,

 >StringKeyword : SyntaxKind
 
-        TypeKeyword = 120,

+        SymbolKeyword = 120,

+>SymbolKeyword : SyntaxKind
+
+        TypeKeyword = 121,

 >TypeKeyword : SyntaxKind
 
-        QualifiedName = 121,

+        QualifiedName = 122,

 >QualifiedName : SyntaxKind
 
-        ComputedPropertyName = 122,

+        ComputedPropertyName = 123,

 >ComputedPropertyName : SyntaxKind
 
-        TypeParameter = 123,

+        TypeParameter = 124,

 >TypeParameter : SyntaxKind
 
-        Parameter = 124,

+        Parameter = 125,

 >Parameter : SyntaxKind
 
-        PropertySignature = 125,

+        PropertySignature = 126,

 >PropertySignature : SyntaxKind
 
-        PropertyDeclaration = 126,

+        PropertyDeclaration = 127,

 >PropertyDeclaration : SyntaxKind
 
-        MethodSignature = 127,

+        MethodSignature = 128,

 >MethodSignature : SyntaxKind
 
-        MethodDeclaration = 128,

+        MethodDeclaration = 129,

 >MethodDeclaration : SyntaxKind
 
-        Constructor = 129,

+        Constructor = 130,

 >Constructor : SyntaxKind
 
-        GetAccessor = 130,

+        GetAccessor = 131,

 >GetAccessor : SyntaxKind
 
-        SetAccessor = 131,

+        SetAccessor = 132,

 >SetAccessor : SyntaxKind
 
-        CallSignature = 132,

+        CallSignature = 133,

 >CallSignature : SyntaxKind
 
-        ConstructSignature = 133,

+        ConstructSignature = 134,

 >ConstructSignature : SyntaxKind
 
-        IndexSignature = 134,

+        IndexSignature = 135,

 >IndexSignature : SyntaxKind
 
-        TypeReference = 135,

+        TypeReference = 136,

 >TypeReference : SyntaxKind
 
-        FunctionType = 136,

+        FunctionType = 137,

 >FunctionType : SyntaxKind
 
-        ConstructorType = 137,

+        ConstructorType = 138,

 >ConstructorType : SyntaxKind
 
-        TypeQuery = 138,

+        TypeQuery = 139,

 >TypeQuery : SyntaxKind
 
-        TypeLiteral = 139,

+        TypeLiteral = 140,

 >TypeLiteral : SyntaxKind
 
-        ArrayType = 140,

+        ArrayType = 141,

 >ArrayType : SyntaxKind
 
-        TupleType = 141,

+        TupleType = 142,

 >TupleType : SyntaxKind
 
-        UnionType = 142,

+        UnionType = 143,

 >UnionType : SyntaxKind
 
-        ParenthesizedType = 143,

+        ParenthesizedType = 144,

 >ParenthesizedType : SyntaxKind
 
-        ObjectBindingPattern = 144,

+        ObjectBindingPattern = 145,

 >ObjectBindingPattern : SyntaxKind
 
-        ArrayBindingPattern = 145,

+        ArrayBindingPattern = 146,

 >ArrayBindingPattern : SyntaxKind
 
-        BindingElement = 146,

+        BindingElement = 147,

 >BindingElement : SyntaxKind
 
-        ArrayLiteralExpression = 147,

+        ArrayLiteralExpression = 148,

 >ArrayLiteralExpression : SyntaxKind
 
-        ObjectLiteralExpression = 148,

+        ObjectLiteralExpression = 149,

 >ObjectLiteralExpression : SyntaxKind
 
-        PropertyAccessExpression = 149,

+        PropertyAccessExpression = 150,

 >PropertyAccessExpression : SyntaxKind
 
-        ElementAccessExpression = 150,

+        ElementAccessExpression = 151,

 >ElementAccessExpression : SyntaxKind
 
-        CallExpression = 151,

+        CallExpression = 152,

 >CallExpression : SyntaxKind
 
-        NewExpression = 152,

+        NewExpression = 153,

 >NewExpression : SyntaxKind
 
-        TaggedTemplateExpression = 153,

+        TaggedTemplateExpression = 154,

 >TaggedTemplateExpression : SyntaxKind
 
-        TypeAssertionExpression = 154,

+        TypeAssertionExpression = 155,

 >TypeAssertionExpression : SyntaxKind
 
-        ParenthesizedExpression = 155,

+        ParenthesizedExpression = 156,

 >ParenthesizedExpression : SyntaxKind
 
-        FunctionExpression = 156,

+        FunctionExpression = 157,

 >FunctionExpression : SyntaxKind
 
-        ArrowFunction = 157,

+        ArrowFunction = 158,

 >ArrowFunction : SyntaxKind
 
-        DeleteExpression = 158,

+        DeleteExpression = 159,

 >DeleteExpression : SyntaxKind
 
-        TypeOfExpression = 159,

+        TypeOfExpression = 160,

 >TypeOfExpression : SyntaxKind
 
-        VoidExpression = 160,

+        VoidExpression = 161,

 >VoidExpression : SyntaxKind
 
-        PrefixUnaryExpression = 161,

+        PrefixUnaryExpression = 162,

 >PrefixUnaryExpression : SyntaxKind
 
-        PostfixUnaryExpression = 162,

+        PostfixUnaryExpression = 163,

 >PostfixUnaryExpression : SyntaxKind
 
-        BinaryExpression = 163,

+        BinaryExpression = 164,

 >BinaryExpression : SyntaxKind
 
-        ConditionalExpression = 164,

+        ConditionalExpression = 165,

 >ConditionalExpression : SyntaxKind
 
-        TemplateExpression = 165,

+        TemplateExpression = 166,

 >TemplateExpression : SyntaxKind
 
-        YieldExpression = 166,

+        YieldExpression = 167,

 >YieldExpression : SyntaxKind
 
-        SpreadElementExpression = 167,

+        SpreadElementExpression = 168,

 >SpreadElementExpression : SyntaxKind
 
-        OmittedExpression = 168,

+        OmittedExpression = 169,

 >OmittedExpression : SyntaxKind
 
-        TemplateSpan = 169,

+        TemplateSpan = 170,

 >TemplateSpan : SyntaxKind
 
-        Block = 170,

+        Block = 171,

 >Block : SyntaxKind
 
-        VariableStatement = 171,

+        VariableStatement = 172,

 >VariableStatement : SyntaxKind
 
-        EmptyStatement = 172,

+        EmptyStatement = 173,

 >EmptyStatement : SyntaxKind
 
-        ExpressionStatement = 173,

+        ExpressionStatement = 174,

 >ExpressionStatement : SyntaxKind
 
-        IfStatement = 174,

+        IfStatement = 175,

 >IfStatement : SyntaxKind
 
-        DoStatement = 175,

+        DoStatement = 176,

 >DoStatement : SyntaxKind
 
-        WhileStatement = 176,

+        WhileStatement = 177,

 >WhileStatement : SyntaxKind
 
-        ForStatement = 177,

+        ForStatement = 178,

 >ForStatement : SyntaxKind
 
-        ForInStatement = 178,

+        ForInStatement = 179,

 >ForInStatement : SyntaxKind
 
-        ContinueStatement = 179,

+        ContinueStatement = 180,

 >ContinueStatement : SyntaxKind
 
-        BreakStatement = 180,

+        BreakStatement = 181,

 >BreakStatement : SyntaxKind
 
-        ReturnStatement = 181,

+        ReturnStatement = 182,

 >ReturnStatement : SyntaxKind
 
-        WithStatement = 182,

+        WithStatement = 183,

 >WithStatement : SyntaxKind
 
-        SwitchStatement = 183,

+        SwitchStatement = 184,

 >SwitchStatement : SyntaxKind
 
-        LabeledStatement = 184,

+        LabeledStatement = 185,

 >LabeledStatement : SyntaxKind
 
-        ThrowStatement = 185,

+        ThrowStatement = 186,

 >ThrowStatement : SyntaxKind
 
-        TryStatement = 186,

+        TryStatement = 187,

 >TryStatement : SyntaxKind
 
-        DebuggerStatement = 187,

+        DebuggerStatement = 188,

 >DebuggerStatement : SyntaxKind
 
-        VariableDeclaration = 188,

+        VariableDeclaration = 189,

 >VariableDeclaration : SyntaxKind
 
-        VariableDeclarationList = 189,

+        VariableDeclarationList = 190,

 >VariableDeclarationList : SyntaxKind
 
-        FunctionDeclaration = 190,

+        FunctionDeclaration = 191,

 >FunctionDeclaration : SyntaxKind
 
-        ClassDeclaration = 191,

+        ClassDeclaration = 192,

 >ClassDeclaration : SyntaxKind
 
-        InterfaceDeclaration = 192,

+        InterfaceDeclaration = 193,

 >InterfaceDeclaration : SyntaxKind
 
-        TypeAliasDeclaration = 193,

+        TypeAliasDeclaration = 194,

 >TypeAliasDeclaration : SyntaxKind
 
-        EnumDeclaration = 194,

+        EnumDeclaration = 195,

 >EnumDeclaration : SyntaxKind
 
-        ModuleDeclaration = 195,

+        ModuleDeclaration = 196,

 >ModuleDeclaration : SyntaxKind
 
-        ModuleBlock = 196,

+        ModuleBlock = 197,

 >ModuleBlock : SyntaxKind
 
-        ImportDeclaration = 197,

+        ImportDeclaration = 198,

 >ImportDeclaration : SyntaxKind
 
-        ExportAssignment = 198,

+        ExportAssignment = 199,

 >ExportAssignment : SyntaxKind
 
-        ExternalModuleReference = 199,

+        ExternalModuleReference = 200,

 >ExternalModuleReference : SyntaxKind
 
-        CaseClause = 200,

+        CaseClause = 201,

 >CaseClause : SyntaxKind
 
-        DefaultClause = 201,

+        DefaultClause = 202,

 >DefaultClause : SyntaxKind
 
-        HeritageClause = 202,

+        HeritageClause = 203,

 >HeritageClause : SyntaxKind
 
-        CatchClause = 203,

+        CatchClause = 204,

 >CatchClause : SyntaxKind
 
-        PropertyAssignment = 204,

+        PropertyAssignment = 205,

 >PropertyAssignment : SyntaxKind
 
-        ShorthandPropertyAssignment = 205,

+        ShorthandPropertyAssignment = 206,

 >ShorthandPropertyAssignment : SyntaxKind
 
-        EnumMember = 206,

+        EnumMember = 207,

 >EnumMember : SyntaxKind
 
-        SourceFile = 207,

+        SourceFile = 208,

 >SourceFile : SyntaxKind
 
-        SyntaxList = 208,

+        SyntaxList = 209,

 >SyntaxList : SyntaxKind
 
-        Count = 209,

+        Count = 210,

 >Count : SyntaxKind
 
         FirstAssignment = 52,

@@ -934,7 +937,7 @@ declare module "typescript" {
         FirstKeyword = 65,

 >FirstKeyword : SyntaxKind
 
-        LastKeyword = 120,

+        LastKeyword = 121,

 >LastKeyword : SyntaxKind
 
         FirstFutureReservedWord = 101,

@@ -943,10 +946,10 @@ declare module "typescript" {
         LastFutureReservedWord = 109,

 >LastFutureReservedWord : SyntaxKind
 
-        FirstTypeNode = 135,

+        FirstTypeNode = 136,

 >FirstTypeNode : SyntaxKind
 
-        LastTypeNode = 143,

+        LastTypeNode = 144,

 >LastTypeNode : SyntaxKind
 
         FirstPunctuation = 14,

@@ -958,7 +961,7 @@ declare module "typescript" {
         FirstToken = 0,

 >FirstToken : SyntaxKind
 
-        LastToken = 120,

+        LastToken = 121,

 >LastToken : SyntaxKind
 
         FirstTriviaToken = 2,

@@ -985,7 +988,7 @@ declare module "typescript" {
         LastBinaryOperator = 63,

 >LastBinaryOperator : SyntaxKind
 
-        FirstNode = 121,

+        FirstNode = 122,

 >FirstNode : SyntaxKind
     }

     const enum NodeFlags {

@@ -3414,10 +3417,13 @@ declare module "typescript" {
         ContainsObjectLiteral = 524288,

 >ContainsObjectLiteral : TypeFlags
 
-        Intrinsic = 127,

+        ESSymbol = 1048576,

+>ESSymbol : TypeFlags
+
+        Intrinsic = 1048703,

 >Intrinsic : TypeFlags
 
-        Primitive = 510,

+        Primitive = 1049086,

 >Primitive : TypeFlags
 
         StringLike = 258,

diff --git a/tests/baselines/reference/APISample_watcher.js b/tests/baselines/reference/APISample_watcher.js
index 27a2ce5e41556..158562aeaf843 100644
--- a/tests/baselines/reference/APISample_watcher.js
+++ b/tests/baselines/reference/APISample_watcher.js
@@ -248,110 +248,111 @@ declare module "typescript" {
         NumberKeyword = 117,
         SetKeyword = 118,
         StringKeyword = 119,
-        TypeKeyword = 120,
-        QualifiedName = 121,
-        ComputedPropertyName = 122,
-        TypeParameter = 123,
-        Parameter = 124,
-        PropertySignature = 125,
-        PropertyDeclaration = 126,
-        MethodSignature = 127,
-        MethodDeclaration = 128,
-        Constructor = 129,
-        GetAccessor = 130,
-        SetAccessor = 131,
-        CallSignature = 132,
-        ConstructSignature = 133,
-        IndexSignature = 134,
-        TypeReference = 135,
-        FunctionType = 136,
-        ConstructorType = 137,
-        TypeQuery = 138,
-        TypeLiteral = 139,
-        ArrayType = 140,
-        TupleType = 141,
-        UnionType = 142,
-        ParenthesizedType = 143,
-        ObjectBindingPattern = 144,
-        ArrayBindingPattern = 145,
-        BindingElement = 146,
-        ArrayLiteralExpression = 147,
-        ObjectLiteralExpression = 148,
-        PropertyAccessExpression = 149,
-        ElementAccessExpression = 150,
-        CallExpression = 151,
-        NewExpression = 152,
-        TaggedTemplateExpression = 153,
-        TypeAssertionExpression = 154,
-        ParenthesizedExpression = 155,
-        FunctionExpression = 156,
-        ArrowFunction = 157,
-        DeleteExpression = 158,
-        TypeOfExpression = 159,
-        VoidExpression = 160,
-        PrefixUnaryExpression = 161,
-        PostfixUnaryExpression = 162,
-        BinaryExpression = 163,
-        ConditionalExpression = 164,
-        TemplateExpression = 165,
-        YieldExpression = 166,
-        SpreadElementExpression = 167,
-        OmittedExpression = 168,
-        TemplateSpan = 169,
-        Block = 170,
-        VariableStatement = 171,
-        EmptyStatement = 172,
-        ExpressionStatement = 173,
-        IfStatement = 174,
-        DoStatement = 175,
-        WhileStatement = 176,
-        ForStatement = 177,
-        ForInStatement = 178,
-        ContinueStatement = 179,
-        BreakStatement = 180,
-        ReturnStatement = 181,
-        WithStatement = 182,
-        SwitchStatement = 183,
-        LabeledStatement = 184,
-        ThrowStatement = 185,
-        TryStatement = 186,
-        DebuggerStatement = 187,
-        VariableDeclaration = 188,
-        VariableDeclarationList = 189,
-        FunctionDeclaration = 190,
-        ClassDeclaration = 191,
-        InterfaceDeclaration = 192,
-        TypeAliasDeclaration = 193,
-        EnumDeclaration = 194,
-        ModuleDeclaration = 195,
-        ModuleBlock = 196,
-        ImportDeclaration = 197,
-        ExportAssignment = 198,
-        ExternalModuleReference = 199,
-        CaseClause = 200,
-        DefaultClause = 201,
-        HeritageClause = 202,
-        CatchClause = 203,
-        PropertyAssignment = 204,
-        ShorthandPropertyAssignment = 205,
-        EnumMember = 206,
-        SourceFile = 207,
-        SyntaxList = 208,
-        Count = 209,
+        SymbolKeyword = 120,
+        TypeKeyword = 121,
+        QualifiedName = 122,
+        ComputedPropertyName = 123,
+        TypeParameter = 124,
+        Parameter = 125,
+        PropertySignature = 126,
+        PropertyDeclaration = 127,
+        MethodSignature = 128,
+        MethodDeclaration = 129,
+        Constructor = 130,
+        GetAccessor = 131,
+        SetAccessor = 132,
+        CallSignature = 133,
+        ConstructSignature = 134,
+        IndexSignature = 135,
+        TypeReference = 136,
+        FunctionType = 137,
+        ConstructorType = 138,
+        TypeQuery = 139,
+        TypeLiteral = 140,
+        ArrayType = 141,
+        TupleType = 142,
+        UnionType = 143,
+        ParenthesizedType = 144,
+        ObjectBindingPattern = 145,
+        ArrayBindingPattern = 146,
+        BindingElement = 147,
+        ArrayLiteralExpression = 148,
+        ObjectLiteralExpression = 149,
+        PropertyAccessExpression = 150,
+        ElementAccessExpression = 151,
+        CallExpression = 152,
+        NewExpression = 153,
+        TaggedTemplateExpression = 154,
+        TypeAssertionExpression = 155,
+        ParenthesizedExpression = 156,
+        FunctionExpression = 157,
+        ArrowFunction = 158,
+        DeleteExpression = 159,
+        TypeOfExpression = 160,
+        VoidExpression = 161,
+        PrefixUnaryExpression = 162,
+        PostfixUnaryExpression = 163,
+        BinaryExpression = 164,
+        ConditionalExpression = 165,
+        TemplateExpression = 166,
+        YieldExpression = 167,
+        SpreadElementExpression = 168,
+        OmittedExpression = 169,
+        TemplateSpan = 170,
+        Block = 171,
+        VariableStatement = 172,
+        EmptyStatement = 173,
+        ExpressionStatement = 174,
+        IfStatement = 175,
+        DoStatement = 176,
+        WhileStatement = 177,
+        ForStatement = 178,
+        ForInStatement = 179,
+        ContinueStatement = 180,
+        BreakStatement = 181,
+        ReturnStatement = 182,
+        WithStatement = 183,
+        SwitchStatement = 184,
+        LabeledStatement = 185,
+        ThrowStatement = 186,
+        TryStatement = 187,
+        DebuggerStatement = 188,
+        VariableDeclaration = 189,
+        VariableDeclarationList = 190,
+        FunctionDeclaration = 191,
+        ClassDeclaration = 192,
+        InterfaceDeclaration = 193,
+        TypeAliasDeclaration = 194,
+        EnumDeclaration = 195,
+        ModuleDeclaration = 196,
+        ModuleBlock = 197,
+        ImportDeclaration = 198,
+        ExportAssignment = 199,
+        ExternalModuleReference = 200,
+        CaseClause = 201,
+        DefaultClause = 202,
+        HeritageClause = 203,
+        CatchClause = 204,
+        PropertyAssignment = 205,
+        ShorthandPropertyAssignment = 206,
+        EnumMember = 207,
+        SourceFile = 208,
+        SyntaxList = 209,
+        Count = 210,
         FirstAssignment = 52,
         LastAssignment = 63,
         FirstReservedWord = 65,
         LastReservedWord = 100,
         FirstKeyword = 65,
-        LastKeyword = 120,
+        LastKeyword = 121,
         FirstFutureReservedWord = 101,
         LastFutureReservedWord = 109,
-        FirstTypeNode = 135,
-        LastTypeNode = 143,
+        FirstTypeNode = 136,
+        LastTypeNode = 144,
         FirstPunctuation = 14,
         LastPunctuation = 63,
         FirstToken = 0,
-        LastToken = 120,
+        LastToken = 121,
         FirstTriviaToken = 2,
         LastTriviaToken = 6,
         FirstLiteralToken = 7,
@@ -360,7 +361,7 @@ declare module "typescript" {
         LastTemplateToken = 13,
         FirstBinaryOperator = 24,
         LastBinaryOperator = 63,
-        FirstNode = 121,
+        FirstNode = 122,
     }
     const enum NodeFlags {
         Export = 1,
@@ -1100,8 +1101,9 @@ declare module "typescript" {
         ObjectLiteral = 131072,
         ContainsUndefinedOrNull = 262144,
         ContainsObjectLiteral = 524288,
-        Intrinsic = 127,
-        Primitive = 510,
+        ESSymbol = 1048576,
+        Intrinsic = 1048703,
+        Primitive = 1049086,
         StringLike = 258,
         NumberLike = 132,
         ObjectType = 48128,
diff --git a/tests/baselines/reference/APISample_watcher.types b/tests/baselines/reference/APISample_watcher.types
index 4e137cae59d1a..36bce4fa9f564 100644
--- a/tests/baselines/reference/APISample_watcher.types
+++ b/tests/baselines/reference/APISample_watcher.types
@@ -822,274 +822,277 @@ declare module "typescript" {
         StringKeyword = 119,

 >StringKeyword : SyntaxKind
 
-        TypeKeyword = 120,

+        SymbolKeyword = 120,

+>SymbolKeyword : SyntaxKind
+
+        TypeKeyword = 121,

 >TypeKeyword : SyntaxKind
 
-        QualifiedName = 121,

+        QualifiedName = 122,

 >QualifiedName : SyntaxKind
 
-        ComputedPropertyName = 122,

+        ComputedPropertyName = 123,

 >ComputedPropertyName : SyntaxKind
 
-        TypeParameter = 123,

+        TypeParameter = 124,

 >TypeParameter : SyntaxKind
 
-        Parameter = 124,

+        Parameter = 125,

 >Parameter : SyntaxKind
 
-        PropertySignature = 125,

+        PropertySignature = 126,

 >PropertySignature : SyntaxKind
 
-        PropertyDeclaration = 126,

+        PropertyDeclaration = 127,

 >PropertyDeclaration : SyntaxKind
 
-        MethodSignature = 127,

+        MethodSignature = 128,

 >MethodSignature : SyntaxKind
 
-        MethodDeclaration = 128,

+        MethodDeclaration = 129,

 >MethodDeclaration : SyntaxKind
 
-        Constructor = 129,

+        Constructor = 130,

 >Constructor : SyntaxKind
 
-        GetAccessor = 130,

+        GetAccessor = 131,

 >GetAccessor : SyntaxKind
 
-        SetAccessor = 131,

+        SetAccessor = 132,

 >SetAccessor : SyntaxKind
 
-        CallSignature = 132,

+        CallSignature = 133,

 >CallSignature : SyntaxKind
 
-        ConstructSignature = 133,

+        ConstructSignature = 134,

 >ConstructSignature : SyntaxKind
 
-        IndexSignature = 134,

+        IndexSignature = 135,

 >IndexSignature : SyntaxKind
 
-        TypeReference = 135,

+        TypeReference = 136,

 >TypeReference : SyntaxKind
 
-        FunctionType = 136,

+        FunctionType = 137,

 >FunctionType : SyntaxKind
 
-        ConstructorType = 137,

+        ConstructorType = 138,

 >ConstructorType : SyntaxKind
 
-        TypeQuery = 138,

+        TypeQuery = 139,

 >TypeQuery : SyntaxKind
 
-        TypeLiteral = 139,

+        TypeLiteral = 140,

 >TypeLiteral : SyntaxKind
 
-        ArrayType = 140,

+        ArrayType = 141,

 >ArrayType : SyntaxKind
 
-        TupleType = 141,

+        TupleType = 142,

 >TupleType : SyntaxKind
 
-        UnionType = 142,

+        UnionType = 143,

 >UnionType : SyntaxKind
 
-        ParenthesizedType = 143,

+        ParenthesizedType = 144,

 >ParenthesizedType : SyntaxKind
 
-        ObjectBindingPattern = 144,

+        ObjectBindingPattern = 145,

 >ObjectBindingPattern : SyntaxKind
 
-        ArrayBindingPattern = 145,

+        ArrayBindingPattern = 146,

 >ArrayBindingPattern : SyntaxKind
 
-        BindingElement = 146,

+        BindingElement = 147,

 >BindingElement : SyntaxKind
 
-        ArrayLiteralExpression = 147,

+        ArrayLiteralExpression = 148,

 >ArrayLiteralExpression : SyntaxKind
 
-        ObjectLiteralExpression = 148,

+        ObjectLiteralExpression = 149,

 >ObjectLiteralExpression : SyntaxKind
 
-        PropertyAccessExpression = 149,

+        PropertyAccessExpression = 150,

 >PropertyAccessExpression : SyntaxKind
 
-        ElementAccessExpression = 150,

+        ElementAccessExpression = 151,

 >ElementAccessExpression : SyntaxKind
 
-        CallExpression = 151,

+        CallExpression = 152,

 >CallExpression : SyntaxKind
 
-        NewExpression = 152,

+        NewExpression = 153,

 >NewExpression : SyntaxKind
 
-        TaggedTemplateExpression = 153,

+        TaggedTemplateExpression = 154,

 >TaggedTemplateExpression : SyntaxKind
 
-        TypeAssertionExpression = 154,

+        TypeAssertionExpression = 155,

 >TypeAssertionExpression : SyntaxKind
 
-        ParenthesizedExpression = 155,

+        ParenthesizedExpression = 156,

 >ParenthesizedExpression : SyntaxKind
 
-        FunctionExpression = 156,

+        FunctionExpression = 157,

 >FunctionExpression : SyntaxKind
 
-        ArrowFunction = 157,

+        ArrowFunction = 158,

 >ArrowFunction : SyntaxKind
 
-        DeleteExpression = 158,

+        DeleteExpression = 159,

 >DeleteExpression : SyntaxKind
 
-        TypeOfExpression = 159,

+        TypeOfExpression = 160,

 >TypeOfExpression : SyntaxKind
 
-        VoidExpression = 160,

+        VoidExpression = 161,

 >VoidExpression : SyntaxKind
 
-        PrefixUnaryExpression = 161,

+        PrefixUnaryExpression = 162,

 >PrefixUnaryExpression : SyntaxKind
 
-        PostfixUnaryExpression = 162,

+        PostfixUnaryExpression = 163,

 >PostfixUnaryExpression : SyntaxKind
 
-        BinaryExpression = 163,

+        BinaryExpression = 164,

 >BinaryExpression : SyntaxKind
 
-        ConditionalExpression = 164,

+        ConditionalExpression = 165,

 >ConditionalExpression : SyntaxKind
 
-        TemplateExpression = 165,

+        TemplateExpression = 166,

 >TemplateExpression : SyntaxKind
 
-        YieldExpression = 166,

+        YieldExpression = 167,

 >YieldExpression : SyntaxKind
 
-        SpreadElementExpression = 167,

+        SpreadElementExpression = 168,

 >SpreadElementExpression : SyntaxKind
 
-        OmittedExpression = 168,

+        OmittedExpression = 169,

 >OmittedExpression : SyntaxKind
 
-        TemplateSpan = 169,

+        TemplateSpan = 170,

 >TemplateSpan : SyntaxKind
 
-        Block = 170,

+        Block = 171,

 >Block : SyntaxKind
 
-        VariableStatement = 171,

+        VariableStatement = 172,

 >VariableStatement : SyntaxKind
 
-        EmptyStatement = 172,

+        EmptyStatement = 173,

 >EmptyStatement : SyntaxKind
 
-        ExpressionStatement = 173,

+        ExpressionStatement = 174,

 >ExpressionStatement : SyntaxKind
 
-        IfStatement = 174,

+        IfStatement = 175,

 >IfStatement : SyntaxKind
 
-        DoStatement = 175,

+        DoStatement = 176,

 >DoStatement : SyntaxKind
 
-        WhileStatement = 176,

+        WhileStatement = 177,

 >WhileStatement : SyntaxKind
 
-        ForStatement = 177,

+        ForStatement = 178,

 >ForStatement : SyntaxKind
 
-        ForInStatement = 178,

+        ForInStatement = 179,

 >ForInStatement : SyntaxKind
 
-        ContinueStatement = 179,

+        ContinueStatement = 180,

 >ContinueStatement : SyntaxKind
 
-        BreakStatement = 180,

+        BreakStatement = 181,

 >BreakStatement : SyntaxKind
 
-        ReturnStatement = 181,

+        ReturnStatement = 182,

 >ReturnStatement : SyntaxKind
 
-        WithStatement = 182,

+        WithStatement = 183,

 >WithStatement : SyntaxKind
 
-        SwitchStatement = 183,

+        SwitchStatement = 184,

 >SwitchStatement : SyntaxKind
 
-        LabeledStatement = 184,

+        LabeledStatement = 185,

 >LabeledStatement : SyntaxKind
 
-        ThrowStatement = 185,

+        ThrowStatement = 186,

 >ThrowStatement : SyntaxKind
 
-        TryStatement = 186,

+        TryStatement = 187,

 >TryStatement : SyntaxKind
 
-        DebuggerStatement = 187,

+        DebuggerStatement = 188,

 >DebuggerStatement : SyntaxKind
 
-        VariableDeclaration = 188,

+        VariableDeclaration = 189,

 >VariableDeclaration : SyntaxKind
 
-        VariableDeclarationList = 189,

+        VariableDeclarationList = 190,

 >VariableDeclarationList : SyntaxKind
 
-        FunctionDeclaration = 190,

+        FunctionDeclaration = 191,

 >FunctionDeclaration : SyntaxKind
 
-        ClassDeclaration = 191,

+        ClassDeclaration = 192,

 >ClassDeclaration : SyntaxKind
 
-        InterfaceDeclaration = 192,

+        InterfaceDeclaration = 193,

 >InterfaceDeclaration : SyntaxKind
 
-        TypeAliasDeclaration = 193,

+        TypeAliasDeclaration = 194,

 >TypeAliasDeclaration : SyntaxKind
 
-        EnumDeclaration = 194,

+        EnumDeclaration = 195,

 >EnumDeclaration : SyntaxKind
 
-        ModuleDeclaration = 195,

+        ModuleDeclaration = 196,

 >ModuleDeclaration : SyntaxKind
 
-        ModuleBlock = 196,

+        ModuleBlock = 197,

 >ModuleBlock : SyntaxKind
 
-        ImportDeclaration = 197,

+        ImportDeclaration = 198,

 >ImportDeclaration : SyntaxKind
 
-        ExportAssignment = 198,

+        ExportAssignment = 199,

 >ExportAssignment : SyntaxKind
 
-        ExternalModuleReference = 199,

+        ExternalModuleReference = 200,

 >ExternalModuleReference : SyntaxKind
 
-        CaseClause = 200,

+        CaseClause = 201,

 >CaseClause : SyntaxKind
 
-        DefaultClause = 201,

+        DefaultClause = 202,

 >DefaultClause : SyntaxKind
 
-        HeritageClause = 202,

+        HeritageClause = 203,

 >HeritageClause : SyntaxKind
 
-        CatchClause = 203,

+        CatchClause = 204,

 >CatchClause : SyntaxKind
 
-        PropertyAssignment = 204,

+        PropertyAssignment = 205,

 >PropertyAssignment : SyntaxKind
 
-        ShorthandPropertyAssignment = 205,

+        ShorthandPropertyAssignment = 206,

 >ShorthandPropertyAssignment : SyntaxKind
 
-        EnumMember = 206,

+        EnumMember = 207,

 >EnumMember : SyntaxKind
 
-        SourceFile = 207,

+        SourceFile = 208,

 >SourceFile : SyntaxKind
 
-        SyntaxList = 208,

+        SyntaxList = 209,

 >SyntaxList : SyntaxKind
 
-        Count = 209,

+        Count = 210,

 >Count : SyntaxKind
 
         FirstAssignment = 52,

@@ -1107,7 +1110,7 @@ declare module "typescript" {
         FirstKeyword = 65,

 >FirstKeyword : SyntaxKind
 
-        LastKeyword = 120,

+        LastKeyword = 121,

 >LastKeyword : SyntaxKind
 
         FirstFutureReservedWord = 101,

@@ -1116,10 +1119,10 @@ declare module "typescript" {
         LastFutureReservedWord = 109,

 >LastFutureReservedWord : SyntaxKind
 
-        FirstTypeNode = 135,

+        FirstTypeNode = 136,

 >FirstTypeNode : SyntaxKind
 
-        LastTypeNode = 143,

+        LastTypeNode = 144,

 >LastTypeNode : SyntaxKind
 
         FirstPunctuation = 14,

@@ -1131,7 +1134,7 @@ declare module "typescript" {
         FirstToken = 0,

 >FirstToken : SyntaxKind
 
-        LastToken = 120,

+        LastToken = 121,

 >LastToken : SyntaxKind
 
         FirstTriviaToken = 2,

@@ -1158,7 +1161,7 @@ declare module "typescript" {
         LastBinaryOperator = 63,

 >LastBinaryOperator : SyntaxKind
 
-        FirstNode = 121,

+        FirstNode = 122,

 >FirstNode : SyntaxKind
     }

     const enum NodeFlags {

@@ -3587,10 +3590,13 @@ declare module "typescript" {
         ContainsObjectLiteral = 524288,

 >ContainsObjectLiteral : TypeFlags
 
-        Intrinsic = 127,

+        ESSymbol = 1048576,

+>ESSymbol : TypeFlags
+
+        Intrinsic = 1048703,

 >Intrinsic : TypeFlags
 
-        Primitive = 510,

+        Primitive = 1049086,

 >Primitive : TypeFlags
 
         StringLike = 258,

diff --git a/tests/baselines/reference/ES5SymbolProperty1.errors.txt b/tests/baselines/reference/ES5SymbolProperty1.errors.txt
new file mode 100644
index 0000000000000..1c0c5a55ad25d
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty1.errors.txt
@@ -0,0 +1,19 @@
+tests/cases/conformance/Symbols/ES5SymbolProperty1.ts(7,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/Symbols/ES5SymbolProperty1.ts(7,6): error TS2471: A computed property name of the form 'Symbol.foo' must be of type 'symbol'.
+
+
+==== tests/cases/conformance/Symbols/ES5SymbolProperty1.ts (2 errors) ====
+    interface SymbolConstructor {
+        foo: string;
+    }
+    var Symbol: SymbolConstructor;
+    
+    var obj = {
+        [Symbol.foo]: 0
+        ~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~~~~~
+!!! error TS2471: A computed property name of the form 'Symbol.foo' must be of type 'symbol'.
+    }
+    
+    obj[Symbol.foo];
\ No newline at end of file
diff --git a/tests/baselines/reference/ES5SymbolProperty1.js b/tests/baselines/reference/ES5SymbolProperty1.js
new file mode 100644
index 0000000000000..3f761d3073fbb
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty1.js
@@ -0,0 +1,18 @@
+//// [ES5SymbolProperty1.ts]
+interface SymbolConstructor {
+    foo: string;
+}
+var Symbol: SymbolConstructor;
+
+var obj = {
+    [Symbol.foo]: 0
+}
+
+obj[Symbol.foo];
+
+//// [ES5SymbolProperty1.js]
+var Symbol;
+var obj = {
+    [Symbol.foo]: 0
+};
+obj[Symbol.foo];
diff --git a/tests/baselines/reference/ES5SymbolProperty2.errors.txt b/tests/baselines/reference/ES5SymbolProperty2.errors.txt
new file mode 100644
index 0000000000000..397e8f5151199
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty2.errors.txt
@@ -0,0 +1,22 @@
+tests/cases/conformance/Symbols/ES5SymbolProperty2.ts(5,9): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/Symbols/ES5SymbolProperty2.ts(5,10): error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+tests/cases/conformance/Symbols/ES5SymbolProperty2.ts(10,11): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/Symbols/ES5SymbolProperty2.ts (3 errors) ====
+    module M {
+        var Symbol;
+    
+        export class C {
+            [Symbol.iterator]() { }
+            ~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+             ~~~~~~~~~~~~~~~
+!!! error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+        }
+        (new C)[Symbol.iterator];
+    }
+    
+    (new M.C)[Symbol.iterator];
+              ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
\ No newline at end of file
diff --git a/tests/baselines/reference/ES5SymbolProperty2.js b/tests/baselines/reference/ES5SymbolProperty2.js
new file mode 100644
index 0000000000000..effd1e610f4c8
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty2.js
@@ -0,0 +1,26 @@
+//// [ES5SymbolProperty2.ts]
+module M {
+    var Symbol;
+
+    export class C {
+        [Symbol.iterator]() { }
+    }
+    (new C)[Symbol.iterator];
+}
+
+(new M.C)[Symbol.iterator];
+
+//// [ES5SymbolProperty2.js]
+var M;
+(function (M) {
+    var Symbol;
+    var C = (function () {
+        function C() {
+        }
+        C.prototype[Symbol.iterator] = function () { };
+        return C;
+    })();
+    M.C = C;
+    (new C)[Symbol.iterator];
+})(M || (M = {}));
+(new M.C)[Symbol.iterator];
diff --git a/tests/baselines/reference/ES5SymbolProperty3.errors.txt b/tests/baselines/reference/ES5SymbolProperty3.errors.txt
new file mode 100644
index 0000000000000..3ec09f889f593
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty3.errors.txt
@@ -0,0 +1,16 @@
+tests/cases/conformance/Symbols/ES5SymbolProperty3.ts(4,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/Symbols/ES5SymbolProperty3.ts(4,6): error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+
+
+==== tests/cases/conformance/Symbols/ES5SymbolProperty3.ts (2 errors) ====
+    var Symbol;
+    
+    class C {
+        [Symbol.iterator]() { }
+        ~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~~~~~~~~~~
+!!! error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+    }
+    
+    (new C)[Symbol.iterator]
\ No newline at end of file
diff --git a/tests/baselines/reference/ES5SymbolProperty3.js b/tests/baselines/reference/ES5SymbolProperty3.js
new file mode 100644
index 0000000000000..52ea7e091ee47
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty3.js
@@ -0,0 +1,18 @@
+//// [ES5SymbolProperty3.ts]
+var Symbol;
+
+class C {
+    [Symbol.iterator]() { }
+}
+
+(new C)[Symbol.iterator]
+
+//// [ES5SymbolProperty3.js]
+var Symbol;
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.iterator] = function () { };
+    return C;
+})();
+(new C)[Symbol.iterator];
diff --git a/tests/baselines/reference/ES5SymbolProperty4.errors.txt b/tests/baselines/reference/ES5SymbolProperty4.errors.txt
new file mode 100644
index 0000000000000..045647e0313f9
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty4.errors.txt
@@ -0,0 +1,16 @@
+tests/cases/conformance/Symbols/ES5SymbolProperty4.ts(4,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/Symbols/ES5SymbolProperty4.ts(4,6): error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+
+
+==== tests/cases/conformance/Symbols/ES5SymbolProperty4.ts (2 errors) ====
+    var Symbol: { iterator: string };
+    
+    class C {
+        [Symbol.iterator]() { }
+        ~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~~~~~~~~~~
+!!! error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+    }
+    
+    (new C)[Symbol.iterator]
\ No newline at end of file
diff --git a/tests/baselines/reference/ES5SymbolProperty4.js b/tests/baselines/reference/ES5SymbolProperty4.js
new file mode 100644
index 0000000000000..ae8a539f351e3
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty4.js
@@ -0,0 +1,18 @@
+//// [ES5SymbolProperty4.ts]
+var Symbol: { iterator: string };
+
+class C {
+    [Symbol.iterator]() { }
+}
+
+(new C)[Symbol.iterator]
+
+//// [ES5SymbolProperty4.js]
+var Symbol;
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.iterator] = function () { };
+    return C;
+})();
+(new C)[Symbol.iterator];
diff --git a/tests/baselines/reference/ES5SymbolProperty5.errors.txt b/tests/baselines/reference/ES5SymbolProperty5.errors.txt
new file mode 100644
index 0000000000000..7a94d1c4cda37
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty5.errors.txt
@@ -0,0 +1,16 @@
+tests/cases/conformance/Symbols/ES5SymbolProperty5.ts(4,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/Symbols/ES5SymbolProperty5.ts(7,1): error TS2346: Supplied parameters do not match any signature of call target.
+
+
+==== tests/cases/conformance/Symbols/ES5SymbolProperty5.ts (2 errors) ====
+    var Symbol: { iterator: symbol };
+    
+    class C {
+        [Symbol.iterator]() { }
+        ~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+    }
+    
+    (new C)[Symbol.iterator](0) // Should error
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2346: Supplied parameters do not match any signature of call target.
\ No newline at end of file
diff --git a/tests/baselines/reference/ES5SymbolProperty5.js b/tests/baselines/reference/ES5SymbolProperty5.js
new file mode 100644
index 0000000000000..63b12667d0fb2
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty5.js
@@ -0,0 +1,18 @@
+//// [ES5SymbolProperty5.ts]
+var Symbol: { iterator: symbol };
+
+class C {
+    [Symbol.iterator]() { }
+}
+
+(new C)[Symbol.iterator](0) // Should error
+
+//// [ES5SymbolProperty5.js]
+var Symbol;
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.iterator] = function () { };
+    return C;
+})();
+(new C)[Symbol.iterator](0); // Should error
diff --git a/tests/baselines/reference/ES5SymbolProperty6.errors.txt b/tests/baselines/reference/ES5SymbolProperty6.errors.txt
new file mode 100644
index 0000000000000..c86c13da05b1f
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty6.errors.txt
@@ -0,0 +1,17 @@
+tests/cases/conformance/Symbols/ES5SymbolProperty6.ts(2,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/Symbols/ES5SymbolProperty6.ts(2,6): error TS2304: Cannot find name 'Symbol'.
+tests/cases/conformance/Symbols/ES5SymbolProperty6.ts(5,9): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/Symbols/ES5SymbolProperty6.ts (3 errors) ====
+    class C {
+        [Symbol.iterator]() { }
+        ~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
+    }
+    
+    (new C)[Symbol.iterator]
+            ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
\ No newline at end of file
diff --git a/tests/baselines/reference/ES5SymbolProperty6.js b/tests/baselines/reference/ES5SymbolProperty6.js
new file mode 100644
index 0000000000000..10eda091e5e1a
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty6.js
@@ -0,0 +1,15 @@
+//// [ES5SymbolProperty6.ts]
+class C {
+    [Symbol.iterator]() { }
+}
+
+(new C)[Symbol.iterator]
+
+//// [ES5SymbolProperty6.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.iterator] = function () { };
+    return C;
+})();
+(new C)[Symbol.iterator];
diff --git a/tests/baselines/reference/ES5SymbolProperty7.errors.txt b/tests/baselines/reference/ES5SymbolProperty7.errors.txt
new file mode 100644
index 0000000000000..4b35618ad52ae
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty7.errors.txt
@@ -0,0 +1,16 @@
+tests/cases/conformance/Symbols/ES5SymbolProperty7.ts(4,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/Symbols/ES5SymbolProperty7.ts(4,6): error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+
+
+==== tests/cases/conformance/Symbols/ES5SymbolProperty7.ts (2 errors) ====
+    var Symbol: { iterator: any };
+    
+    class C {
+        [Symbol.iterator]() { }
+        ~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~~~~~~~~~~
+!!! error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+    }
+    
+    (new C)[Symbol.iterator]
\ No newline at end of file
diff --git a/tests/baselines/reference/ES5SymbolProperty7.js b/tests/baselines/reference/ES5SymbolProperty7.js
new file mode 100644
index 0000000000000..d3f796ce758fc
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolProperty7.js
@@ -0,0 +1,18 @@
+//// [ES5SymbolProperty7.ts]
+var Symbol: { iterator: any };
+
+class C {
+    [Symbol.iterator]() { }
+}
+
+(new C)[Symbol.iterator]
+
+//// [ES5SymbolProperty7.js]
+var Symbol;
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.iterator] = function () { };
+    return C;
+})();
+(new C)[Symbol.iterator];
diff --git a/tests/baselines/reference/ES5SymbolType1.js b/tests/baselines/reference/ES5SymbolType1.js
new file mode 100644
index 0000000000000..5b555c19e7ca9
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolType1.js
@@ -0,0 +1,7 @@
+//// [ES5SymbolType1.ts]
+var s: symbol;
+s.toString();
+
+//// [ES5SymbolType1.js]
+var s;
+s.toString();
diff --git a/tests/baselines/reference/ES5SymbolType1.types b/tests/baselines/reference/ES5SymbolType1.types
new file mode 100644
index 0000000000000..79d93902fd6a2
--- /dev/null
+++ b/tests/baselines/reference/ES5SymbolType1.types
@@ -0,0 +1,10 @@
+=== tests/cases/conformance/Symbols/ES5SymbolType1.ts ===
+var s: symbol;
+>s : symbol
+
+s.toString();
+>s.toString() : string
+>s.toString : () => string
+>s : symbol
+>toString : () => string
+
diff --git a/tests/baselines/reference/baseTypePrivateMemberClash.errors.txt b/tests/baselines/reference/baseTypePrivateMemberClash.errors.txt
index eca303ff72cda..28e6684469651 100644
--- a/tests/baselines/reference/baseTypePrivateMemberClash.errors.txt
+++ b/tests/baselines/reference/baseTypePrivateMemberClash.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/compiler/baseTypePrivateMemberClash.ts(8,11): error TS2320: Interface 'Z' cannot simultaneously extend types 'X' and 'Y'.
-  Named properties 'm' of types 'X' and 'Y' are not identical.
+  Named property 'm' of types 'X' and 'Y' are not identical.
 
 
 ==== tests/cases/compiler/baseTypePrivateMemberClash.ts (1 errors) ====
@@ -13,4 +13,4 @@ tests/cases/compiler/baseTypePrivateMemberClash.ts(8,11): error TS2320: Interfac
     interface Z extends X, Y { }
               ~
 !!! error TS2320: Interface 'Z' cannot simultaneously extend types 'X' and 'Y'.
-!!! error TS2320:   Named properties 'm' of types 'X' and 'Y' are not identical.
\ No newline at end of file
+!!! error TS2320:   Named property 'm' of types 'X' and 'Y' are not identical.
\ No newline at end of file
diff --git a/tests/baselines/reference/callSignaturesThatDifferOnlyByReturnType2.errors.txt b/tests/baselines/reference/callSignaturesThatDifferOnlyByReturnType2.errors.txt
index 5fabfd0b7adfe..4ff65843eba64 100644
--- a/tests/baselines/reference/callSignaturesThatDifferOnlyByReturnType2.errors.txt
+++ b/tests/baselines/reference/callSignaturesThatDifferOnlyByReturnType2.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/conformance/types/objectTypeLiteral/callSignatures/callSignaturesThatDifferOnlyByReturnType2.ts(8,11): error TS2320: Interface 'A' cannot simultaneously extend types 'I<number>' and 'I<string>'.
-  Named properties 'foo' of types 'I<number>' and 'I<string>' are not identical.
+  Named property 'foo' of types 'I<number>' and 'I<string>' are not identical.
 tests/cases/conformance/types/objectTypeLiteral/callSignatures/callSignaturesThatDifferOnlyByReturnType2.ts(13,16): error TS2345: Argument of type 'string' is not assignable to parameter of type 'number'.
 
 
@@ -14,7 +14,7 @@ tests/cases/conformance/types/objectTypeLiteral/callSignatures/callSignaturesTha
     interface A extends I<number>, I<string> { }
               ~
 !!! error TS2320: Interface 'A' cannot simultaneously extend types 'I<number>' and 'I<string>'.
-!!! error TS2320:   Named properties 'foo' of types 'I<number>' and 'I<string>' are not identical.
+!!! error TS2320:   Named property 'foo' of types 'I<number>' and 'I<string>' are not identical.
     
     var x: A;
     // BUG 822524
diff --git a/tests/baselines/reference/callWithSpread.errors.txt b/tests/baselines/reference/callWithSpread.errors.txt
index 7ea026f434662..a28d4c8b1a176 100644
--- a/tests/baselines/reference/callWithSpread.errors.txt
+++ b/tests/baselines/reference/callWithSpread.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/expressions/functionCalls/callWithSpread.ts(52,21): error TS2468: Spread operator in 'new' expressions is only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/expressions/functionCalls/callWithSpread.ts(52,21): error TS2472: Spread operator in 'new' expressions is only available when targeting ECMAScript 6 and higher.
 
 
 ==== tests/cases/conformance/expressions/functionCalls/callWithSpread.ts (1 errors) ====
@@ -55,5 +55,5 @@ tests/cases/conformance/expressions/functionCalls/callWithSpread.ts(52,21): erro
     // Only supported in when target is ES6
     var c = new C(1, 2, ...a);
                         ~~~~
-!!! error TS2468: Spread operator in 'new' expressions is only available when targeting ECMAScript 6 and higher.
+!!! error TS2472: Spread operator in 'new' expressions is only available when targeting ECMAScript 6 and higher.
     
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames12.errors.txt b/tests/baselines/reference/computedPropertyNames12.errors.txt
index 56774fe8daed5..1fdf741f8934f 100644
--- a/tests/baselines/reference/computedPropertyNames12.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames12.errors.txt
@@ -1,14 +1,14 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(5,5): error TS1166: Computed property names are not allowed in class property declarations.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(6,5): error TS1166: Computed property names are not allowed in class property declarations.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(7,12): error TS1166: Computed property names are not allowed in class property declarations.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(8,5): error TS1166: Computed property names are not allowed in class property declarations.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(9,5): error TS1166: Computed property names are not allowed in class property declarations.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(10,12): error TS1166: Computed property names are not allowed in class property declarations.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(11,5): error TS1166: Computed property names are not allowed in class property declarations.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(12,5): error TS1166: Computed property names are not allowed in class property declarations.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(13,12): error TS1166: Computed property names are not allowed in class property declarations.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(14,5): error TS1166: Computed property names are not allowed in class property declarations.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(15,12): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(5,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(6,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(7,12): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(8,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(9,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(10,12): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(11,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(12,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(13,12): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(14,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(15,12): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts (11 errors) ====
@@ -18,35 +18,35 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames12.ts(15,12)
     class C {
         [s]: number;
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         [n] = n;
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         static [s + s]: string;
                ~~~~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         [s + n] = 2;
         ~~~~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         [+s]: typeof s;
         ~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         static [""]: number;
                ~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         [0]: number;
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         [a]: number;
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         static [<any>true]: number;
                ~~~~~~~~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         [`hello bye`] = 0;
         ~~~~~~~~~~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         static [`hello ${a} bye`] = 0
                ~~~~~~~~~~~~~~~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames14.errors.txt b/tests/baselines/reference/computedPropertyNames14.errors.txt
index 1cf5b1445f23a..9ab0cf6a4e99b 100644
--- a/tests/baselines/reference/computedPropertyNames14.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames14.errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(3,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(4,12): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(5,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(6,12): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(7,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(8,12): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(3,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(4,12): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(5,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(6,12): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(7,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(8,12): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts (6 errors) ====
@@ -11,20 +11,20 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames14.ts(8,12):
     class C {
         [b]() {}
         ~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         static [true]() { }
                ~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         [[]]() { }
         ~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         static [{}]() { }
                ~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         [undefined]() { }
         ~~~~~~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         static [null]() { }
                ~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames15.errors.txt b/tests/baselines/reference/computedPropertyNames15.errors.txt
index 0e759668a9517..64b08df32217e 100644
--- a/tests/baselines/reference/computedPropertyNames15.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames15.errors.txt
@@ -1,5 +1,5 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames15.ts(6,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames15.ts(7,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames15.ts(6,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames15.ts(7,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames15.ts (2 errors) ====
@@ -10,8 +10,8 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames15.ts(7,5):
         [p1]() { }
         [p2]() { }
         ~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         [p3]() { }
         ~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames17.errors.txt b/tests/baselines/reference/computedPropertyNames17.errors.txt
index b236ae3245ede..df9fe01528aed 100644
--- a/tests/baselines/reference/computedPropertyNames17.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames17.errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(3,9): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(4,16): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(5,9): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(6,9): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(7,16): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(8,9): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(3,9): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(4,16): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(5,9): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(6,9): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(7,16): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(8,9): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts (6 errors) ====
@@ -11,20 +11,20 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames17.ts(8,9):
     class C {
         get [b]() { return 0;}
             ~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         static set [true](v) { }
                    ~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         get [[]]() { return 0; }
             ~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         set [{}](v) { }
             ~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         static get [undefined]() { return 0; }
                    ~~~~~~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         set [null](v) { }
             ~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames3.errors.txt b/tests/baselines/reference/computedPropertyNames3.errors.txt
index 080bff1ab9ab0..7136e441e720e 100644
--- a/tests/baselines/reference/computedPropertyNames3.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames3.errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(4,12): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(4,12): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(5,9): error TS2378: A 'get' accessor must return a value or consist of a single 'throw' statement.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(5,9): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(6,9): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(5,9): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(6,9): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(7,16): error TS2378: A 'get' accessor must return a value or consist of a single 'throw' statement.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(7,16): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(7,16): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts (6 errors) ====
@@ -12,19 +12,19 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames3.ts(7,16):
         [0 + 1]() { }
         static [() => { }]() { }
                ~~~~~~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         get [delete id]() { }
             ~~~~~~~~~~~
 !!! error TS2378: A 'get' accessor must return a value or consist of a single 'throw' statement.
             ~~~~~~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         set [[0, 1]](v) { }
             ~~~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         static get [<String>""]() { }
                    ~~~~~~~~~~~~
 !!! error TS2378: A 'get' accessor must return a value or consist of a single 'throw' statement.
                    ~~~~~~~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         static set [id.toString()](v) { }
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames32.errors.txt b/tests/baselines/reference/computedPropertyNames32.errors.txt
index e2f08c79fc906..63b13d40ab4f1 100644
--- a/tests/baselines/reference/computedPropertyNames32.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames32.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames32.ts(6,10): error TS2466: A computed property name cannot reference a type parameter from its containing type.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames32.ts(6,10): error TS2467: A computed property name cannot reference a type parameter from its containing type.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames32.ts (1 errors) ====
@@ -9,5 +9,5 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames32.ts(6,10):
         }
         [foo<T>()]() { }
              ~
-!!! error TS2466: A computed property name cannot reference a type parameter from its containing type.
+!!! error TS2467: A computed property name cannot reference a type parameter from its containing type.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames35.errors.txt b/tests/baselines/reference/computedPropertyNames35.errors.txt
index 01c4614e84a44..aa9279fe9c387 100644
--- a/tests/baselines/reference/computedPropertyNames35.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames35.errors.txt
@@ -1,5 +1,5 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames35.ts(4,5): error TS1169: Computed property names are not allowed in interfaces.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames35.ts(4,10): error TS2466: A computed property name cannot reference a type parameter from its containing type.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames35.ts(4,5): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames35.ts(4,10): error TS2467: A computed property name cannot reference a type parameter from its containing type.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames35.ts (2 errors) ====
@@ -8,7 +8,7 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames35.ts(4,10):
         bar(): string;
         [foo<T>()](): void;
         ~~~~~~~~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
              ~
-!!! error TS2466: A computed property name cannot reference a type parameter from its containing type.
+!!! error TS2467: A computed property name cannot reference a type parameter from its containing type.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames42.errors.txt b/tests/baselines/reference/computedPropertyNames42.errors.txt
index 059b3117a4397..417931c535f5b 100644
--- a/tests/baselines/reference/computedPropertyNames42.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames42.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames42.ts(8,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames42.ts(8,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/es6/computedProperties/computedPropertyNames42.ts(8,5): error TS2411: Property '[""]' of type 'Foo' is not assignable to string index type 'Foo2'.
 
 
@@ -12,7 +12,7 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames42.ts(8,5):
         // Computed properties
         [""]: Foo;
         ~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         ~~~~~~~~~~
 !!! error TS2411: Property '[""]' of type 'Foo' is not assignable to string index type 'Foo2'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames5.errors.txt b/tests/baselines/reference/computedPropertyNames5.errors.txt
index 2b8cf5503b851..2b59a816e16aa 100644
--- a/tests/baselines/reference/computedPropertyNames5.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames5.errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(3,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(4,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(5,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(6,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(7,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(8,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(3,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(4,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(5,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(6,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(7,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(8,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts (6 errors) ====
@@ -11,20 +11,20 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames5.ts(8,5): e
     var v = {
         [b]: 0,
         ~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         [true]: 1,
         ~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         [[]]: 0,
         ~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         [{}]: 0,
         ~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         [undefined]: undefined,
         ~~~~~~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         [null]: null
         ~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames6.errors.txt b/tests/baselines/reference/computedPropertyNames6.errors.txt
index 57798e9f6b678..1a651b581c3bc 100644
--- a/tests/baselines/reference/computedPropertyNames6.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames6.errors.txt
@@ -1,5 +1,5 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames6.ts(6,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames6.ts(7,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames6.ts(6,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames6.ts(7,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames6.ts (2 errors) ====
@@ -10,8 +10,8 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames6.ts(7,5): e
         [p1]: 0,
         [p2]: 1,
         ~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         [p3]: 2
         ~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames8.errors.txt b/tests/baselines/reference/computedPropertyNames8.errors.txt
index 515af1f4fc438..44e32e0a771d3 100644
--- a/tests/baselines/reference/computedPropertyNames8.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames8.errors.txt
@@ -1,5 +1,5 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames8.ts(5,9): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/es6/computedProperties/computedPropertyNames8.ts(6,9): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames8.ts(5,9): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames8.ts(6,9): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames8.ts (2 errors) ====
@@ -9,9 +9,9 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames8.ts(6,9): e
         var v = {
             [t]: 0,
             ~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
             [u]: 1
             ~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
         };
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNames9.errors.txt b/tests/baselines/reference/computedPropertyNames9.errors.txt
index d87576f1f778d..a71e0f5e8eb1f 100644
--- a/tests/baselines/reference/computedPropertyNames9.errors.txt
+++ b/tests/baselines/reference/computedPropertyNames9.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNames9.ts(9,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/es6/computedProperties/computedPropertyNames9.ts(9,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNames9.ts (1 errors) ====
@@ -12,5 +12,5 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNames9.ts(9,5): e
         [f(0)]: 0,
         [f(true)]: 0
         ~~~~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNamesDeclarationEmit3.errors.txt b/tests/baselines/reference/computedPropertyNamesDeclarationEmit3.errors.txt
index 69ff2b9e452c8..961b64a7f32eb 100644
--- a/tests/baselines/reference/computedPropertyNamesDeclarationEmit3.errors.txt
+++ b/tests/baselines/reference/computedPropertyNamesDeclarationEmit3.errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNamesDeclarationEmit3.ts(2,5): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/conformance/es6/computedProperties/computedPropertyNamesDeclarationEmit3.ts(2,5): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNamesDeclarationEmit3.ts (1 errors) ====
     interface I {
         ["" + ""](): void;
         ~~~~~~~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNamesDeclarationEmit4.errors.txt b/tests/baselines/reference/computedPropertyNamesDeclarationEmit4.errors.txt
index 53eb057f8a12e..45fa3ae521e3c 100644
--- a/tests/baselines/reference/computedPropertyNamesDeclarationEmit4.errors.txt
+++ b/tests/baselines/reference/computedPropertyNamesDeclarationEmit4.errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNamesDeclarationEmit4.ts(2,5): error TS1170: Computed property names are not allowed in type literals.
+tests/cases/conformance/es6/computedProperties/computedPropertyNamesDeclarationEmit4.ts(2,5): error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNamesDeclarationEmit4.ts (1 errors) ====
     var v: {
         ["" + ""](): void;
         ~~~~~~~~~
-!!! error TS1170: Computed property names are not allowed in type literals.
+!!! error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/computedPropertyNamesOnOverloads.errors.txt b/tests/baselines/reference/computedPropertyNamesOnOverloads.errors.txt
index b3c2957a13f36..ee7b67ad82905 100644
--- a/tests/baselines/reference/computedPropertyNamesOnOverloads.errors.txt
+++ b/tests/baselines/reference/computedPropertyNamesOnOverloads.errors.txt
@@ -1,5 +1,5 @@
-tests/cases/conformance/es6/computedProperties/computedPropertyNamesOnOverloads.ts(4,5): error TS1168: Computed property names are not allowed in method overloads.
-tests/cases/conformance/es6/computedProperties/computedPropertyNamesOnOverloads.ts(5,5): error TS1168: Computed property names are not allowed in method overloads.
+tests/cases/conformance/es6/computedProperties/computedPropertyNamesOnOverloads.ts(4,5): error TS1168: A computed property name in a method overload must directly refer to a built-in symbol.
+tests/cases/conformance/es6/computedProperties/computedPropertyNamesOnOverloads.ts(5,5): error TS1168: A computed property name in a method overload must directly refer to a built-in symbol.
 
 
 ==== tests/cases/conformance/es6/computedProperties/computedPropertyNamesOnOverloads.ts (2 errors) ====
@@ -8,9 +8,9 @@ tests/cases/conformance/es6/computedProperties/computedPropertyNamesOnOverloads.
     class C {
         [methodName](v: string);
         ~~~~~~~~~~~~
-!!! error TS1168: Computed property names are not allowed in method overloads.
+!!! error TS1168: A computed property name in a method overload must directly refer to a built-in symbol.
         [methodName]();
         ~~~~~~~~~~~~
-!!! error TS1168: Computed property names are not allowed in method overloads.
+!!! error TS1168: A computed property name in a method overload must directly refer to a built-in symbol.
         [methodName](v?: string) { }
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/conflictingMemberTypesInBases.errors.txt b/tests/baselines/reference/conflictingMemberTypesInBases.errors.txt
index 58fdcb4c7ae69..07e7a64ec1ff7 100644
--- a/tests/baselines/reference/conflictingMemberTypesInBases.errors.txt
+++ b/tests/baselines/reference/conflictingMemberTypesInBases.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/compiler/conflictingMemberTypesInBases.ts(12,11): error TS2320: Interface 'E' cannot simultaneously extend types 'B' and 'D'.
-  Named properties 'm' of types 'B' and 'D' are not identical.
+  Named property 'm' of types 'B' and 'D' are not identical.
 
 
 ==== tests/cases/compiler/conflictingMemberTypesInBases.ts (1 errors) ====
@@ -17,6 +17,6 @@ tests/cases/compiler/conflictingMemberTypesInBases.ts(12,11): error TS2320: Inte
     interface E extends B { } // Error here for extending B and D
               ~
 !!! error TS2320: Interface 'E' cannot simultaneously extend types 'B' and 'D'.
-!!! error TS2320:   Named properties 'm' of types 'B' and 'D' are not identical.
+!!! error TS2320:   Named property 'm' of types 'B' and 'D' are not identical.
     interface E extends D { } // No duplicate error here
     
\ No newline at end of file
diff --git a/tests/baselines/reference/constDeclarationShadowedByVarDeclaration.errors.txt b/tests/baselines/reference/constDeclarationShadowedByVarDeclaration.errors.txt
index ff669e41396bc..24af601139fb5 100644
--- a/tests/baselines/reference/constDeclarationShadowedByVarDeclaration.errors.txt
+++ b/tests/baselines/reference/constDeclarationShadowedByVarDeclaration.errors.txt
@@ -1,6 +1,6 @@
-tests/cases/compiler/constDeclarationShadowedByVarDeclaration.ts(7,9): error TS2477: Cannot initialize outer scoped variable 'x' in the same scope as block scoped declaration 'x'.
-tests/cases/compiler/constDeclarationShadowedByVarDeclaration.ts(15,13): error TS2477: Cannot initialize outer scoped variable 'y' in the same scope as block scoped declaration 'y'.
-tests/cases/compiler/constDeclarationShadowedByVarDeclaration.ts(22,7): error TS2477: Cannot initialize outer scoped variable 'z' in the same scope as block scoped declaration 'z'.
+tests/cases/compiler/constDeclarationShadowedByVarDeclaration.ts(7,9): error TS2481: Cannot initialize outer scoped variable 'x' in the same scope as block scoped declaration 'x'.
+tests/cases/compiler/constDeclarationShadowedByVarDeclaration.ts(15,13): error TS2481: Cannot initialize outer scoped variable 'y' in the same scope as block scoped declaration 'y'.
+tests/cases/compiler/constDeclarationShadowedByVarDeclaration.ts(22,7): error TS2481: Cannot initialize outer scoped variable 'z' in the same scope as block scoped declaration 'z'.
 
 
 ==== tests/cases/compiler/constDeclarationShadowedByVarDeclaration.ts (3 errors) ====
@@ -12,7 +12,7 @@ tests/cases/compiler/constDeclarationShadowedByVarDeclaration.ts(22,7): error TS
     
         var x = 0;
             ~
-!!! error TS2477: Cannot initialize outer scoped variable 'x' in the same scope as block scoped declaration 'x'.
+!!! error TS2481: Cannot initialize outer scoped variable 'x' in the same scope as block scoped declaration 'x'.
     }
     
     
@@ -22,7 +22,7 @@ tests/cases/compiler/constDeclarationShadowedByVarDeclaration.ts(22,7): error TS
         {
             var y = 0;
                 ~
-!!! error TS2477: Cannot initialize outer scoped variable 'y' in the same scope as block scoped declaration 'y'.
+!!! error TS2481: Cannot initialize outer scoped variable 'y' in the same scope as block scoped declaration 'y'.
         }
     }
     
@@ -31,5 +31,5 @@ tests/cases/compiler/constDeclarationShadowedByVarDeclaration.ts(22,7): error TS
       const z = 0;
       var z = 0
           ~
-!!! error TS2477: Cannot initialize outer scoped variable 'z' in the same scope as block scoped declaration 'z'.
+!!! error TS2481: Cannot initialize outer scoped variable 'z' in the same scope as block scoped declaration 'z'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/constEnumBadPropertyNames.errors.txt b/tests/baselines/reference/constEnumBadPropertyNames.errors.txt
index 52c78fa68aece..f2330617dea18 100644
--- a/tests/baselines/reference/constEnumBadPropertyNames.errors.txt
+++ b/tests/baselines/reference/constEnumBadPropertyNames.errors.txt
@@ -1,8 +1,8 @@
-tests/cases/compiler/constEnumBadPropertyNames.ts(2,11): error TS2475: Property 'B' does not exist on 'const' enum 'E'.
+tests/cases/compiler/constEnumBadPropertyNames.ts(2,11): error TS2479: Property 'B' does not exist on 'const' enum 'E'.
 
 
 ==== tests/cases/compiler/constEnumBadPropertyNames.ts (1 errors) ====
     const enum E { A }
     var x = E["B"]
               ~~~
-!!! error TS2475: Property 'B' does not exist on 'const' enum 'E'.
\ No newline at end of file
+!!! error TS2479: Property 'B' does not exist on 'const' enum 'E'.
\ No newline at end of file
diff --git a/tests/baselines/reference/constEnumErrors.errors.txt b/tests/baselines/reference/constEnumErrors.errors.txt
index edd3044f0bc00..be7dad54eeb52 100644
--- a/tests/baselines/reference/constEnumErrors.errors.txt
+++ b/tests/baselines/reference/constEnumErrors.errors.txt
@@ -1,16 +1,16 @@
 tests/cases/compiler/constEnumErrors.ts(1,12): error TS2300: Duplicate identifier 'E'.
 tests/cases/compiler/constEnumErrors.ts(5,8): error TS2300: Duplicate identifier 'E'.
-tests/cases/compiler/constEnumErrors.ts(12,9): error TS2470: In 'const' enum declarations member initializer must be constant expression.
-tests/cases/compiler/constEnumErrors.ts(14,9): error TS2470: In 'const' enum declarations member initializer must be constant expression.
-tests/cases/compiler/constEnumErrors.ts(15,10): error TS2470: In 'const' enum declarations member initializer must be constant expression.
-tests/cases/compiler/constEnumErrors.ts(22,13): error TS2472: A const enum member can only be accessed using a string literal.
-tests/cases/compiler/constEnumErrors.ts(24,13): error TS2472: A const enum member can only be accessed using a string literal.
-tests/cases/compiler/constEnumErrors.ts(26,9): error TS2471: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
-tests/cases/compiler/constEnumErrors.ts(27,10): error TS2471: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
-tests/cases/compiler/constEnumErrors.ts(32,5): error TS2471: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
-tests/cases/compiler/constEnumErrors.ts(40,9): error TS2473: 'const' enum member initializer was evaluated to a non-finite value.
-tests/cases/compiler/constEnumErrors.ts(41,9): error TS2473: 'const' enum member initializer was evaluated to a non-finite value.
-tests/cases/compiler/constEnumErrors.ts(42,9): error TS2474: 'const' enum member initializer was evaluated to disallowed value 'NaN'.
+tests/cases/compiler/constEnumErrors.ts(12,9): error TS2474: In 'const' enum declarations member initializer must be constant expression.
+tests/cases/compiler/constEnumErrors.ts(14,9): error TS2474: In 'const' enum declarations member initializer must be constant expression.
+tests/cases/compiler/constEnumErrors.ts(15,10): error TS2474: In 'const' enum declarations member initializer must be constant expression.
+tests/cases/compiler/constEnumErrors.ts(22,13): error TS2476: A const enum member can only be accessed using a string literal.
+tests/cases/compiler/constEnumErrors.ts(24,13): error TS2476: A const enum member can only be accessed using a string literal.
+tests/cases/compiler/constEnumErrors.ts(26,9): error TS2475: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
+tests/cases/compiler/constEnumErrors.ts(27,10): error TS2475: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
+tests/cases/compiler/constEnumErrors.ts(32,5): error TS2475: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
+tests/cases/compiler/constEnumErrors.ts(40,9): error TS2477: 'const' enum member initializer was evaluated to a non-finite value.
+tests/cases/compiler/constEnumErrors.ts(41,9): error TS2477: 'const' enum member initializer was evaluated to a non-finite value.
+tests/cases/compiler/constEnumErrors.ts(42,9): error TS2478: 'const' enum member initializer was evaluated to disallowed value 'NaN'.
 
 
 ==== tests/cases/compiler/constEnumErrors.ts (13 errors) ====
@@ -31,14 +31,14 @@ tests/cases/compiler/constEnumErrors.ts(42,9): error TS2474: 'const' enum member
         // forward reference to the element of the same enum
         X = Y, 
             ~
-!!! error TS2470: In 'const' enum declarations member initializer must be constant expression.
+!!! error TS2474: In 'const' enum declarations member initializer must be constant expression.
         // forward reference to the element of the same enum
         Y = E1.Z,
             ~~~~
-!!! error TS2470: In 'const' enum declarations member initializer must be constant expression.
+!!! error TS2474: In 'const' enum declarations member initializer must be constant expression.
         Y1 = E1["Z"]
              ~~~~~~~
-!!! error TS2470: In 'const' enum declarations member initializer must be constant expression.
+!!! error TS2474: In 'const' enum declarations member initializer must be constant expression.
     }
     
     const enum E2 {
@@ -47,25 +47,25 @@ tests/cases/compiler/constEnumErrors.ts(42,9): error TS2474: 'const' enum member
     
     var y0 = E2[1]
                 ~
-!!! error TS2472: A const enum member can only be accessed using a string literal.
+!!! error TS2476: A const enum member can only be accessed using a string literal.
     var name = "A";
     var y1 = E2[name];
                 ~~~~
-!!! error TS2472: A const enum member can only be accessed using a string literal.
+!!! error TS2476: A const enum member can only be accessed using a string literal.
     
     var x = E2;
             ~~
-!!! error TS2471: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
+!!! error TS2475: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
     var y = [E2];
              ~~
-!!! error TS2471: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
+!!! error TS2475: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
     
     function foo(t: any): void {
     }
     
     foo(E2);
         ~~
-!!! error TS2471: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
+!!! error TS2475: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment.
     
     const enum NaNOrInfinity {
         A = 9007199254740992,
@@ -75,11 +75,11 @@ tests/cases/compiler/constEnumErrors.ts(42,9): error TS2474: 'const' enum member
         E = D * D,
         F = E * E, // overflow
             ~~~~~
-!!! error TS2473: 'const' enum member initializer was evaluated to a non-finite value.
+!!! error TS2477: 'const' enum member initializer was evaluated to a non-finite value.
         G = 1 / 0, // overflow
             ~~~~~
-!!! error TS2473: 'const' enum member initializer was evaluated to a non-finite value.
+!!! error TS2477: 'const' enum member initializer was evaluated to a non-finite value.
         H = 0 / 0  // NaN
             ~~~~~
-!!! error TS2474: 'const' enum member initializer was evaluated to disallowed value 'NaN'.
+!!! error TS2478: 'const' enum member initializer was evaluated to disallowed value 'NaN'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/genericAndNonGenericInheritedSignature1.errors.txt b/tests/baselines/reference/genericAndNonGenericInheritedSignature1.errors.txt
index 63ff9d9313e7c..7180dc7c25bb1 100644
--- a/tests/baselines/reference/genericAndNonGenericInheritedSignature1.errors.txt
+++ b/tests/baselines/reference/genericAndNonGenericInheritedSignature1.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/compiler/genericAndNonGenericInheritedSignature1.ts(7,11): error TS2320: Interface 'Hello' cannot simultaneously extend types 'Foo' and 'Bar'.
-  Named properties 'f' of types 'Foo' and 'Bar' are not identical.
+  Named property 'f' of types 'Foo' and 'Bar' are not identical.
 
 
 ==== tests/cases/compiler/genericAndNonGenericInheritedSignature1.ts (1 errors) ====
@@ -12,6 +12,6 @@ tests/cases/compiler/genericAndNonGenericInheritedSignature1.ts(7,11): error TS2
     interface Hello extends Foo, Bar {
               ~~~~~
 !!! error TS2320: Interface 'Hello' cannot simultaneously extend types 'Foo' and 'Bar'.
-!!! error TS2320:   Named properties 'f' of types 'Foo' and 'Bar' are not identical.
+!!! error TS2320:   Named property 'f' of types 'Foo' and 'Bar' are not identical.
     }
     
\ No newline at end of file
diff --git a/tests/baselines/reference/genericAndNonGenericInheritedSignature2.errors.txt b/tests/baselines/reference/genericAndNonGenericInheritedSignature2.errors.txt
index 05fdd68319e66..158fd44792309 100644
--- a/tests/baselines/reference/genericAndNonGenericInheritedSignature2.errors.txt
+++ b/tests/baselines/reference/genericAndNonGenericInheritedSignature2.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/compiler/genericAndNonGenericInheritedSignature2.ts(7,11): error TS2320: Interface 'Hello' cannot simultaneously extend types 'Bar' and 'Foo'.
-  Named properties 'f' of types 'Bar' and 'Foo' are not identical.
+  Named property 'f' of types 'Bar' and 'Foo' are not identical.
 
 
 ==== tests/cases/compiler/genericAndNonGenericInheritedSignature2.ts (1 errors) ====
@@ -12,6 +12,6 @@ tests/cases/compiler/genericAndNonGenericInheritedSignature2.ts(7,11): error TS2
     interface Hello extends Bar, Foo {
               ~~~~~
 !!! error TS2320: Interface 'Hello' cannot simultaneously extend types 'Bar' and 'Foo'.
-!!! error TS2320:   Named properties 'f' of types 'Bar' and 'Foo' are not identical.
+!!! error TS2320:   Named property 'f' of types 'Bar' and 'Foo' are not identical.
     }
     
\ No newline at end of file
diff --git a/tests/baselines/reference/giant.errors.txt b/tests/baselines/reference/giant.errors.txt
index e8c574d211585..1d623870d63de 100644
--- a/tests/baselines/reference/giant.errors.txt
+++ b/tests/baselines/reference/giant.errors.txt
@@ -16,7 +16,7 @@ tests/cases/compiler/giant.ts(34,16): error TS2300: Duplicate identifier 'tsF'.
 tests/cases/compiler/giant.ts(35,12): error TS2300: Duplicate identifier 'tgF'.
 tests/cases/compiler/giant.ts(36,16): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.
 tests/cases/compiler/giant.ts(36,16): error TS2300: Duplicate identifier 'tgF'.
-tests/cases/compiler/giant.ts(61,5): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/compiler/giant.ts(61,5): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/compiler/giant.ts(61,6): error TS2304: Cannot find name 'p'.
 tests/cases/compiler/giant.ts(62,5): error TS1021: An index signature must have a type annotation.
 tests/cases/compiler/giant.ts(63,6): error TS1096: An index signature must have exactly one parameter.
@@ -39,7 +39,7 @@ tests/cases/compiler/giant.ts(98,20): error TS2300: Duplicate identifier 'tsF'.
 tests/cases/compiler/giant.ts(99,16): error TS2300: Duplicate identifier 'tgF'.
 tests/cases/compiler/giant.ts(100,20): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.
 tests/cases/compiler/giant.ts(100,20): error TS2300: Duplicate identifier 'tgF'.
-tests/cases/compiler/giant.ts(125,9): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/compiler/giant.ts(125,9): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/compiler/giant.ts(125,10): error TS2304: Cannot find name 'p'.
 tests/cases/compiler/giant.ts(126,9): error TS1021: An index signature must have a type annotation.
 tests/cases/compiler/giant.ts(127,10): error TS1096: An index signature must have exactly one parameter.
@@ -63,7 +63,7 @@ tests/cases/compiler/giant.ts(177,20): error TS2300: Duplicate identifier 'tsF'.
 tests/cases/compiler/giant.ts(178,16): error TS2300: Duplicate identifier 'tgF'.
 tests/cases/compiler/giant.ts(179,20): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.
 tests/cases/compiler/giant.ts(179,20): error TS2300: Duplicate identifier 'tgF'.
-tests/cases/compiler/giant.ts(204,9): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/compiler/giant.ts(204,9): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/compiler/giant.ts(204,10): error TS2304: Cannot find name 'p'.
 tests/cases/compiler/giant.ts(205,9): error TS1021: An index signature must have a type annotation.
 tests/cases/compiler/giant.ts(206,10): error TS1096: An index signature must have exactly one parameter.
@@ -119,7 +119,7 @@ tests/cases/compiler/giant.ts(292,16): error TS2300: Duplicate identifier 'tsF'.
 tests/cases/compiler/giant.ts(293,12): error TS2300: Duplicate identifier 'tgF'.
 tests/cases/compiler/giant.ts(294,16): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.
 tests/cases/compiler/giant.ts(294,16): error TS2300: Duplicate identifier 'tgF'.
-tests/cases/compiler/giant.ts(319,5): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/compiler/giant.ts(319,5): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/compiler/giant.ts(319,6): error TS2304: Cannot find name 'p'.
 tests/cases/compiler/giant.ts(320,5): error TS1021: An index signature must have a type annotation.
 tests/cases/compiler/giant.ts(321,6): error TS1096: An index signature must have exactly one parameter.
@@ -142,7 +142,7 @@ tests/cases/compiler/giant.ts(356,20): error TS2300: Duplicate identifier 'tsF'.
 tests/cases/compiler/giant.ts(357,16): error TS2300: Duplicate identifier 'tgF'.
 tests/cases/compiler/giant.ts(358,20): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.
 tests/cases/compiler/giant.ts(358,20): error TS2300: Duplicate identifier 'tgF'.
-tests/cases/compiler/giant.ts(383,9): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/compiler/giant.ts(383,9): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/compiler/giant.ts(383,10): error TS2304: Cannot find name 'p'.
 tests/cases/compiler/giant.ts(384,9): error TS1021: An index signature must have a type annotation.
 tests/cases/compiler/giant.ts(385,10): error TS1096: An index signature must have exactly one parameter.
@@ -166,7 +166,7 @@ tests/cases/compiler/giant.ts(435,20): error TS2300: Duplicate identifier 'tsF'.
 tests/cases/compiler/giant.ts(436,16): error TS2300: Duplicate identifier 'tgF'.
 tests/cases/compiler/giant.ts(437,20): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.
 tests/cases/compiler/giant.ts(437,20): error TS2300: Duplicate identifier 'tgF'.
-tests/cases/compiler/giant.ts(462,9): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/compiler/giant.ts(462,9): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/compiler/giant.ts(462,10): error TS2304: Cannot find name 'p'.
 tests/cases/compiler/giant.ts(463,9): error TS1021: An index signature must have a type annotation.
 tests/cases/compiler/giant.ts(464,10): error TS1096: An index signature must have exactly one parameter.
@@ -238,7 +238,7 @@ tests/cases/compiler/giant.ts(556,21): error TS1036: Statements are not allowed
 tests/cases/compiler/giant.ts(558,24): error TS1184: An implementation cannot be declared in ambient contexts.
 tests/cases/compiler/giant.ts(561,21): error TS1184: An implementation cannot be declared in ambient contexts.
 tests/cases/compiler/giant.ts(563,21): error TS1184: An implementation cannot be declared in ambient contexts.
-tests/cases/compiler/giant.ts(587,9): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/compiler/giant.ts(587,9): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/compiler/giant.ts(587,10): error TS2304: Cannot find name 'p'.
 tests/cases/compiler/giant.ts(588,9): error TS1021: An index signature must have a type annotation.
 tests/cases/compiler/giant.ts(589,10): error TS1096: An index signature must have exactly one parameter.
@@ -255,7 +255,7 @@ tests/cases/compiler/giant.ts(621,26): error TS1184: An implementation cannot be
 tests/cases/compiler/giant.ts(623,24): error TS1184: An implementation cannot be declared in ambient contexts.
 tests/cases/compiler/giant.ts(626,21): error TS1184: An implementation cannot be declared in ambient contexts.
 tests/cases/compiler/giant.ts(628,21): error TS1184: An implementation cannot be declared in ambient contexts.
-tests/cases/compiler/giant.ts(653,9): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/compiler/giant.ts(653,9): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/compiler/giant.ts(653,10): error TS2304: Cannot find name 'p'.
 tests/cases/compiler/giant.ts(654,9): error TS1021: An index signature must have a type annotation.
 tests/cases/compiler/giant.ts(655,10): error TS1096: An index signature must have exactly one parameter.
@@ -364,7 +364,7 @@ tests/cases/compiler/giant.ts(676,30): error TS1184: An implementation cannot be
         //Index Signature
         [p];
         ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'p'.
         [p1: string];
@@ -474,7 +474,7 @@ tests/cases/compiler/giant.ts(676,30): error TS1184: An implementation cannot be
             //Index Signature
             [p];
             ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
              ~
 !!! error TS2304: Cannot find name 'p'.
             [p1: string];
@@ -601,7 +601,7 @@ tests/cases/compiler/giant.ts(676,30): error TS1184: An implementation cannot be
             //Index Signature
             [p];
             ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
              ~
 !!! error TS2304: Cannot find name 'p'.
             [p1: string];
@@ -828,7 +828,7 @@ tests/cases/compiler/giant.ts(676,30): error TS1184: An implementation cannot be
         //Index Signature
         [p];
         ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'p'.
         [p1: string];
@@ -938,7 +938,7 @@ tests/cases/compiler/giant.ts(676,30): error TS1184: An implementation cannot be
             //Index Signature
             [p];
             ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
              ~
 !!! error TS2304: Cannot find name 'p'.
             [p1: string];
@@ -1065,7 +1065,7 @@ tests/cases/compiler/giant.ts(676,30): error TS1184: An implementation cannot be
             //Index Signature
             [p];
             ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
              ~
 !!! error TS2304: Cannot find name 'p'.
             [p1: string];
@@ -1334,7 +1334,7 @@ tests/cases/compiler/giant.ts(676,30): error TS1184: An implementation cannot be
             //Index Signature
             [p];
             ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
              ~
 !!! error TS2304: Cannot find name 'p'.
             [p1: string];
@@ -1434,7 +1434,7 @@ tests/cases/compiler/giant.ts(676,30): error TS1184: An implementation cannot be
             //Index Signature
             [p];
             ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
              ~
 !!! error TS2304: Cannot find name 'p'.
             [p1: string];
diff --git a/tests/baselines/reference/inOperatorWithInvalidOperands.errors.txt b/tests/baselines/reference/inOperatorWithInvalidOperands.errors.txt
index 9df5357767f17..0985157e0da73 100644
--- a/tests/baselines/reference/inOperatorWithInvalidOperands.errors.txt
+++ b/tests/baselines/reference/inOperatorWithInvalidOperands.errors.txt
@@ -1,10 +1,10 @@
-tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(12,11): error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
-tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(13,11): error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
-tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(14,11): error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
-tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(16,11): error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
-tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(17,11): error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
-tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(19,11): error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
-tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(20,11): error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(12,11): error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
+tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(13,11): error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
+tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(14,11): error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
+tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(16,11): error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
+tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(17,11): error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
+tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(19,11): error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
+tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(20,11): error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
 tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(30,16): error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
 tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(31,16): error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
 tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(32,16): error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
@@ -15,7 +15,7 @@ tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInv
 tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(37,16): error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
 tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(38,16): error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
 tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(39,17): error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
-tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(43,11): error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(43,11): error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
 tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands.ts(43,17): error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
 
 
@@ -33,27 +33,27 @@ tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInv
     
     var ra1 = a1 in x;
               ~~
-!!! error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+!!! error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
     var ra2 = a2 in x;
               ~~
-!!! error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+!!! error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
     var ra3 = a3 in x;
               ~~
-!!! error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+!!! error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
     var ra4 = a4 in x;
     var ra5 = null in x;
               ~~~~
-!!! error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+!!! error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
     var ra6 = undefined in x;
               ~~~~~~~~~
-!!! error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+!!! error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
     var ra7 = E.a in x;
     var ra8 = false in x;
               ~~~~~
-!!! error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+!!! error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
     var ra9 = {} in x;
               ~~
-!!! error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+!!! error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
     
     // invalid right operands
     // the right operand is required to be of type Any, an object type, or a type parameter type
@@ -98,6 +98,6 @@ tests/cases/conformance/expressions/binaryOperators/inOperator/inOperatorWithInv
     // both operands are invalid
     var rc1 = {} in '';
               ~~
-!!! error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+!!! error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
                     ~~
 !!! error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
\ No newline at end of file
diff --git a/tests/baselines/reference/indexSignatureMustHaveTypeAnnotation.errors.txt b/tests/baselines/reference/indexSignatureMustHaveTypeAnnotation.errors.txt
index 82e96bf3846cb..88e09d7746b92 100644
--- a/tests/baselines/reference/indexSignatureMustHaveTypeAnnotation.errors.txt
+++ b/tests/baselines/reference/indexSignatureMustHaveTypeAnnotation.errors.txt
@@ -1,7 +1,7 @@
-tests/cases/compiler/indexSignatureMustHaveTypeAnnotation.ts(3,5): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/compiler/indexSignatureMustHaveTypeAnnotation.ts(3,5): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/compiler/indexSignatureMustHaveTypeAnnotation.ts(3,6): error TS2304: Cannot find name 'x'.
 tests/cases/compiler/indexSignatureMustHaveTypeAnnotation.ts(4,5): error TS1021: An index signature must have a type annotation.
-tests/cases/compiler/indexSignatureMustHaveTypeAnnotation.ts(9,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/compiler/indexSignatureMustHaveTypeAnnotation.ts(9,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/compiler/indexSignatureMustHaveTypeAnnotation.ts(9,6): error TS2304: Cannot find name 'x'.
 tests/cases/compiler/indexSignatureMustHaveTypeAnnotation.ts(14,5): error TS1021: An index signature must have a type annotation.
 
@@ -11,7 +11,7 @@ tests/cases/compiler/indexSignatureMustHaveTypeAnnotation.ts(14,5): error TS1021
         // Used to be indexer, now it is a computed property
         [x]: string;
         ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'x'.
         [x: string];
@@ -23,7 +23,7 @@ tests/cases/compiler/indexSignatureMustHaveTypeAnnotation.ts(14,5): error TS1021
         // Used to be indexer, now it is a computed property
         [x]: string
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'x'.
         
diff --git a/tests/baselines/reference/indexSignatureWithInitializer.errors.txt b/tests/baselines/reference/indexSignatureWithInitializer.errors.txt
index d6f547a25cb03..4a49de69393ac 100644
--- a/tests/baselines/reference/indexSignatureWithInitializer.errors.txt
+++ b/tests/baselines/reference/indexSignatureWithInitializer.errors.txt
@@ -1,6 +1,6 @@
-tests/cases/compiler/indexSignatureWithInitializer.ts(3,5): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/compiler/indexSignatureWithInitializer.ts(3,5): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/compiler/indexSignatureWithInitializer.ts(3,6): error TS2304: Cannot find name 'x'.
-tests/cases/compiler/indexSignatureWithInitializer.ts(7,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/compiler/indexSignatureWithInitializer.ts(7,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/compiler/indexSignatureWithInitializer.ts(7,6): error TS2304: Cannot find name 'x'.
 
 
@@ -9,7 +9,7 @@ tests/cases/compiler/indexSignatureWithInitializer.ts(7,6): error TS2304: Cannot
     interface I {
         [x = '']: string;
         ~~~~~~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'x'.
     }
@@ -17,7 +17,7 @@ tests/cases/compiler/indexSignatureWithInitializer.ts(7,6): error TS2304: Cannot
     class C {
         [x = 0]: string
         ~~~~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'x'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/indexTypeCheck.errors.txt b/tests/baselines/reference/indexTypeCheck.errors.txt
index 03d0e2ce8edbd..9f4b403ca2ec5 100644
--- a/tests/baselines/reference/indexTypeCheck.errors.txt
+++ b/tests/baselines/reference/indexTypeCheck.errors.txt
@@ -5,7 +5,7 @@ tests/cases/compiler/indexTypeCheck.ts(22,2): error TS2413: Numeric index type '
 tests/cases/compiler/indexTypeCheck.ts(27,2): error TS2413: Numeric index type 'number' is not assignable to string index type 'string'.
 tests/cases/compiler/indexTypeCheck.ts(32,3): error TS1096: An index signature must have exactly one parameter.
 tests/cases/compiler/indexTypeCheck.ts(36,3): error TS1023: An index signature parameter type must be 'string' or 'number'.
-tests/cases/compiler/indexTypeCheck.ts(51,1): error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
+tests/cases/compiler/indexTypeCheck.ts(51,1): error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
 
 
 ==== tests/cases/compiler/indexTypeCheck.ts (8 errors) ====
@@ -75,7 +75,7 @@ tests/cases/compiler/indexTypeCheck.ts(51,1): error TS2342: An index expression
     
     yellow[blue]; // error
     ~~~~~~~~~~~~
-!!! error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
+!!! error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
     
     var x:number[];
     x[0];
diff --git a/tests/baselines/reference/indexWithoutParamType2.errors.txt b/tests/baselines/reference/indexWithoutParamType2.errors.txt
index 468368b5f23d4..7e72b7804e29c 100644
--- a/tests/baselines/reference/indexWithoutParamType2.errors.txt
+++ b/tests/baselines/reference/indexWithoutParamType2.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/compiler/indexWithoutParamType2.ts(3,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/compiler/indexWithoutParamType2.ts(3,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/compiler/indexWithoutParamType2.ts(3,6): error TS2304: Cannot find name 'x'.
 
 
@@ -7,7 +7,7 @@ tests/cases/compiler/indexWithoutParamType2.ts(3,6): error TS2304: Cannot find n
         // Used to be indexer, now it is a computed property
         [x]: string
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'x'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/inheritSameNamePrivatePropertiesFromDifferentOrigins.errors.txt b/tests/baselines/reference/inheritSameNamePrivatePropertiesFromDifferentOrigins.errors.txt
index 555349cc2514c..e8c47e95fe9c8 100644
--- a/tests/baselines/reference/inheritSameNamePrivatePropertiesFromDifferentOrigins.errors.txt
+++ b/tests/baselines/reference/inheritSameNamePrivatePropertiesFromDifferentOrigins.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/compiler/inheritSameNamePrivatePropertiesFromDifferentOrigins.ts(9,11): error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
-  Named properties 'x' of types 'C' and 'C2' are not identical.
+  Named property 'x' of types 'C' and 'C2' are not identical.
 
 
 ==== tests/cases/compiler/inheritSameNamePrivatePropertiesFromDifferentOrigins.ts (1 errors) ====
@@ -14,6 +14,6 @@ tests/cases/compiler/inheritSameNamePrivatePropertiesFromDifferentOrigins.ts(9,1
     interface A extends C, C2 { // error
               ~
 !!! error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
-!!! error TS2320:   Named properties 'x' of types 'C' and 'C2' are not identical.
+!!! error TS2320:   Named property 'x' of types 'C' and 'C2' are not identical.
         y: string;
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/inheritSameNamePropertiesWithDifferentOptionality.errors.txt b/tests/baselines/reference/inheritSameNamePropertiesWithDifferentOptionality.errors.txt
index 3f9c4a3bae0d4..f6debbde7eca4 100644
--- a/tests/baselines/reference/inheritSameNamePropertiesWithDifferentOptionality.errors.txt
+++ b/tests/baselines/reference/inheritSameNamePropertiesWithDifferentOptionality.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/compiler/inheritSameNamePropertiesWithDifferentOptionality.ts(9,11): error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
-  Named properties 'x' of types 'C' and 'C2' are not identical.
+  Named property 'x' of types 'C' and 'C2' are not identical.
 
 
 ==== tests/cases/compiler/inheritSameNamePropertiesWithDifferentOptionality.ts (1 errors) ====
@@ -14,6 +14,6 @@ tests/cases/compiler/inheritSameNamePropertiesWithDifferentOptionality.ts(9,11):
     interface A extends C, C2 { // error
               ~
 !!! error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
-!!! error TS2320:   Named properties 'x' of types 'C' and 'C2' are not identical.
+!!! error TS2320:   Named property 'x' of types 'C' and 'C2' are not identical.
         y: string;
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/inheritSameNamePropertiesWithDifferentVisibility.errors.txt b/tests/baselines/reference/inheritSameNamePropertiesWithDifferentVisibility.errors.txt
index 9864b4a47926d..1865e9f6b7823 100644
--- a/tests/baselines/reference/inheritSameNamePropertiesWithDifferentVisibility.errors.txt
+++ b/tests/baselines/reference/inheritSameNamePropertiesWithDifferentVisibility.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/compiler/inheritSameNamePropertiesWithDifferentVisibility.ts(9,11): error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
-  Named properties 'x' of types 'C' and 'C2' are not identical.
+  Named property 'x' of types 'C' and 'C2' are not identical.
 
 
 ==== tests/cases/compiler/inheritSameNamePropertiesWithDifferentVisibility.ts (1 errors) ====
@@ -14,6 +14,6 @@ tests/cases/compiler/inheritSameNamePropertiesWithDifferentVisibility.ts(9,11):
     interface A extends C, C2 { // error
               ~
 !!! error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
-!!! error TS2320:   Named properties 'x' of types 'C' and 'C2' are not identical.
+!!! error TS2320:   Named property 'x' of types 'C' and 'C2' are not identical.
         y: string;
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/interfaceDeclaration1.errors.txt b/tests/baselines/reference/interfaceDeclaration1.errors.txt
index 1e8cc0c1e68f9..b73cfef75dfaa 100644
--- a/tests/baselines/reference/interfaceDeclaration1.errors.txt
+++ b/tests/baselines/reference/interfaceDeclaration1.errors.txt
@@ -7,7 +7,7 @@ tests/cases/compiler/interfaceDeclaration1.ts(35,7): error TS2420: Class 'C1' in
   Property 'prototype' is missing in type 'C1'.
 tests/cases/compiler/interfaceDeclaration1.ts(41,11): error TS2310: Type 'i8' recursively references itself as a base type.
 tests/cases/compiler/interfaceDeclaration1.ts(52,11): error TS2320: Interface 'i12' cannot simultaneously extend types 'i10' and 'i11'.
-  Named properties 'foo' of types 'i10' and 'i11' are not identical.
+  Named property 'foo' of types 'i10' and 'i11' are not identical.
 
 
 ==== tests/cases/compiler/interfaceDeclaration1.ts (8 errors) ====
@@ -80,5 +80,5 @@ tests/cases/compiler/interfaceDeclaration1.ts(52,11): error TS2320: Interface 'i
     interface i12 extends i10, i11 { }
               ~~~
 !!! error TS2320: Interface 'i12' cannot simultaneously extend types 'i10' and 'i11'.
-!!! error TS2320:   Named properties 'foo' of types 'i10' and 'i11' are not identical.
+!!! error TS2320:   Named property 'foo' of types 'i10' and 'i11' are not identical.
     
\ No newline at end of file
diff --git a/tests/baselines/reference/interfaceExtendingClassWithPrivates2.errors.txt b/tests/baselines/reference/interfaceExtendingClassWithPrivates2.errors.txt
index c9be8471e8c8b..7850c10fe2666 100644
--- a/tests/baselines/reference/interfaceExtendingClassWithPrivates2.errors.txt
+++ b/tests/baselines/reference/interfaceExtendingClassWithPrivates2.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/conformance/interfaces/interfacesExtendingClasses/interfaceExtendingClassWithPrivates2.ts(9,11): error TS2320: Interface 'I3' cannot simultaneously extend types 'Foo' and 'Bar'.
-  Named properties 'x' of types 'Foo' and 'Bar' are not identical.
+  Named property 'x' of types 'Foo' and 'Bar' are not identical.
 tests/cases/conformance/interfaces/interfacesExtendingClasses/interfaceExtendingClassWithPrivates2.ts(12,11): error TS2430: Interface 'I4' incorrectly extends interface 'Bar'.
   Property 'x' is private in type 'Bar' but not in type 'I4'.
 tests/cases/conformance/interfaces/interfacesExtendingClasses/interfaceExtendingClassWithPrivates2.ts(12,11): error TS2430: Interface 'I4' incorrectly extends interface 'Foo'.
@@ -20,7 +20,7 @@ tests/cases/conformance/interfaces/interfacesExtendingClasses/interfaceExtending
     interface I3 extends Foo, Bar { // error
               ~~
 !!! error TS2320: Interface 'I3' cannot simultaneously extend types 'Foo' and 'Bar'.
-!!! error TS2320:   Named properties 'x' of types 'Foo' and 'Bar' are not identical.
+!!! error TS2320:   Named property 'x' of types 'Foo' and 'Bar' are not identical.
     }
     
     interface I4 extends Foo, Bar { // error
diff --git a/tests/baselines/reference/interfaceExtendingClassWithProtecteds2.errors.txt b/tests/baselines/reference/interfaceExtendingClassWithProtecteds2.errors.txt
index a63dfd6efca79..48e3b7d7e6c7e 100644
--- a/tests/baselines/reference/interfaceExtendingClassWithProtecteds2.errors.txt
+++ b/tests/baselines/reference/interfaceExtendingClassWithProtecteds2.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/conformance/interfaces/interfacesExtendingClasses/interfaceExtendingClassWithProtecteds2.ts(9,11): error TS2320: Interface 'I3' cannot simultaneously extend types 'Foo' and 'Bar'.
-  Named properties 'x' of types 'Foo' and 'Bar' are not identical.
+  Named property 'x' of types 'Foo' and 'Bar' are not identical.
 tests/cases/conformance/interfaces/interfacesExtendingClasses/interfaceExtendingClassWithProtecteds2.ts(12,11): error TS2430: Interface 'I4' incorrectly extends interface 'Bar'.
   Property 'x' is protected but type 'I4' is not a class derived from 'Bar'.
 tests/cases/conformance/interfaces/interfacesExtendingClasses/interfaceExtendingClassWithProtecteds2.ts(12,11): error TS2430: Interface 'I4' incorrectly extends interface 'Foo'.
@@ -20,7 +20,7 @@ tests/cases/conformance/interfaces/interfacesExtendingClasses/interfaceExtending
     interface I3 extends Foo, Bar { // error
               ~~
 !!! error TS2320: Interface 'I3' cannot simultaneously extend types 'Foo' and 'Bar'.
-!!! error TS2320:   Named properties 'x' of types 'Foo' and 'Bar' are not identical.
+!!! error TS2320:   Named property 'x' of types 'Foo' and 'Bar' are not identical.
     }
     
     interface I4 extends Foo, Bar { // error
diff --git a/tests/baselines/reference/interfaceImplementation7.errors.txt b/tests/baselines/reference/interfaceImplementation7.errors.txt
index ff1118e5c690b..b297015dfbeea 100644
--- a/tests/baselines/reference/interfaceImplementation7.errors.txt
+++ b/tests/baselines/reference/interfaceImplementation7.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/compiler/interfaceImplementation7.ts(4,11): error TS2320: Interface 'i3' cannot simultaneously extend types 'i1' and 'i2'.
-  Named properties 'name' of types 'i1' and 'i2' are not identical.
+  Named property 'name' of types 'i1' and 'i2' are not identical.
 tests/cases/compiler/interfaceImplementation7.ts(7,7): error TS2420: Class 'C1' incorrectly implements interface 'i4'.
   Types of property 'name' are incompatible.
     Type '() => string' is not assignable to type '() => { s: string; n: number; }'.
@@ -14,7 +14,7 @@ tests/cases/compiler/interfaceImplementation7.ts(7,7): error TS2420: Class 'C1'
     interface i3 extends i1, i2 { }
               ~~
 !!! error TS2320: Interface 'i3' cannot simultaneously extend types 'i1' and 'i2'.
-!!! error TS2320:   Named properties 'name' of types 'i1' and 'i2' are not identical.
+!!! error TS2320:   Named property 'name' of types 'i1' and 'i2' are not identical.
     interface i4 extends i1, i2 { name(): { s: string; n: number; }; }
     
     class C1 implements i4 {
diff --git a/tests/baselines/reference/interfacePropertiesWithSameName2.errors.txt b/tests/baselines/reference/interfacePropertiesWithSameName2.errors.txt
index a7df9c15e5980..82301d9ae16ba 100644
--- a/tests/baselines/reference/interfacePropertiesWithSameName2.errors.txt
+++ b/tests/baselines/reference/interfacePropertiesWithSameName2.errors.txt
@@ -1,7 +1,7 @@
 tests/cases/compiler/interfacePropertiesWithSameName2.ts(10,11): error TS2320: Interface 'MoverShaker' cannot simultaneously extend types 'Mover' and 'Shaker'.
-  Named properties 'getStatus' of types 'Mover' and 'Shaker' are not identical.
+  Named property 'getStatus' of types 'Mover' and 'Shaker' are not identical.
 tests/cases/compiler/interfacePropertiesWithSameName2.ts(26,11): error TS2320: Interface 'MoverShaker2' cannot simultaneously extend types 'Mover' and 'Shaker'.
-  Named properties 'getStatus' of types 'Mover' and 'Shaker' are not identical.
+  Named property 'getStatus' of types 'Mover' and 'Shaker' are not identical.
 
 
 ==== tests/cases/compiler/interfacePropertiesWithSameName2.ts (2 errors) ====
@@ -17,7 +17,7 @@ tests/cases/compiler/interfacePropertiesWithSameName2.ts(26,11): error TS2320: I
     interface MoverShaker extends Mover, Shaker {
               ~~~~~~~~~~~
 !!! error TS2320: Interface 'MoverShaker' cannot simultaneously extend types 'Mover' and 'Shaker'.
-!!! error TS2320:   Named properties 'getStatus' of types 'Mover' and 'Shaker' are not identical.
+!!! error TS2320:   Named property 'getStatus' of types 'Mover' and 'Shaker' are not identical.
     
     }
     
@@ -36,7 +36,7 @@ tests/cases/compiler/interfacePropertiesWithSameName2.ts(26,11): error TS2320: I
     interface MoverShaker2 extends MoversAndShakers.Mover, MoversAndShakers.Shaker { } // error
               ~~~~~~~~~~~~
 !!! error TS2320: Interface 'MoverShaker2' cannot simultaneously extend types 'Mover' and 'Shaker'.
-!!! error TS2320:   Named properties 'getStatus' of types 'Mover' and 'Shaker' are not identical.
+!!! error TS2320:   Named property 'getStatus' of types 'Mover' and 'Shaker' are not identical.
     
     interface MoverShaker3 extends MoversAndShakers.Mover, MoversAndShakers.Shaker {
         getStatus(): { speed: number; frequency: number; }; // ok because this getStatus overrides the conflicting ones above
diff --git a/tests/baselines/reference/interfacePropertiesWithSameName3.errors.txt b/tests/baselines/reference/interfacePropertiesWithSameName3.errors.txt
index b7dfdffc79e9e..cc333e0e0545d 100644
--- a/tests/baselines/reference/interfacePropertiesWithSameName3.errors.txt
+++ b/tests/baselines/reference/interfacePropertiesWithSameName3.errors.txt
@@ -1,7 +1,7 @@
 tests/cases/compiler/interfacePropertiesWithSameName3.ts(3,11): error TS2320: Interface 'F' cannot simultaneously extend types 'E' and 'D'.
-  Named properties 'a' of types 'E' and 'D' are not identical.
+  Named property 'a' of types 'E' and 'D' are not identical.
 tests/cases/compiler/interfacePropertiesWithSameName3.ts(7,11): error TS2320: Interface 'F2' cannot simultaneously extend types 'E2' and 'D2'.
-  Named properties 'a' of types 'E2' and 'D2' are not identical.
+  Named property 'a' of types 'E2' and 'D2' are not identical.
 
 
 ==== tests/cases/compiler/interfacePropertiesWithSameName3.ts (2 errors) ====
@@ -10,12 +10,12 @@ tests/cases/compiler/interfacePropertiesWithSameName3.ts(7,11): error TS2320: In
     interface F extends E, D { } // error
               ~
 !!! error TS2320: Interface 'F' cannot simultaneously extend types 'E' and 'D'.
-!!! error TS2320:   Named properties 'a' of types 'E' and 'D' are not identical.
+!!! error TS2320:   Named property 'a' of types 'E' and 'D' are not identical.
     
     class D2 { a: number; }
     class E2 { a: string; }
     interface F2 extends E2, D2 { } // error
               ~~
 !!! error TS2320: Interface 'F2' cannot simultaneously extend types 'E2' and 'D2'.
-!!! error TS2320:   Named properties 'a' of types 'E2' and 'D2' are not identical.
+!!! error TS2320:   Named property 'a' of types 'E2' and 'D2' are not identical.
     
\ No newline at end of file
diff --git a/tests/baselines/reference/interfaceWithMultipleBaseTypes.errors.txt b/tests/baselines/reference/interfaceWithMultipleBaseTypes.errors.txt
index 1562e16df4df4..95adbbf671746 100644
--- a/tests/baselines/reference/interfaceWithMultipleBaseTypes.errors.txt
+++ b/tests/baselines/reference/interfaceWithMultipleBaseTypes.errors.txt
@@ -4,7 +4,7 @@ tests/cases/conformance/interfaces/interfaceDeclarations/interfaceWithMultipleBa
       Types of property 'b' are incompatible.
         Type 'number' is not assignable to type 'string'.
 tests/cases/conformance/interfaces/interfaceDeclarations/interfaceWithMultipleBaseTypes.ts(52,15): error TS2320: Interface 'Derived3<T>' cannot simultaneously extend types 'Base1<number>' and 'Base2<number>'.
-  Named properties 'x' of types 'Base1<number>' and 'Base2<number>' are not identical.
+  Named property 'x' of types 'Base1<number>' and 'Base2<number>' are not identical.
 tests/cases/conformance/interfaces/interfaceDeclarations/interfaceWithMultipleBaseTypes.ts(54,15): error TS2430: Interface 'Derived4<T>' incorrectly extends interface 'Base1<number>'.
   Types of property 'x' are incompatible.
     Type '{ a: T; b: T; }' is not assignable to type '{ a: number; }'.
@@ -86,7 +86,7 @@ tests/cases/conformance/interfaces/interfaceDeclarations/interfaceWithMultipleBa
         interface Derived3<T> extends Base1<number>, Base2<number> { } // error
                   ~~~~~~~~
 !!! error TS2320: Interface 'Derived3<T>' cannot simultaneously extend types 'Base1<number>' and 'Base2<number>'.
-!!! error TS2320:   Named properties 'x' of types 'Base1<number>' and 'Base2<number>' are not identical.
+!!! error TS2320:   Named property 'x' of types 'Base1<number>' and 'Base2<number>' are not identical.
     
         interface Derived4<T> extends Base1<number>, Base2<number> { // error
                   ~~~~~~~~
diff --git a/tests/baselines/reference/letInLetOrConstDeclarations.errors.txt b/tests/baselines/reference/letInLetOrConstDeclarations.errors.txt
index 799d2d6b6982d..fbcee2765832f 100644
--- a/tests/baselines/reference/letInLetOrConstDeclarations.errors.txt
+++ b/tests/baselines/reference/letInLetOrConstDeclarations.errors.txt
@@ -1,21 +1,21 @@
-tests/cases/compiler/letInLetOrConstDeclarations.ts(2,9): error TS2476: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
-tests/cases/compiler/letInLetOrConstDeclarations.ts(3,14): error TS2476: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
-tests/cases/compiler/letInLetOrConstDeclarations.ts(6,11): error TS2476: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
+tests/cases/compiler/letInLetOrConstDeclarations.ts(2,9): error TS2480: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
+tests/cases/compiler/letInLetOrConstDeclarations.ts(3,14): error TS2480: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
+tests/cases/compiler/letInLetOrConstDeclarations.ts(6,11): error TS2480: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
 
 
 ==== tests/cases/compiler/letInLetOrConstDeclarations.ts (3 errors) ====
     {
         let let = 1; // should error
             ~~~
-!!! error TS2476: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
+!!! error TS2480: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
         for (let let in []) { } // should error
                  ~~~
-!!! error TS2476: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
+!!! error TS2480: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
     }
     {
         const let = 1; // should error
               ~~~
-!!! error TS2476: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
+!!! error TS2480: 'let' is not allowed to be used as a name in 'let' or 'const' declarations.
     }
     {
         function let() { // should be ok
diff --git a/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.errors.txt b/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.errors.txt
index 4c49e6beb0c57..584edc24bb59a 100644
--- a/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.errors.txt
+++ b/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.errors.txt
@@ -1,7 +1,7 @@
 tests/cases/conformance/interfaces/declarationMerging/mergedInterfacesWithInheritedPrivates3.ts(9,11): error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
-  Named properties 'x' of types 'C' and 'C2' are not identical.
+  Named property 'x' of types 'C' and 'C2' are not identical.
 tests/cases/conformance/interfaces/declarationMerging/mergedInterfacesWithInheritedPrivates3.ts(31,15): error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
-  Named properties 'x' of types 'C' and 'C2' are not identical.
+  Named property 'x' of types 'C' and 'C2' are not identical.
 
 
 ==== tests/cases/conformance/interfaces/declarationMerging/mergedInterfacesWithInheritedPrivates3.ts (2 errors) ====
@@ -16,7 +16,7 @@ tests/cases/conformance/interfaces/declarationMerging/mergedInterfacesWithInheri
     interface A extends C { // error
               ~
 !!! error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
-!!! error TS2320:   Named properties 'x' of types 'C' and 'C2' are not identical.
+!!! error TS2320:   Named property 'x' of types 'C' and 'C2' are not identical.
         y: string;
     }
     
@@ -41,7 +41,7 @@ tests/cases/conformance/interfaces/declarationMerging/mergedInterfacesWithInheri
         interface A extends C { // error, privates conflict
                   ~
 !!! error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
-!!! error TS2320:   Named properties 'x' of types 'C' and 'C2' are not identical.
+!!! error TS2320:   Named property 'x' of types 'C' and 'C2' are not identical.
             y: string;
         }
     
diff --git a/tests/baselines/reference/mergedInterfacesWithMultipleBases4.errors.txt b/tests/baselines/reference/mergedInterfacesWithMultipleBases4.errors.txt
index 1e11dc792f122..f7ea6fbc2a014 100644
--- a/tests/baselines/reference/mergedInterfacesWithMultipleBases4.errors.txt
+++ b/tests/baselines/reference/mergedInterfacesWithMultipleBases4.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/conformance/interfaces/declarationMerging/mergedInterfacesWithMultipleBases4.ts(19,11): error TS2320: Interface 'A<T>' cannot simultaneously extend types 'C<string>' and 'C<number>'.
-  Named properties 'a' of types 'C<string>' and 'C<number>' are not identical.
+  Named property 'a' of types 'C<string>' and 'C<number>' are not identical.
 
 
 ==== tests/cases/conformance/interfaces/declarationMerging/mergedInterfacesWithMultipleBases4.ts (1 errors) ====
@@ -24,7 +24,7 @@ tests/cases/conformance/interfaces/declarationMerging/mergedInterfacesWithMultip
     interface A<T> extends C<string>, C3<string> { // error
               ~
 !!! error TS2320: Interface 'A<T>' cannot simultaneously extend types 'C<string>' and 'C<number>'.
-!!! error TS2320:   Named properties 'a' of types 'C<string>' and 'C<number>' are not identical.
+!!! error TS2320:   Named property 'a' of types 'C<string>' and 'C<number>' are not identical.
         y: T;
     }
     
diff --git a/tests/baselines/reference/multipleBaseInterfaesWithIncompatibleProperties.errors.txt b/tests/baselines/reference/multipleBaseInterfaesWithIncompatibleProperties.errors.txt
index 633f544a67bb2..70db70de97b8c 100644
--- a/tests/baselines/reference/multipleBaseInterfaesWithIncompatibleProperties.errors.txt
+++ b/tests/baselines/reference/multipleBaseInterfaesWithIncompatibleProperties.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/compiler/multipleBaseInterfaesWithIncompatibleProperties.ts(6,11): error TS2320: Interface 'C' cannot simultaneously extend types 'A<string>' and 'A<number>'.
-  Named properties 'x' of types 'A<string>' and 'A<number>' are not identical.
+  Named property 'x' of types 'A<string>' and 'A<number>' are not identical.
 
 
 ==== tests/cases/compiler/multipleBaseInterfaesWithIncompatibleProperties.ts (1 errors) ====
@@ -11,5 +11,5 @@ tests/cases/compiler/multipleBaseInterfaesWithIncompatibleProperties.ts(6,11): e
     interface C extends A<string>, A<number> { }
               ~
 !!! error TS2320: Interface 'C' cannot simultaneously extend types 'A<string>' and 'A<number>'.
-!!! error TS2320:   Named properties 'x' of types 'A<string>' and 'A<number>' are not identical.
+!!! error TS2320:   Named property 'x' of types 'A<string>' and 'A<number>' are not identical.
     
\ No newline at end of file
diff --git a/tests/baselines/reference/objectCreationOfElementAccessExpression.errors.txt b/tests/baselines/reference/objectCreationOfElementAccessExpression.errors.txt
index 73332ff8926ee..b2f3bd9d82479 100644
--- a/tests/baselines/reference/objectCreationOfElementAccessExpression.errors.txt
+++ b/tests/baselines/reference/objectCreationOfElementAccessExpression.errors.txt
@@ -1,6 +1,6 @@
-tests/cases/compiler/objectCreationOfElementAccessExpression.ts(53,17): error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
+tests/cases/compiler/objectCreationOfElementAccessExpression.ts(53,17): error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
 tests/cases/compiler/objectCreationOfElementAccessExpression.ts(53,63): error TS2348: Value of type 'typeof Cookie' is not callable. Did you mean to include 'new'?
-tests/cases/compiler/objectCreationOfElementAccessExpression.ts(54,33): error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
+tests/cases/compiler/objectCreationOfElementAccessExpression.ts(54,33): error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
 tests/cases/compiler/objectCreationOfElementAccessExpression.ts(54,79): error TS2348: Value of type 'typeof Cookie' is not callable. Did you mean to include 'new'?
 
 
@@ -59,12 +59,12 @@ tests/cases/compiler/objectCreationOfElementAccessExpression.ts(54,79): error TS
     // ElementAccessExpressions can only contain one expression.  There should be a parse error here.
     var foods = new PetFood[new IceCream('Mint chocolate chip') , Cookie('Chocolate chip', false) , new Cookie('Peanut butter', true)];
                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
+!!! error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
                                                                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 !!! error TS2348: Value of type 'typeof Cookie' is not callable. Did you mean to include 'new'?
     var foods2: MonsterFood[] = new PetFood[new IceCream('Mint chocolate chip') , Cookie('Chocolate chip', false) , new Cookie('Peanut butter', true)];
                                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
+!!! error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
                                                                                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 !!! error TS2348: Value of type 'typeof Cookie' is not callable. Did you mean to include 'new'?
     
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName10.errors.txt b/tests/baselines/reference/parserComputedPropertyName10.errors.txt
index 061e2c40c2db8..a9b5396781aa5 100644
--- a/tests/baselines/reference/parserComputedPropertyName10.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName10.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName10.ts(2,4): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName10.ts(2,4): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName10.ts(2,5): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     class C {
        [e] = 1
        ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName11.errors.txt b/tests/baselines/reference/parserComputedPropertyName11.errors.txt
index 65748f72b2425..2a7a606f4bfcb 100644
--- a/tests/baselines/reference/parserComputedPropertyName11.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName11.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName11.ts(2,4): error TS1168: Computed property names are not allowed in method overloads.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName11.ts(2,4): error TS1168: A computed property name in a method overload must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName11.ts(2,5): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     class C {
        [e]();
        ~~~
-!!! error TS1168: Computed property names are not allowed in method overloads.
+!!! error TS1168: A computed property name in a method overload must directly refer to a built-in symbol.
         ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName13.errors.txt b/tests/baselines/reference/parserComputedPropertyName13.errors.txt
index b209f3c7d0184..a7a77cf12440f 100644
--- a/tests/baselines/reference/parserComputedPropertyName13.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName13.errors.txt
@@ -1,10 +1,10 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName13.ts(1,10): error TS1170: Computed property names are not allowed in type literals.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName13.ts(1,10): error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName13.ts(1,11): error TS2304: Cannot find name 'e'.
 
 
 ==== tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName13.ts (2 errors) ====
     var v: { [e]: number };
              ~~~
-!!! error TS1170: Computed property names are not allowed in type literals.
+!!! error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
               ~
 !!! error TS2304: Cannot find name 'e'.
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName14.errors.txt b/tests/baselines/reference/parserComputedPropertyName14.errors.txt
index 6ac2d276a8010..50a6d1bc689ac 100644
--- a/tests/baselines/reference/parserComputedPropertyName14.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName14.errors.txt
@@ -1,10 +1,10 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName14.ts(1,10): error TS1170: Computed property names are not allowed in type literals.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName14.ts(1,10): error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName14.ts(1,11): error TS2304: Cannot find name 'e'.
 
 
 ==== tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName14.ts (2 errors) ====
     var v: { [e](): number };
              ~~~
-!!! error TS1170: Computed property names are not allowed in type literals.
+!!! error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
               ~
 !!! error TS2304: Cannot find name 'e'.
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName15.errors.txt b/tests/baselines/reference/parserComputedPropertyName15.errors.txt
index f66e5930c26f4..9635178af1673 100644
--- a/tests/baselines/reference/parserComputedPropertyName15.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName15.errors.txt
@@ -1,10 +1,10 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName15.ts(1,31): error TS1170: Computed property names are not allowed in type literals.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName15.ts(1,31): error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName15.ts(1,32): error TS2304: Cannot find name 'e'.
 
 
 ==== tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName15.ts (2 errors) ====
     var v: { [e: number]: string; [e]: number };
                                   ~~~
-!!! error TS1170: Computed property names are not allowed in type literals.
+!!! error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
                                    ~
 !!! error TS2304: Cannot find name 'e'.
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName18.errors.txt b/tests/baselines/reference/parserComputedPropertyName18.errors.txt
index f7485a127cbd1..9e64ddd0d28db 100644
--- a/tests/baselines/reference/parserComputedPropertyName18.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName18.errors.txt
@@ -1,10 +1,10 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName18.ts(1,10): error TS1170: Computed property names are not allowed in type literals.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName18.ts(1,10): error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName18.ts(1,11): error TS2304: Cannot find name 'e'.
 
 
 ==== tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName18.ts (2 errors) ====
     var v: { [e]?(): number };
              ~~~
-!!! error TS1170: Computed property names are not allowed in type literals.
+!!! error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
               ~
 !!! error TS2304: Cannot find name 'e'.
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName19.errors.txt b/tests/baselines/reference/parserComputedPropertyName19.errors.txt
index 65c22ff36c39a..86bb591011e36 100644
--- a/tests/baselines/reference/parserComputedPropertyName19.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName19.errors.txt
@@ -1,10 +1,10 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName19.ts(1,10): error TS1170: Computed property names are not allowed in type literals.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName19.ts(1,10): error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName19.ts(1,11): error TS2304: Cannot find name 'e'.
 
 
 ==== tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName19.ts (2 errors) ====
     var v: { [e]? };
              ~~~
-!!! error TS1170: Computed property names are not allowed in type literals.
+!!! error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
               ~
 !!! error TS2304: Cannot find name 'e'.
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName20.errors.txt b/tests/baselines/reference/parserComputedPropertyName20.errors.txt
index d65dfede1d241..035e494af332c 100644
--- a/tests/baselines/reference/parserComputedPropertyName20.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName20.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName20.ts(2,5): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName20.ts(2,5): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName20.ts(2,6): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     interface I {
         [e](): number 
         ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName21.errors.txt b/tests/baselines/reference/parserComputedPropertyName21.errors.txt
index 5a9738a23a697..4ebc321cc8032 100644
--- a/tests/baselines/reference/parserComputedPropertyName21.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName21.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName21.ts(2,5): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName21.ts(2,5): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName21.ts(2,6): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     interface I {
         [e]: number 
         ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName22.errors.txt b/tests/baselines/reference/parserComputedPropertyName22.errors.txt
index ce20dd0c58759..fd9e37970187c 100644
--- a/tests/baselines/reference/parserComputedPropertyName22.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName22.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName22.ts(2,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName22.ts(2,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName22.ts(2,6): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     declare class C {
         [e]: number 
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName25.errors.txt b/tests/baselines/reference/parserComputedPropertyName25.errors.txt
index 8d26c8afdb7f1..0d0a2a8d8332b 100644
--- a/tests/baselines/reference/parserComputedPropertyName25.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName25.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName25.ts(3,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName25.ts(3,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName25.ts(3,6): error TS2304: Cannot find name 'e'.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName25.ts(4,6): error TS2304: Cannot find name 'e2'.
 
@@ -8,7 +8,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
         // No ASI
         [e] = 0
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'e'.
         [e2] = 1
diff --git a/tests/baselines/reference/parserComputedPropertyName28.errors.txt b/tests/baselines/reference/parserComputedPropertyName28.errors.txt
index c522ec031ebdc..a84f3b7d16b96 100644
--- a/tests/baselines/reference/parserComputedPropertyName28.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName28.errors.txt
@@ -1,6 +1,6 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName28.ts(2,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName28.ts(2,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName28.ts(2,6): error TS2304: Cannot find name 'e'.
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName28.ts(3,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName28.ts(3,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName28.ts(3,6): error TS2304: Cannot find name 'e2'.
 
 
@@ -8,12 +8,12 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     class C {
         [e]: number = 0;
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'e'.
         [e2]: number
         ~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~~
 !!! error TS2304: Cannot find name 'e2'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName29.errors.txt b/tests/baselines/reference/parserComputedPropertyName29.errors.txt
index 5e6baed0f0674..3d886eacc5063 100644
--- a/tests/baselines/reference/parserComputedPropertyName29.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName29.errors.txt
@@ -1,7 +1,7 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName29.ts(3,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName29.ts(3,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName29.ts(3,6): error TS2304: Cannot find name 'e'.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName29.ts(3,11): error TS2304: Cannot find name 'id'.
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName29.ts(4,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName29.ts(4,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName29.ts(4,6): error TS2304: Cannot find name 'e2'.
 
 
@@ -10,14 +10,14 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
         // yes ASI
         [e] = id++
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'e'.
               ~~
 !!! error TS2304: Cannot find name 'id'.
         [e2]: number
         ~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~~
 !!! error TS2304: Cannot find name 'e2'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName31.errors.txt b/tests/baselines/reference/parserComputedPropertyName31.errors.txt
index 97a3b1ee18758..4661b0797af98 100644
--- a/tests/baselines/reference/parserComputedPropertyName31.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName31.errors.txt
@@ -1,6 +1,6 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName31.ts(3,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName31.ts(3,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName31.ts(3,6): error TS2304: Cannot find name 'e'.
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName31.ts(4,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName31.ts(4,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName31.ts(4,6): error TS2304: Cannot find name 'e2'.
 
 
@@ -9,12 +9,12 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
         // yes ASI
         [e]: number
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'e'.
         [e2]: number
         ~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~~
 !!! error TS2304: Cannot find name 'e2'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName32.errors.txt b/tests/baselines/reference/parserComputedPropertyName32.errors.txt
index da423baaa0523..4be8d70383e19 100644
--- a/tests/baselines/reference/parserComputedPropertyName32.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName32.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName32.ts(2,5): error TS1165: Computed property names are not allowed in an ambient context.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName32.ts(2,5): error TS1165: A computed property name in an ambient context must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName32.ts(2,6): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     declare class C {
         [e](): number 
         ~~~
-!!! error TS1165: Computed property names are not allowed in an ambient context.
+!!! error TS1165: A computed property name in an ambient context must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName36.errors.txt b/tests/baselines/reference/parserComputedPropertyName36.errors.txt
index 1b4130b0e2734..07e937b3b42a6 100644
--- a/tests/baselines/reference/parserComputedPropertyName36.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName36.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName36.ts(2,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName36.ts(2,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName36.ts(2,6): error TS2304: Cannot find name 'public'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     class C {
         [public ]: string;
         ~~~~~~~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~~~~~~
 !!! error TS2304: Cannot find name 'public'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName41.errors.txt b/tests/baselines/reference/parserComputedPropertyName41.errors.txt
index 65d4ec8627f6a..5389b187cad38 100644
--- a/tests/baselines/reference/parserComputedPropertyName41.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName41.errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName41.ts(2,5): error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName41.ts(2,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
 
 
 ==== tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName41.ts (1 errors) ====
     var v = {
         [0 in []]: true
         ~~~~~~~~~
-!!! error TS2464: A computed property name must be of type 'string', 'number', or 'any'.
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName7.errors.txt b/tests/baselines/reference/parserComputedPropertyName7.errors.txt
index bcf39b0ca0ac7..056fa3d82fdd4 100644
--- a/tests/baselines/reference/parserComputedPropertyName7.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName7.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName7.ts(2,4): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName7.ts(2,4): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName7.ts(2,5): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     class C {
        [e]
        ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName8.errors.txt b/tests/baselines/reference/parserComputedPropertyName8.errors.txt
index 250c7a52c6e38..32bb490635357 100644
--- a/tests/baselines/reference/parserComputedPropertyName8.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName8.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName8.ts(2,11): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName8.ts(2,11): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName8.ts(2,12): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     class C {
        public [e]
               ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
                ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserComputedPropertyName9.errors.txt b/tests/baselines/reference/parserComputedPropertyName9.errors.txt
index fd43404656462..9db0cbde3bd29 100644
--- a/tests/baselines/reference/parserComputedPropertyName9.errors.txt
+++ b/tests/baselines/reference/parserComputedPropertyName9.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName9.ts(2,4): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName9.ts(2,4): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName9.ts(2,5): error TS2304: Cannot find name 'e'.
 tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedPropertyName9.ts(2,9): error TS2304: Cannot find name 'Type'.
 
@@ -7,7 +7,7 @@ tests/cases/conformance/parser/ecmascript6/ComputedPropertyNames/parserComputedP
     class C {
        [e]: Type
        ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         ~
 !!! error TS2304: Cannot find name 'e'.
             ~~~~
diff --git a/tests/baselines/reference/parserES5ComputedPropertyName1.errors.txt b/tests/baselines/reference/parserES5ComputedPropertyName1.errors.txt
index 55af923e54b8d..2c8f1d2ab4f0e 100644
--- a/tests/baselines/reference/parserES5ComputedPropertyName1.errors.txt
+++ b/tests/baselines/reference/parserES5ComputedPropertyName1.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName1.ts(2,5): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName1.ts(2,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName1.ts(2,6): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5Comput
     declare class C {
         [e]: number 
         ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5ComputedPropertyName10.errors.txt b/tests/baselines/reference/parserES5ComputedPropertyName10.errors.txt
index 7db85cdef3519..31d3f9985abae 100644
--- a/tests/baselines/reference/parserES5ComputedPropertyName10.errors.txt
+++ b/tests/baselines/reference/parserES5ComputedPropertyName10.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName10.ts(2,4): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName10.ts(2,4): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName10.ts(2,5): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5Comput
     class C {
        [e] = 1
        ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5ComputedPropertyName11.errors.txt b/tests/baselines/reference/parserES5ComputedPropertyName11.errors.txt
index ead27a994d105..b4808607ab06d 100644
--- a/tests/baselines/reference/parserES5ComputedPropertyName11.errors.txt
+++ b/tests/baselines/reference/parserES5ComputedPropertyName11.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName11.ts(2,4): error TS1168: Computed property names are not allowed in method overloads.
+tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName11.ts(2,4): error TS1168: A computed property name in a method overload must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName11.ts(2,5): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5Comput
     class C {
        [e]();
        ~~~
-!!! error TS1168: Computed property names are not allowed in method overloads.
+!!! error TS1168: A computed property name in a method overload must directly refer to a built-in symbol.
         ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5ComputedPropertyName5.errors.txt b/tests/baselines/reference/parserES5ComputedPropertyName5.errors.txt
index 122ca20a0e439..9125ce7b58f42 100644
--- a/tests/baselines/reference/parserES5ComputedPropertyName5.errors.txt
+++ b/tests/baselines/reference/parserES5ComputedPropertyName5.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName5.ts(2,5): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName5.ts(2,5): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName5.ts(2,6): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5Comput
     interface I {
         [e]: number 
         ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
          ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5ComputedPropertyName7.errors.txt b/tests/baselines/reference/parserES5ComputedPropertyName7.errors.txt
index d38d57d87be75..277bdcd3c94a5 100644
--- a/tests/baselines/reference/parserES5ComputedPropertyName7.errors.txt
+++ b/tests/baselines/reference/parserES5ComputedPropertyName7.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName7.ts(2,4): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName7.ts(2,4): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName7.ts(2,5): error TS2304: Cannot find name 'e'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5Comput
     class C {
        [e]
        ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         ~
 !!! error TS2304: Cannot find name 'e'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5ComputedPropertyName8.errors.txt b/tests/baselines/reference/parserES5ComputedPropertyName8.errors.txt
index e52727c6929bc..6b674a1d2c05b 100644
--- a/tests/baselines/reference/parserES5ComputedPropertyName8.errors.txt
+++ b/tests/baselines/reference/parserES5ComputedPropertyName8.errors.txt
@@ -1,10 +1,10 @@
-tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName8.ts(1,10): error TS1170: Computed property names are not allowed in type literals.
+tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName8.ts(1,10): error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName8.ts(1,11): error TS2304: Cannot find name 'e'.
 
 
 ==== tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName8.ts (2 errors) ====
     var v: { [e]: number };
              ~~~
-!!! error TS1170: Computed property names are not allowed in type literals.
+!!! error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
               ~
 !!! error TS2304: Cannot find name 'e'.
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5ComputedPropertyName9.errors.txt b/tests/baselines/reference/parserES5ComputedPropertyName9.errors.txt
index 8cbe0ffcf8dc3..fb087a4d82fcc 100644
--- a/tests/baselines/reference/parserES5ComputedPropertyName9.errors.txt
+++ b/tests/baselines/reference/parserES5ComputedPropertyName9.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName9.ts(2,4): error TS1166: Computed property names are not allowed in class property declarations.
+tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName9.ts(2,4): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName9.ts(2,5): error TS2304: Cannot find name 'e'.
 tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5ComputedPropertyName9.ts(2,9): error TS2304: Cannot find name 'Type'.
 
@@ -7,7 +7,7 @@ tests/cases/conformance/parser/ecmascript5/ComputedPropertyNames/parserES5Comput
     class C {
        [e]: Type
        ~~~
-!!! error TS1166: Computed property names are not allowed in class property declarations.
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
         ~
 !!! error TS2304: Cannot find name 'e'.
             ~~~~
diff --git a/tests/baselines/reference/parserES5SymbolIndexer1.errors.txt b/tests/baselines/reference/parserES5SymbolIndexer1.errors.txt
new file mode 100644
index 0000000000000..adfac8f700f2f
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolIndexer1.errors.txt
@@ -0,0 +1,9 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer1.ts(2,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer1.ts (1 errors) ====
+    interface I {
+        [s: symbol]: string;
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolIndexer1.js b/tests/baselines/reference/parserES5SymbolIndexer1.js
new file mode 100644
index 0000000000000..641d93b1170bd
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolIndexer1.js
@@ -0,0 +1,6 @@
+//// [parserES5SymbolIndexer1.ts]
+interface I {
+    [s: symbol]: string;
+}
+
+//// [parserES5SymbolIndexer1.js]
diff --git a/tests/baselines/reference/parserES5SymbolIndexer2.errors.txt b/tests/baselines/reference/parserES5SymbolIndexer2.errors.txt
new file mode 100644
index 0000000000000..12eef8ec04967
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolIndexer2.errors.txt
@@ -0,0 +1,9 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer2.ts(2,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer2.ts (1 errors) ====
+    class C {
+        [s: symbol]: string;
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolIndexer2.js b/tests/baselines/reference/parserES5SymbolIndexer2.js
new file mode 100644
index 0000000000000..c511b6acafae2
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolIndexer2.js
@@ -0,0 +1,11 @@
+//// [parserES5SymbolIndexer2.ts]
+class C {
+    [s: symbol]: string;
+}
+
+//// [parserES5SymbolIndexer2.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
diff --git a/tests/baselines/reference/parserES5SymbolIndexer3.errors.txt b/tests/baselines/reference/parserES5SymbolIndexer3.errors.txt
new file mode 100644
index 0000000000000..c9cd9db4fab8b
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolIndexer3.errors.txt
@@ -0,0 +1,9 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer3.ts(2,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer3.ts (1 errors) ====
+    var x: {
+        [s: symbol]: string;
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolIndexer3.js b/tests/baselines/reference/parserES5SymbolIndexer3.js
new file mode 100644
index 0000000000000..daffb51a6d76a
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolIndexer3.js
@@ -0,0 +1,7 @@
+//// [parserES5SymbolIndexer3.ts]
+var x: {
+    [s: symbol]: string;
+}
+
+//// [parserES5SymbolIndexer3.js]
+var x;
diff --git a/tests/baselines/reference/parserES5SymbolProperty1.errors.txt b/tests/baselines/reference/parserES5SymbolProperty1.errors.txt
new file mode 100644
index 0000000000000..e82ac4c3bc6c2
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty1.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty1.ts(2,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty1.ts(2,6): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty1.ts (2 errors) ====
+    interface I {
+        [Symbol.iterator]: string;
+        ~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolProperty1.js b/tests/baselines/reference/parserES5SymbolProperty1.js
new file mode 100644
index 0000000000000..36030aec105bc
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty1.js
@@ -0,0 +1,6 @@
+//// [parserES5SymbolProperty1.ts]
+interface I {
+    [Symbol.iterator]: string;
+}
+
+//// [parserES5SymbolProperty1.js]
diff --git a/tests/baselines/reference/parserES5SymbolProperty2.errors.txt b/tests/baselines/reference/parserES5SymbolProperty2.errors.txt
new file mode 100644
index 0000000000000..c8ca6613da8bb
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty2.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty2.ts(2,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty2.ts(2,6): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty2.ts (2 errors) ====
+    interface I {
+        [Symbol.unscopables](): string;
+        ~~~~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolProperty2.js b/tests/baselines/reference/parserES5SymbolProperty2.js
new file mode 100644
index 0000000000000..d600b05ea52dd
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty2.js
@@ -0,0 +1,6 @@
+//// [parserES5SymbolProperty2.ts]
+interface I {
+    [Symbol.unscopables](): string;
+}
+
+//// [parserES5SymbolProperty2.js]
diff --git a/tests/baselines/reference/parserES5SymbolProperty3.errors.txt b/tests/baselines/reference/parserES5SymbolProperty3.errors.txt
new file mode 100644
index 0000000000000..4bd883b44b73b
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty3.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty3.ts(2,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty3.ts(2,6): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty3.ts (2 errors) ====
+    declare class C {
+        [Symbol.unscopables](): string;
+        ~~~~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolProperty3.js b/tests/baselines/reference/parserES5SymbolProperty3.js
new file mode 100644
index 0000000000000..0d0fb18313fb7
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty3.js
@@ -0,0 +1,6 @@
+//// [parserES5SymbolProperty3.ts]
+declare class C {
+    [Symbol.unscopables](): string;
+}
+
+//// [parserES5SymbolProperty3.js]
diff --git a/tests/baselines/reference/parserES5SymbolProperty4.errors.txt b/tests/baselines/reference/parserES5SymbolProperty4.errors.txt
new file mode 100644
index 0000000000000..cdc5510766e0d
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty4.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty4.ts(2,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty4.ts(2,6): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty4.ts (2 errors) ====
+    declare class C {
+        [Symbol.isRegExp]: string;
+        ~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolProperty4.js b/tests/baselines/reference/parserES5SymbolProperty4.js
new file mode 100644
index 0000000000000..d8f55358e73ce
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty4.js
@@ -0,0 +1,6 @@
+//// [parserES5SymbolProperty4.ts]
+declare class C {
+    [Symbol.isRegExp]: string;
+}
+
+//// [parserES5SymbolProperty4.js]
diff --git a/tests/baselines/reference/parserES5SymbolProperty5.errors.txt b/tests/baselines/reference/parserES5SymbolProperty5.errors.txt
new file mode 100644
index 0000000000000..2e80a55b47e06
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty5.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty5.ts(2,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty5.ts(2,6): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty5.ts (2 errors) ====
+    class C {
+        [Symbol.isRegExp]: string;
+        ~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolProperty5.js b/tests/baselines/reference/parserES5SymbolProperty5.js
new file mode 100644
index 0000000000000..e2448432542c5
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty5.js
@@ -0,0 +1,11 @@
+//// [parserES5SymbolProperty5.ts]
+class C {
+    [Symbol.isRegExp]: string;
+}
+
+//// [parserES5SymbolProperty5.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
diff --git a/tests/baselines/reference/parserES5SymbolProperty6.errors.txt b/tests/baselines/reference/parserES5SymbolProperty6.errors.txt
new file mode 100644
index 0000000000000..615be8ca8da51
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty6.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty6.ts(2,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty6.ts(2,6): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty6.ts (2 errors) ====
+    class C {
+        [Symbol.toStringTag]: string = "";
+        ~~~~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolProperty6.js b/tests/baselines/reference/parserES5SymbolProperty6.js
new file mode 100644
index 0000000000000..ce2050688c3a1
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty6.js
@@ -0,0 +1,12 @@
+//// [parserES5SymbolProperty6.ts]
+class C {
+    [Symbol.toStringTag]: string = "";
+}
+
+//// [parserES5SymbolProperty6.js]
+var C = (function () {
+    function C() {
+        this[Symbol.toStringTag] = "";
+    }
+    return C;
+})();
diff --git a/tests/baselines/reference/parserES5SymbolProperty7.errors.txt b/tests/baselines/reference/parserES5SymbolProperty7.errors.txt
new file mode 100644
index 0000000000000..fa43310f0a7ea
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty7.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty7.ts(2,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty7.ts(2,6): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty7.ts (2 errors) ====
+    class C {
+        [Symbol.toStringTag](): void { }
+        ~~~~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolProperty7.js b/tests/baselines/reference/parserES5SymbolProperty7.js
new file mode 100644
index 0000000000000..102d10af417d5
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty7.js
@@ -0,0 +1,12 @@
+//// [parserES5SymbolProperty7.ts]
+class C {
+    [Symbol.toStringTag](): void { }
+}
+
+//// [parserES5SymbolProperty7.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.toStringTag] = function () { };
+    return C;
+})();
diff --git a/tests/baselines/reference/parserES5SymbolProperty8.errors.txt b/tests/baselines/reference/parserES5SymbolProperty8.errors.txt
new file mode 100644
index 0000000000000..ce7ce5b83190e
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty8.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty8.ts(2,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty8.ts(2,6): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty8.ts (2 errors) ====
+    var x: {
+        [Symbol.toPrimitive](): string
+        ~~~~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolProperty8.js b/tests/baselines/reference/parserES5SymbolProperty8.js
new file mode 100644
index 0000000000000..ed3a55db0f2df
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty8.js
@@ -0,0 +1,7 @@
+//// [parserES5SymbolProperty8.ts]
+var x: {
+    [Symbol.toPrimitive](): string
+}
+
+//// [parserES5SymbolProperty8.js]
+var x;
diff --git a/tests/baselines/reference/parserES5SymbolProperty9.errors.txt b/tests/baselines/reference/parserES5SymbolProperty9.errors.txt
new file mode 100644
index 0000000000000..90c3785c93845
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty9.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty9.ts(2,5): error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty9.ts(2,6): error TS2304: Cannot find name 'Symbol'.
+
+
+==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty9.ts (2 errors) ====
+    var x: {
+        [Symbol.toPrimitive]: string
+        ~~~~~~~~~~~~~~~~~~~~
+!!! error TS1167: Computed property names are only available when targeting ECMAScript 6 and higher.
+         ~~~~~~
+!!! error TS2304: Cannot find name 'Symbol'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserES5SymbolProperty9.js b/tests/baselines/reference/parserES5SymbolProperty9.js
new file mode 100644
index 0000000000000..4728765e5533e
--- /dev/null
+++ b/tests/baselines/reference/parserES5SymbolProperty9.js
@@ -0,0 +1,7 @@
+//// [parserES5SymbolProperty9.ts]
+var x: {
+    [Symbol.toPrimitive]: string
+}
+
+//// [parserES5SymbolProperty9.js]
+var x;
diff --git a/tests/baselines/reference/parserForStatement3.errors.txt b/tests/baselines/reference/parserForStatement3.errors.txt
index 533958505c11e..06c3f083d45ce 100644
--- a/tests/baselines/reference/parserForStatement3.errors.txt
+++ b/tests/baselines/reference/parserForStatement3.errors.txt
@@ -1,5 +1,4 @@
 tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement3.ts(1,5): error TS2304: Cannot find name 'd'.
-tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement3.ts(1,5): error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
 tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement3.ts(1,10): error TS2304: Cannot find name '_'.
 tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement3.ts(1,15): error TS2304: Cannot find name 'a'.
 tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement3.ts(1,18): error TS2304: Cannot find name '_'.
@@ -7,12 +6,10 @@ tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement3.ts(1,2
 tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement3.ts(1,30): error TS2304: Cannot find name 'b'.
 
 
-==== tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement3.ts (7 errors) ====
+==== tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement3.ts (6 errors) ====
     for(d in _.jh[a]=_.jh[a]||[],b);
         ~
 !!! error TS2304: Cannot find name 'd'.
-        ~
-!!! error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
              ~
 !!! error TS2304: Cannot find name '_'.
                   ~
diff --git a/tests/baselines/reference/parserForStatement6.errors.txt b/tests/baselines/reference/parserForStatement6.errors.txt
index a098141c81b3d..a41f103e929ca 100644
--- a/tests/baselines/reference/parserForStatement6.errors.txt
+++ b/tests/baselines/reference/parserForStatement6.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement6.ts(1,6): error TS2304: Cannot find name 'foo'.
-tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement6.ts(1,6): error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
+tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement6.ts(1,6): error TS2406: Invalid left-hand side in 'for...in' statement.
 tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement6.ts(1,15): error TS2304: Cannot find name 'b'.
 
 
@@ -8,7 +8,7 @@ tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement6.ts(1,1
          ~~~
 !!! error TS2304: Cannot find name 'foo'.
          ~~~~~
-!!! error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
+!!! error TS2406: Invalid left-hand side in 'for...in' statement.
                   ~
 !!! error TS2304: Cannot find name 'b'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserForStatement7.errors.txt b/tests/baselines/reference/parserForStatement7.errors.txt
index da1f1ce6808f7..3aa67480105aa 100644
--- a/tests/baselines/reference/parserForStatement7.errors.txt
+++ b/tests/baselines/reference/parserForStatement7.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement7.ts(1,6): error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
+tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement7.ts(1,6): error TS2406: Invalid left-hand side in 'for...in' statement.
 tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement7.ts(1,10): error TS2304: Cannot find name 'foo'.
 tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement7.ts(1,19): error TS2304: Cannot find name 'b'.
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement7.ts(1,1
 ==== tests/cases/conformance/parser/ecmascript5/Statements/parserForStatement7.ts (3 errors) ====
     for (new foo() in b) {
          ~~~~~~~~~
-!!! error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
+!!! error TS2406: Invalid left-hand side in 'for...in' statement.
              ~~~
 !!! error TS2304: Cannot find name 'foo'.
                       ~
diff --git a/tests/baselines/reference/parserIndexSignature11.errors.txt b/tests/baselines/reference/parserIndexSignature11.errors.txt
index 8cf474b19bb1d..f1f2a4a00f465 100644
--- a/tests/baselines/reference/parserIndexSignature11.errors.txt
+++ b/tests/baselines/reference/parserIndexSignature11.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature11.ts(2,9): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature11.ts(2,9): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature11.ts(2,10): error TS2304: Cannot find name 'p'.
 tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature11.ts(3,9): error TS1021: An index signature must have a type annotation.
 tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature11.ts(4,10): error TS1096: An index signature must have exactly one parameter.
@@ -8,7 +8,7 @@ tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature1
     interface I {
             [p]; // Used to be indexer, now it is a computed property
             ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
              ~
 !!! error TS2304: Cannot find name 'p'.
             [p1: string];
diff --git a/tests/baselines/reference/parserIndexSignature4.errors.txt b/tests/baselines/reference/parserIndexSignature4.errors.txt
index d625f27eb6fc6..bd73b4d2bf451 100644
--- a/tests/baselines/reference/parserIndexSignature4.errors.txt
+++ b/tests/baselines/reference/parserIndexSignature4.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature4.ts(2,3): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature4.ts(2,3): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature4.ts(2,4): error TS2304: Cannot find name 'a'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature4
     interface I {
       [a = 0] // Used to be indexer, now it is a computed property
       ~~~~~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
        ~
 !!! error TS2304: Cannot find name 'a'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserIndexSignature5.errors.txt b/tests/baselines/reference/parserIndexSignature5.errors.txt
index 3f3415973d962..54ccd05f4f99f 100644
--- a/tests/baselines/reference/parserIndexSignature5.errors.txt
+++ b/tests/baselines/reference/parserIndexSignature5.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature5.ts(2,3): error TS1169: Computed property names are not allowed in interfaces.
+tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature5.ts(2,3): error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
 tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature5.ts(2,4): error TS2304: Cannot find name 'a'.
 
 
@@ -6,7 +6,7 @@ tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature5
     interface I {
       [a] // Used to be indexer, now it is a computed property
       ~~~
-!!! error TS1169: Computed property names are not allowed in interfaces.
+!!! error TS1169: A computed property name in an interface must directly refer to a built-in symbol.
        ~
 !!! error TS2304: Cannot find name 'a'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserSymbolIndexer1.errors.txt b/tests/baselines/reference/parserSymbolIndexer1.errors.txt
new file mode 100644
index 0000000000000..5c6c38d52b122
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolIndexer1.errors.txt
@@ -0,0 +1,9 @@
+tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer1.ts(2,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer1.ts (1 errors) ====
+    interface I {
+        [s: symbol]: string;
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserSymbolIndexer1.js b/tests/baselines/reference/parserSymbolIndexer1.js
new file mode 100644
index 0000000000000..752391dad5355
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolIndexer1.js
@@ -0,0 +1,6 @@
+//// [parserSymbolIndexer1.ts]
+interface I {
+    [s: symbol]: string;
+}
+
+//// [parserSymbolIndexer1.js]
diff --git a/tests/baselines/reference/parserSymbolIndexer2.errors.txt b/tests/baselines/reference/parserSymbolIndexer2.errors.txt
new file mode 100644
index 0000000000000..3961f4942de4b
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolIndexer2.errors.txt
@@ -0,0 +1,9 @@
+tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer2.ts(2,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer2.ts (1 errors) ====
+    class C {
+        [s: symbol]: string;
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserSymbolIndexer2.js b/tests/baselines/reference/parserSymbolIndexer2.js
new file mode 100644
index 0000000000000..563614e1c8cf7
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolIndexer2.js
@@ -0,0 +1,11 @@
+//// [parserSymbolIndexer2.ts]
+class C {
+    [s: symbol]: string;
+}
+
+//// [parserSymbolIndexer2.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
diff --git a/tests/baselines/reference/parserSymbolIndexer3.errors.txt b/tests/baselines/reference/parserSymbolIndexer3.errors.txt
new file mode 100644
index 0000000000000..5484a096d4ce0
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolIndexer3.errors.txt
@@ -0,0 +1,9 @@
+tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer3.ts(2,13): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer3.ts (1 errors) ====
+    class C {
+        static [s: symbol]: string;
+                ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserSymbolIndexer3.js b/tests/baselines/reference/parserSymbolIndexer3.js
new file mode 100644
index 0000000000000..917945193aee0
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolIndexer3.js
@@ -0,0 +1,11 @@
+//// [parserSymbolIndexer3.ts]
+class C {
+    static [s: symbol]: string;
+}
+
+//// [parserSymbolIndexer3.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
diff --git a/tests/baselines/reference/parserSymbolIndexer4.errors.txt b/tests/baselines/reference/parserSymbolIndexer4.errors.txt
new file mode 100644
index 0000000000000..1cf184a48472b
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolIndexer4.errors.txt
@@ -0,0 +1,9 @@
+tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer4.ts(2,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer4.ts (1 errors) ====
+    var x: {
+        [s: symbol]: string;
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/parserSymbolIndexer4.js b/tests/baselines/reference/parserSymbolIndexer4.js
new file mode 100644
index 0000000000000..21367ca596955
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolIndexer4.js
@@ -0,0 +1,7 @@
+//// [parserSymbolIndexer4.ts]
+var x: {
+    [s: symbol]: string;
+}
+
+//// [parserSymbolIndexer4.js]
+var x;
diff --git a/tests/baselines/reference/parserSymbolIndexer5.errors.txt b/tests/baselines/reference/parserSymbolIndexer5.errors.txt
new file mode 100644
index 0000000000000..a8c19338e017b
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolIndexer5.errors.txt
@@ -0,0 +1,24 @@
+tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer5.ts(2,6): error TS2304: Cannot find name 's'.
+tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer5.ts(2,7): error TS1005: ']' expected.
+tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer5.ts(2,9): error TS2304: Cannot find name 'symbol'.
+tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer5.ts(2,15): error TS1005: ',' expected.
+tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer5.ts(2,16): error TS1136: Property assignment expected.
+tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer5.ts(3,1): error TS1005: ':' expected.
+
+
+==== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer5.ts (6 errors) ====
+    var x = {
+        [s: symbol]: ""
+         ~
+!!! error TS2304: Cannot find name 's'.
+          ~
+!!! error TS1005: ']' expected.
+            ~~~~~~
+!!! error TS2304: Cannot find name 'symbol'.
+                  ~
+!!! error TS1005: ',' expected.
+                   ~
+!!! error TS1136: Property assignment expected.
+    }
+    ~
+!!! error TS1005: ':' expected.
\ No newline at end of file
diff --git a/tests/baselines/reference/parserSymbolIndexer5.js b/tests/baselines/reference/parserSymbolIndexer5.js
new file mode 100644
index 0000000000000..43c456b64aa23
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolIndexer5.js
@@ -0,0 +1,10 @@
+//// [parserSymbolIndexer5.ts]
+var x = {
+    [s: symbol]: ""
+}
+
+//// [parserSymbolIndexer5.js]
+var x = {
+    [s]: symbol,
+    "": 
+};
diff --git a/tests/baselines/reference/parserSymbolProperty1.js b/tests/baselines/reference/parserSymbolProperty1.js
new file mode 100644
index 0000000000000..6bcede608fbf9
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty1.js
@@ -0,0 +1,6 @@
+//// [parserSymbolProperty1.ts]
+interface I {
+    [Symbol.iterator]: string;
+}
+
+//// [parserSymbolProperty1.js]
diff --git a/tests/baselines/reference/parserSymbolProperty1.types b/tests/baselines/reference/parserSymbolProperty1.types
new file mode 100644
index 0000000000000..6c0cd75cf59a7
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty1.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty1.ts ===
+interface I {
+>I : I
+
+    [Symbol.iterator]: string;
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+}
diff --git a/tests/baselines/reference/parserSymbolProperty2.js b/tests/baselines/reference/parserSymbolProperty2.js
new file mode 100644
index 0000000000000..6530072d46f5b
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty2.js
@@ -0,0 +1,6 @@
+//// [parserSymbolProperty2.ts]
+interface I {
+    [Symbol.unscopables](): string;
+}
+
+//// [parserSymbolProperty2.js]
diff --git a/tests/baselines/reference/parserSymbolProperty2.types b/tests/baselines/reference/parserSymbolProperty2.types
new file mode 100644
index 0000000000000..bcf14b83a2ae2
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty2.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty2.ts ===
+interface I {
+>I : I
+
+    [Symbol.unscopables](): string;
+>Symbol.unscopables : symbol
+>Symbol : SymbolConstructor
+>unscopables : symbol
+}
diff --git a/tests/baselines/reference/parserSymbolProperty3.js b/tests/baselines/reference/parserSymbolProperty3.js
new file mode 100644
index 0000000000000..5b1b48254b1ee
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty3.js
@@ -0,0 +1,6 @@
+//// [parserSymbolProperty3.ts]
+declare class C {
+    [Symbol.unscopables](): string;
+}
+
+//// [parserSymbolProperty3.js]
diff --git a/tests/baselines/reference/parserSymbolProperty3.types b/tests/baselines/reference/parserSymbolProperty3.types
new file mode 100644
index 0000000000000..977375d7393f9
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty3.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty3.ts ===
+declare class C {
+>C : C
+
+    [Symbol.unscopables](): string;
+>Symbol.unscopables : symbol
+>Symbol : SymbolConstructor
+>unscopables : symbol
+}
diff --git a/tests/baselines/reference/parserSymbolProperty4.js b/tests/baselines/reference/parserSymbolProperty4.js
new file mode 100644
index 0000000000000..f79db0b1d79b0
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty4.js
@@ -0,0 +1,6 @@
+//// [parserSymbolProperty4.ts]
+declare class C {
+    [Symbol.isRegExp]: string;
+}
+
+//// [parserSymbolProperty4.js]
diff --git a/tests/baselines/reference/parserSymbolProperty4.types b/tests/baselines/reference/parserSymbolProperty4.types
new file mode 100644
index 0000000000000..a9070897fa879
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty4.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty4.ts ===
+declare class C {
+>C : C
+
+    [Symbol.isRegExp]: string;
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+}
diff --git a/tests/baselines/reference/parserSymbolProperty5.js b/tests/baselines/reference/parserSymbolProperty5.js
new file mode 100644
index 0000000000000..922e1fb0323ba
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty5.js
@@ -0,0 +1,11 @@
+//// [parserSymbolProperty5.ts]
+class C {
+    [Symbol.isRegExp]: string;
+}
+
+//// [parserSymbolProperty5.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
diff --git a/tests/baselines/reference/parserSymbolProperty5.types b/tests/baselines/reference/parserSymbolProperty5.types
new file mode 100644
index 0000000000000..8a171598e8342
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty5.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty5.ts ===
+class C {
+>C : C
+
+    [Symbol.isRegExp]: string;
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+}
diff --git a/tests/baselines/reference/parserSymbolProperty6.js b/tests/baselines/reference/parserSymbolProperty6.js
new file mode 100644
index 0000000000000..cbc06cd295173
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty6.js
@@ -0,0 +1,12 @@
+//// [parserSymbolProperty6.ts]
+class C {
+    [Symbol.toStringTag]: string = "";
+}
+
+//// [parserSymbolProperty6.js]
+var C = (function () {
+    function C() {
+        this[Symbol.toStringTag] = "";
+    }
+    return C;
+})();
diff --git a/tests/baselines/reference/parserSymbolProperty6.types b/tests/baselines/reference/parserSymbolProperty6.types
new file mode 100644
index 0000000000000..660cbf4e545ac
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty6.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty6.ts ===
+class C {
+>C : C
+
+    [Symbol.toStringTag]: string = "";
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+}
diff --git a/tests/baselines/reference/parserSymbolProperty7.js b/tests/baselines/reference/parserSymbolProperty7.js
new file mode 100644
index 0000000000000..9368fd1285564
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty7.js
@@ -0,0 +1,12 @@
+//// [parserSymbolProperty7.ts]
+class C {
+    [Symbol.toStringTag](): void { }
+}
+
+//// [parserSymbolProperty7.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.toStringTag] = function () { };
+    return C;
+})();
diff --git a/tests/baselines/reference/parserSymbolProperty7.types b/tests/baselines/reference/parserSymbolProperty7.types
new file mode 100644
index 0000000000000..f8dc2523692f0
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty7.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty7.ts ===
+class C {
+>C : C
+
+    [Symbol.toStringTag](): void { }
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+}
diff --git a/tests/baselines/reference/parserSymbolProperty8.js b/tests/baselines/reference/parserSymbolProperty8.js
new file mode 100644
index 0000000000000..f312ede6b1d3e
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty8.js
@@ -0,0 +1,7 @@
+//// [parserSymbolProperty8.ts]
+var x: {
+    [Symbol.toPrimitive](): string
+}
+
+//// [parserSymbolProperty8.js]
+var x;
diff --git a/tests/baselines/reference/parserSymbolProperty8.types b/tests/baselines/reference/parserSymbolProperty8.types
new file mode 100644
index 0000000000000..06387c9c231e0
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty8.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty8.ts ===
+var x: {
+>x : { [Symbol.toPrimitive](): string; }
+
+    [Symbol.toPrimitive](): string
+>Symbol.toPrimitive : symbol
+>Symbol : SymbolConstructor
+>toPrimitive : symbol
+}
diff --git a/tests/baselines/reference/parserSymbolProperty9.js b/tests/baselines/reference/parserSymbolProperty9.js
new file mode 100644
index 0000000000000..6efc6650ea0d0
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty9.js
@@ -0,0 +1,7 @@
+//// [parserSymbolProperty9.ts]
+var x: {
+    [Symbol.toPrimitive]: string
+}
+
+//// [parserSymbolProperty9.js]
+var x;
diff --git a/tests/baselines/reference/parserSymbolProperty9.types b/tests/baselines/reference/parserSymbolProperty9.types
new file mode 100644
index 0000000000000..40fbde2acff65
--- /dev/null
+++ b/tests/baselines/reference/parserSymbolProperty9.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty9.ts ===
+var x: {
+>x : { [Symbol.toPrimitive]: string; }
+
+    [Symbol.toPrimitive]: string
+>Symbol.toPrimitive : symbol
+>Symbol : SymbolConstructor
+>toPrimitive : symbol
+}
diff --git a/tests/baselines/reference/propertyAccess.errors.txt b/tests/baselines/reference/propertyAccess.errors.txt
index 5cffcbec64c40..d9cd90a48fcd9 100644
--- a/tests/baselines/reference/propertyAccess.errors.txt
+++ b/tests/baselines/reference/propertyAccess.errors.txt
@@ -1,7 +1,7 @@
 tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts(45,14): error TS2339: Property 'qqq' does not exist on type '{ 10: string; x: string; y: number; z: { n: string; m: number; o: () => boolean; }; 'literal property': number; }'.
-tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts(80,10): error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts(117,10): error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
-tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts(140,12): error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
+tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts(80,10): error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
+tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts(117,10): error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
+tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts(140,12): error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
 
 
 ==== tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts (4 errors) ====
@@ -88,7 +88,7 @@ tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts(140,12): er
     // Bracket notation property access using value of other type on type with numeric index signature and no string index signature
     var ll = numIndex[someObject]; // Error
              ~~~~~~~~~~~~~~~~~~~~
-!!! error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
+!!! error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
     
     // Bracket notation property access using string value on type with string index signature and no numeric index signature
     var mm = strIndex['N'];
@@ -127,7 +127,7 @@ tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts(140,12): er
     // Bracket notation property access using values of other types on type with no index signatures
     var uu = noIndex[someObject]; // Error
              ~~~~~~~~~~~~~~~~~~~
-!!! error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
+!!! error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
     
     // Bracket notation property access using numeric value on type with numeric index signature and string index signature
     var vv = noIndex[32];
@@ -152,7 +152,7 @@ tests/cases/conformance/expressions/propertyAccess/propertyAccess.ts(140,12): er
     // Bracket notation property access using value of other type on type with numeric index signature and no string index signature and string index signature
     var zzzz = bothIndex[someObject]; // Error
                ~~~~~~~~~~~~~~~~~~~~~
-!!! error TS2342: An index expression argument must be of type 'string', 'number', or 'any'.
+!!! error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
     
     var x1 = numIndex[stringOrNumber];
     var x1: any;
diff --git a/tests/baselines/reference/propertyAssignment.errors.txt b/tests/baselines/reference/propertyAssignment.errors.txt
index 51850754a9aa0..47359caf9c255 100644
--- a/tests/baselines/reference/propertyAssignment.errors.txt
+++ b/tests/baselines/reference/propertyAssignment.errors.txt
@@ -1,4 +1,4 @@
-tests/cases/compiler/propertyAssignment.ts(6,13): error TS1170: Computed property names are not allowed in type literals.
+tests/cases/compiler/propertyAssignment.ts(6,13): error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
 tests/cases/compiler/propertyAssignment.ts(6,14): error TS2304: Cannot find name 'index'.
 tests/cases/compiler/propertyAssignment.ts(14,1): error TS2322: Type '{ x: number; }' is not assignable to type 'new () => any'.
 tests/cases/compiler/propertyAssignment.ts(16,1): error TS2322: Type '{ x: number; }' is not assignable to type '() => void'.
@@ -12,7 +12,7 @@ tests/cases/compiler/propertyAssignment.ts(16,1): error TS2322: Type '{ x: numbe
     
     var foo2: { [index]; } // should be an error, used to be indexer, now it is a computed property
                 ~~~~~~~
-!!! error TS1170: Computed property names are not allowed in type literals.
+!!! error TS1170: A computed property name in a type literal must directly refer to a built-in symbol.
                  ~~~~~
 !!! error TS2304: Cannot find name 'index'.
     var bar2: { x : number; }
diff --git a/tests/baselines/reference/shadowingViaLocalValue.errors.txt b/tests/baselines/reference/shadowingViaLocalValue.errors.txt
index 5e683d3ee6ff8..8e6f16b91ccf5 100644
--- a/tests/baselines/reference/shadowingViaLocalValue.errors.txt
+++ b/tests/baselines/reference/shadowingViaLocalValue.errors.txt
@@ -1,7 +1,7 @@
 tests/cases/compiler/shadowingViaLocalValue.ts(2,5): error TS1153: 'let' declarations are only available when targeting ECMAScript 6 and higher.
-tests/cases/compiler/shadowingViaLocalValue.ts(4,13): error TS2477: Cannot initialize outer scoped variable 'x' in the same scope as block scoped declaration 'x'.
+tests/cases/compiler/shadowingViaLocalValue.ts(4,13): error TS2481: Cannot initialize outer scoped variable 'x' in the same scope as block scoped declaration 'x'.
 tests/cases/compiler/shadowingViaLocalValue.ts(9,5): error TS1153: 'let' declarations are only available when targeting ECMAScript 6 and higher.
-tests/cases/compiler/shadowingViaLocalValue.ts(11,18): error TS2477: Cannot initialize outer scoped variable 'x1' in the same scope as block scoped declaration 'x1'.
+tests/cases/compiler/shadowingViaLocalValue.ts(11,18): error TS2481: Cannot initialize outer scoped variable 'x1' in the same scope as block scoped declaration 'x1'.
 
 
 ==== tests/cases/compiler/shadowingViaLocalValue.ts (4 errors) ====
@@ -12,7 +12,7 @@ tests/cases/compiler/shadowingViaLocalValue.ts(11,18): error TS2477: Cannot init
         {
             var x = 1;
                 ~
-!!! error TS2477: Cannot initialize outer scoped variable 'x' in the same scope as block scoped declaration 'x'.
+!!! error TS2481: Cannot initialize outer scoped variable 'x' in the same scope as block scoped declaration 'x'.
         }
     }
     
@@ -23,7 +23,7 @@ tests/cases/compiler/shadowingViaLocalValue.ts(11,18): error TS2477: Cannot init
         {
             for (var x1 = 0; ;);
                      ~~
-!!! error TS2477: Cannot initialize outer scoped variable 'x1' in the same scope as block scoped declaration 'x1'.
+!!! error TS2481: Cannot initialize outer scoped variable 'x1' in the same scope as block scoped declaration 'x1'.
         }
     }
     
diff --git a/tests/baselines/reference/symbolDeclarationEmit1.js b/tests/baselines/reference/symbolDeclarationEmit1.js
new file mode 100644
index 0000000000000..16d208db5eb86
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit1.js
@@ -0,0 +1,17 @@
+//// [symbolDeclarationEmit1.ts]
+class C {
+    [Symbol.isRegExp]: number;
+}
+
+//// [symbolDeclarationEmit1.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
+
+
+//// [symbolDeclarationEmit1.d.ts]
+declare class C {
+    [Symbol.isRegExp]: number;
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit1.types b/tests/baselines/reference/symbolDeclarationEmit1.types
new file mode 100644
index 0000000000000..e35bbfe886136
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit1.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit1.ts ===
+class C {
+>C : C
+
+    [Symbol.isRegExp]: number;
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit10.js b/tests/baselines/reference/symbolDeclarationEmit10.js
new file mode 100644
index 0000000000000..090adc03a1cf3
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit10.js
@@ -0,0 +1,19 @@
+//// [symbolDeclarationEmit10.ts]
+var obj = {
+    get [Symbol.isConcatSpreadable]() { return '' },
+    set [Symbol.isConcatSpreadable](x) { }
+}
+
+//// [symbolDeclarationEmit10.js]
+var obj = {
+    get [Symbol.isConcatSpreadable]() {
+        return '';
+    },
+    set [Symbol.isConcatSpreadable](x) { }
+};
+
+
+//// [symbolDeclarationEmit10.d.ts]
+declare var obj: {
+    [Symbol.isConcatSpreadable]: string;
+};
diff --git a/tests/baselines/reference/symbolDeclarationEmit10.types b/tests/baselines/reference/symbolDeclarationEmit10.types
new file mode 100644
index 0000000000000..194893ef00f80
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit10.types
@@ -0,0 +1,16 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit10.ts ===
+var obj = {
+>obj : { [Symbol.isConcatSpreadable]: string; }
+>{    get [Symbol.isConcatSpreadable]() { return '' },    set [Symbol.isConcatSpreadable](x) { }} : { [Symbol.isConcatSpreadable]: string; }
+
+    get [Symbol.isConcatSpreadable]() { return '' },
+>Symbol.isConcatSpreadable : symbol
+>Symbol : SymbolConstructor
+>isConcatSpreadable : symbol
+
+    set [Symbol.isConcatSpreadable](x) { }
+>Symbol.isConcatSpreadable : symbol
+>Symbol : SymbolConstructor
+>isConcatSpreadable : symbol
+>x : string
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit11.js b/tests/baselines/reference/symbolDeclarationEmit11.js
new file mode 100644
index 0000000000000..eeaf66db3e058
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit11.js
@@ -0,0 +1,32 @@
+//// [symbolDeclarationEmit11.ts]
+class C {
+    static [Symbol.iterator] = 0;
+    static [Symbol.toPrimitive]() { }
+    static get [Symbol.isRegExp]() { return ""; }
+    static set [Symbol.isRegExp](x) { }
+}
+
+//// [symbolDeclarationEmit11.js]
+var C = (function () {
+    function C() {
+    }
+    C[Symbol.toPrimitive] = function () { };
+    Object.defineProperty(C, Symbol.isRegExp, {
+        get: function () {
+            return "";
+        },
+        set: function (x) { },
+        enumerable: true,
+        configurable: true
+    });
+    C[Symbol.iterator] = 0;
+    return C;
+})();
+
+
+//// [symbolDeclarationEmit11.d.ts]
+declare class C {
+    static [Symbol.iterator]: number;
+    static [Symbol.toPrimitive](): void;
+    static [Symbol.isRegExp]: string;
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit11.types b/tests/baselines/reference/symbolDeclarationEmit11.types
new file mode 100644
index 0000000000000..1bf58f205d1da
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit11.types
@@ -0,0 +1,25 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit11.ts ===
+class C {
+>C : C
+
+    static [Symbol.iterator] = 0;
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+    static [Symbol.toPrimitive]() { }
+>Symbol.toPrimitive : symbol
+>Symbol : SymbolConstructor
+>toPrimitive : symbol
+
+    static get [Symbol.isRegExp]() { return ""; }
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+
+    static set [Symbol.isRegExp](x) { }
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+>x : string
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit12.errors.txt b/tests/baselines/reference/symbolDeclarationEmit12.errors.txt
new file mode 100644
index 0000000000000..0e2f6b828f656
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit12.errors.txt
@@ -0,0 +1,27 @@
+tests/cases/conformance/es6/Symbols/symbolDeclarationEmit12.ts(4,28): error TS4031: Public property '[Symbol.iterator]' of exported class has or is using private name 'I'.
+tests/cases/conformance/es6/Symbols/symbolDeclarationEmit12.ts(5,33): error TS4073: Parameter 'x' of public method from exported class has or is using private name 'I'.
+tests/cases/conformance/es6/Symbols/symbolDeclarationEmit12.ts(6,40): error TS4055: Return type of public method from exported class has or is using private name 'I'.
+tests/cases/conformance/es6/Symbols/symbolDeclarationEmit12.ts(10,34): error TS4037: Parameter '[Symbol.isRegExp]' of public property setter from exported class has or is using private name 'I'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit12.ts (4 errors) ====
+    module M {
+        interface I { }
+        export class C {
+            [Symbol.iterator]: I;
+                               ~
+!!! error TS4031: Public property '[Symbol.iterator]' of exported class has or is using private name 'I'.
+            [Symbol.toPrimitive](x: I) { }
+                                    ~
+!!! error TS4073: Parameter 'x' of public method from exported class has or is using private name 'I'.
+            [Symbol.isConcatSpreadable](): I {
+                                           ~
+!!! error TS4055: Return type of public method from exported class has or is using private name 'I'.
+                return undefined
+            }
+            get [Symbol.isRegExp]() { return undefined; }
+            set [Symbol.isRegExp](x: I) { }
+                                     ~
+!!! error TS4037: Parameter '[Symbol.isRegExp]' of public property setter from exported class has or is using private name 'I'.
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolDeclarationEmit12.js b/tests/baselines/reference/symbolDeclarationEmit12.js
new file mode 100644
index 0000000000000..e39e62f62ed3d
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit12.js
@@ -0,0 +1,36 @@
+//// [symbolDeclarationEmit12.ts]
+module M {
+    interface I { }
+    export class C {
+        [Symbol.iterator]: I;
+        [Symbol.toPrimitive](x: I) { }
+        [Symbol.isConcatSpreadable](): I {
+            return undefined
+        }
+        get [Symbol.isRegExp]() { return undefined; }
+        set [Symbol.isRegExp](x: I) { }
+    }
+}
+
+//// [symbolDeclarationEmit12.js]
+var M;
+(function (M) {
+    var C = (function () {
+        function C() {
+        }
+        C.prototype[Symbol.toPrimitive] = function (x) { };
+        C.prototype[Symbol.isConcatSpreadable] = function () {
+            return undefined;
+        };
+        Object.defineProperty(C.prototype, Symbol.isRegExp, {
+            get: function () {
+                return undefined;
+            },
+            set: function (x) { },
+            enumerable: true,
+            configurable: true
+        });
+        return C;
+    })();
+    M.C = C;
+})(M || (M = {}));
diff --git a/tests/baselines/reference/symbolDeclarationEmit13.js b/tests/baselines/reference/symbolDeclarationEmit13.js
new file mode 100644
index 0000000000000..83e2a2501e4c9
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit13.js
@@ -0,0 +1,31 @@
+//// [symbolDeclarationEmit13.ts]
+class C {
+    get [Symbol.isRegExp]() { return ""; }
+    set [Symbol.toStringTag](x) { }
+}
+
+//// [symbolDeclarationEmit13.js]
+var C = (function () {
+    function C() {
+    }
+    Object.defineProperty(C.prototype, Symbol.isRegExp, {
+        get: function () {
+            return "";
+        },
+        enumerable: true,
+        configurable: true
+    });
+    Object.defineProperty(C.prototype, Symbol.toStringTag, {
+        set: function (x) { },
+        enumerable: true,
+        configurable: true
+    });
+    return C;
+})();
+
+
+//// [symbolDeclarationEmit13.d.ts]
+declare class C {
+    [Symbol.isRegExp]: string;
+    [Symbol.toStringTag]: any;
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit13.types b/tests/baselines/reference/symbolDeclarationEmit13.types
new file mode 100644
index 0000000000000..6579e49c42619
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit13.types
@@ -0,0 +1,15 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit13.ts ===
+class C {
+>C : C
+
+    get [Symbol.isRegExp]() { return ""; }
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+
+    set [Symbol.toStringTag](x) { }
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+>x : any
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit14.js b/tests/baselines/reference/symbolDeclarationEmit14.js
new file mode 100644
index 0000000000000..d81bc329927d0
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit14.js
@@ -0,0 +1,33 @@
+//// [symbolDeclarationEmit14.ts]
+class C {
+    get [Symbol.isRegExp]() { return ""; }
+    get [Symbol.toStringTag]() { return ""; }
+}
+
+//// [symbolDeclarationEmit14.js]
+var C = (function () {
+    function C() {
+    }
+    Object.defineProperty(C.prototype, Symbol.isRegExp, {
+        get: function () {
+            return "";
+        },
+        enumerable: true,
+        configurable: true
+    });
+    Object.defineProperty(C.prototype, Symbol.toStringTag, {
+        get: function () {
+            return "";
+        },
+        enumerable: true,
+        configurable: true
+    });
+    return C;
+})();
+
+
+//// [symbolDeclarationEmit14.d.ts]
+declare class C {
+    [Symbol.isRegExp]: string;
+    [Symbol.toStringTag]: string;
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit14.types b/tests/baselines/reference/symbolDeclarationEmit14.types
new file mode 100644
index 0000000000000..f3e7c32047c10
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit14.types
@@ -0,0 +1,14 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit14.ts ===
+class C {
+>C : C
+
+    get [Symbol.isRegExp]() { return ""; }
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+
+    get [Symbol.toStringTag]() { return ""; }
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit2.js b/tests/baselines/reference/symbolDeclarationEmit2.js
new file mode 100644
index 0000000000000..2112f9e774874
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit2.js
@@ -0,0 +1,18 @@
+//// [symbolDeclarationEmit2.ts]
+class C {
+    [Symbol.isRegExp] = "";
+}
+
+//// [symbolDeclarationEmit2.js]
+var C = (function () {
+    function C() {
+        this[Symbol.isRegExp] = "";
+    }
+    return C;
+})();
+
+
+//// [symbolDeclarationEmit2.d.ts]
+declare class C {
+    [Symbol.isRegExp]: string;
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit2.types b/tests/baselines/reference/symbolDeclarationEmit2.types
new file mode 100644
index 0000000000000..4844b2b8f848e
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit2.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit2.ts ===
+class C {
+>C : C
+
+    [Symbol.isRegExp] = "";
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit3.js b/tests/baselines/reference/symbolDeclarationEmit3.js
new file mode 100644
index 0000000000000..e3b22d883c8f7
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit3.js
@@ -0,0 +1,21 @@
+//// [symbolDeclarationEmit3.ts]
+class C {
+    [Symbol.isRegExp](x: number);
+    [Symbol.isRegExp](x: string);
+    [Symbol.isRegExp](x: any) { }
+}
+
+//// [symbolDeclarationEmit3.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.isRegExp] = function (x) { };
+    return C;
+})();
+
+
+//// [symbolDeclarationEmit3.d.ts]
+declare class C {
+    [Symbol.isRegExp](x: number): any;
+    [Symbol.isRegExp](x: string): any;
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit3.types b/tests/baselines/reference/symbolDeclarationEmit3.types
new file mode 100644
index 0000000000000..0ea55d876b3db
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit3.types
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit3.ts ===
+class C {
+>C : C
+
+    [Symbol.isRegExp](x: number);
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+>x : number
+
+    [Symbol.isRegExp](x: string);
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+>x : string
+
+    [Symbol.isRegExp](x: any) { }
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+>x : any
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit4.js b/tests/baselines/reference/symbolDeclarationEmit4.js
new file mode 100644
index 0000000000000..85906167b11dd
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit4.js
@@ -0,0 +1,26 @@
+//// [symbolDeclarationEmit4.ts]
+class C {
+    get [Symbol.isRegExp]() { return ""; }
+    set [Symbol.isRegExp](x) { }
+}
+
+//// [symbolDeclarationEmit4.js]
+var C = (function () {
+    function C() {
+    }
+    Object.defineProperty(C.prototype, Symbol.isRegExp, {
+        get: function () {
+            return "";
+        },
+        set: function (x) { },
+        enumerable: true,
+        configurable: true
+    });
+    return C;
+})();
+
+
+//// [symbolDeclarationEmit4.d.ts]
+declare class C {
+    [Symbol.isRegExp]: string;
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit4.types b/tests/baselines/reference/symbolDeclarationEmit4.types
new file mode 100644
index 0000000000000..aeb24fc146cb9
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit4.types
@@ -0,0 +1,15 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit4.ts ===
+class C {
+>C : C
+
+    get [Symbol.isRegExp]() { return ""; }
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+
+    set [Symbol.isRegExp](x) { }
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+>x : string
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit5.js b/tests/baselines/reference/symbolDeclarationEmit5.js
new file mode 100644
index 0000000000000..ba1ef9a137c31
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit5.js
@@ -0,0 +1,12 @@
+//// [symbolDeclarationEmit5.ts]
+interface I {
+    [Symbol.isConcatSpreadable](): string;
+}
+
+//// [symbolDeclarationEmit5.js]
+
+
+//// [symbolDeclarationEmit5.d.ts]
+interface I {
+    [Symbol.isConcatSpreadable](): string;
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit5.types b/tests/baselines/reference/symbolDeclarationEmit5.types
new file mode 100644
index 0000000000000..557483cf63631
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit5.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit5.ts ===
+interface I {
+>I : I
+
+    [Symbol.isConcatSpreadable](): string;
+>Symbol.isConcatSpreadable : symbol
+>Symbol : SymbolConstructor
+>isConcatSpreadable : symbol
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit6.js b/tests/baselines/reference/symbolDeclarationEmit6.js
new file mode 100644
index 0000000000000..2aac05bb6eac3
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit6.js
@@ -0,0 +1,12 @@
+//// [symbolDeclarationEmit6.ts]
+interface I {
+    [Symbol.isConcatSpreadable]: string;
+}
+
+//// [symbolDeclarationEmit6.js]
+
+
+//// [symbolDeclarationEmit6.d.ts]
+interface I {
+    [Symbol.isConcatSpreadable]: string;
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit6.types b/tests/baselines/reference/symbolDeclarationEmit6.types
new file mode 100644
index 0000000000000..714467aba1207
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit6.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit6.ts ===
+interface I {
+>I : I
+
+    [Symbol.isConcatSpreadable]: string;
+>Symbol.isConcatSpreadable : symbol
+>Symbol : SymbolConstructor
+>isConcatSpreadable : symbol
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit7.js b/tests/baselines/reference/symbolDeclarationEmit7.js
new file mode 100644
index 0000000000000..c53c2110d1178
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit7.js
@@ -0,0 +1,13 @@
+//// [symbolDeclarationEmit7.ts]
+var obj: {
+    [Symbol.isConcatSpreadable]: string;
+}
+
+//// [symbolDeclarationEmit7.js]
+var obj;
+
+
+//// [symbolDeclarationEmit7.d.ts]
+declare var obj: {
+    [Symbol.isConcatSpreadable]: string;
+};
diff --git a/tests/baselines/reference/symbolDeclarationEmit7.types b/tests/baselines/reference/symbolDeclarationEmit7.types
new file mode 100644
index 0000000000000..dff109e81275f
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit7.types
@@ -0,0 +1,9 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit7.ts ===
+var obj: {
+>obj : { [Symbol.isConcatSpreadable]: string; }
+
+    [Symbol.isConcatSpreadable]: string;
+>Symbol.isConcatSpreadable : symbol
+>Symbol : SymbolConstructor
+>isConcatSpreadable : symbol
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit8.js b/tests/baselines/reference/symbolDeclarationEmit8.js
new file mode 100644
index 0000000000000..428d0a0d60c57
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit8.js
@@ -0,0 +1,15 @@
+//// [symbolDeclarationEmit8.ts]
+var obj = {
+    [Symbol.isConcatSpreadable]: 0
+}
+
+//// [symbolDeclarationEmit8.js]
+var obj = {
+    [Symbol.isConcatSpreadable]: 0
+};
+
+
+//// [symbolDeclarationEmit8.d.ts]
+declare var obj: {
+    [Symbol.isConcatSpreadable]: number;
+};
diff --git a/tests/baselines/reference/symbolDeclarationEmit8.types b/tests/baselines/reference/symbolDeclarationEmit8.types
new file mode 100644
index 0000000000000..75d39748e22ae
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit8.types
@@ -0,0 +1,10 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit8.ts ===
+var obj = {
+>obj : { [Symbol.isConcatSpreadable]: number; }
+>{    [Symbol.isConcatSpreadable]: 0} : { [Symbol.isConcatSpreadable]: number; }
+
+    [Symbol.isConcatSpreadable]: 0
+>Symbol.isConcatSpreadable : symbol
+>Symbol : SymbolConstructor
+>isConcatSpreadable : symbol
+}
diff --git a/tests/baselines/reference/symbolDeclarationEmit9.js b/tests/baselines/reference/symbolDeclarationEmit9.js
new file mode 100644
index 0000000000000..d38171767a588
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit9.js
@@ -0,0 +1,15 @@
+//// [symbolDeclarationEmit9.ts]
+var obj = {
+    [Symbol.isConcatSpreadable]() { }
+}
+
+//// [symbolDeclarationEmit9.js]
+var obj = {
+    [Symbol.isConcatSpreadable]() { }
+};
+
+
+//// [symbolDeclarationEmit9.d.ts]
+declare var obj: {
+    [Symbol.isConcatSpreadable](): void;
+};
diff --git a/tests/baselines/reference/symbolDeclarationEmit9.types b/tests/baselines/reference/symbolDeclarationEmit9.types
new file mode 100644
index 0000000000000..a7a6b459fcc06
--- /dev/null
+++ b/tests/baselines/reference/symbolDeclarationEmit9.types
@@ -0,0 +1,10 @@
+=== tests/cases/conformance/es6/Symbols/symbolDeclarationEmit9.ts ===
+var obj = {
+>obj : { [Symbol.isConcatSpreadable](): void; }
+>{    [Symbol.isConcatSpreadable]() { }} : { [Symbol.isConcatSpreadable](): void; }
+
+    [Symbol.isConcatSpreadable]() { }
+>Symbol.isConcatSpreadable : symbol
+>Symbol : SymbolConstructor
+>isConcatSpreadable : symbol
+}
diff --git a/tests/baselines/reference/symbolProperty1.js b/tests/baselines/reference/symbolProperty1.js
new file mode 100644
index 0000000000000..0117dd3b1c2a2
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty1.js
@@ -0,0 +1,19 @@
+//// [symbolProperty1.ts]
+var s: symbol;
+var x = {
+    [s]: 0,
+    [s]() { },
+    get [s]() {
+        return 0;
+    }
+}
+
+//// [symbolProperty1.js]
+var s;
+var x = {
+    [s]: 0,
+    [s]() { },
+    get [s]() {
+        return 0;
+    }
+};
diff --git a/tests/baselines/reference/symbolProperty1.types b/tests/baselines/reference/symbolProperty1.types
new file mode 100644
index 0000000000000..55c86c14f6e36
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty1.types
@@ -0,0 +1,20 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty1.ts ===
+var s: symbol;
+>s : symbol
+
+var x = {
+>x : {}
+>{    [s]: 0,    [s]() { },    get [s]() {        return 0;    }} : {}
+
+    [s]: 0,
+>s : symbol
+
+    [s]() { },
+>s : symbol
+
+    get [s]() {
+>s : symbol
+
+        return 0;
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty10.errors.txt b/tests/baselines/reference/symbolProperty10.errors.txt
new file mode 100644
index 0000000000000..513d5792c5eaf
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty10.errors.txt
@@ -0,0 +1,22 @@
+tests/cases/conformance/es6/Symbols/symbolProperty10.ts(10,5): error TS2322: Type 'I' is not assignable to type 'C'.
+  Types of property '[Symbol.iterator]' are incompatible.
+    Type '{ x: any; }' is not assignable to type '{ x: any; y: any; }'.
+      Property 'y' is missing in type '{ x: any; }'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty10.ts (1 errors) ====
+    class C {
+        [Symbol.iterator]: { x; y };
+    }
+    interface I {
+        [Symbol.iterator]?: { x };
+    }
+    
+    var i: I;
+    i = new C;
+    var c: C = i;
+        ~
+!!! error TS2322: Type 'I' is not assignable to type 'C'.
+!!! error TS2322:   Types of property '[Symbol.iterator]' are incompatible.
+!!! error TS2322:     Type '{ x: any; }' is not assignable to type '{ x: any; y: any; }'.
+!!! error TS2322:       Property 'y' is missing in type '{ x: any; }'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty10.js b/tests/baselines/reference/symbolProperty10.js
new file mode 100644
index 0000000000000..5b4e44f11abd8
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty10.js
@@ -0,0 +1,21 @@
+//// [symbolProperty10.ts]
+class C {
+    [Symbol.iterator]: { x; y };
+}
+interface I {
+    [Symbol.iterator]?: { x };
+}
+
+var i: I;
+i = new C;
+var c: C = i;
+
+//// [symbolProperty10.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
+var i;
+i = new C;
+var c = i;
diff --git a/tests/baselines/reference/symbolProperty11.js b/tests/baselines/reference/symbolProperty11.js
new file mode 100644
index 0000000000000..83a380c79e7c3
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty11.js
@@ -0,0 +1,19 @@
+//// [symbolProperty11.ts]
+class C { }
+interface I {
+    [Symbol.iterator]?: { x };
+}
+
+var i: I;
+i = new C;
+var c: C = i;
+
+//// [symbolProperty11.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
+var i;
+i = new C;
+var c = i;
diff --git a/tests/baselines/reference/symbolProperty11.types b/tests/baselines/reference/symbolProperty11.types
new file mode 100644
index 0000000000000..109bd969d5589
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty11.types
@@ -0,0 +1,29 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty11.ts ===
+class C { }
+>C : C
+
+interface I {
+>I : I
+
+    [Symbol.iterator]?: { x };
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : any
+}
+
+var i: I;
+>i : I
+>I : I
+
+i = new C;
+>i = new C : C
+>i : I
+>new C : C
+>C : typeof C
+
+var c: C = i;
+>c : C
+>C : C
+>i : I
+
diff --git a/tests/baselines/reference/symbolProperty12.errors.txt b/tests/baselines/reference/symbolProperty12.errors.txt
new file mode 100644
index 0000000000000..5ec8d6452035f
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty12.errors.txt
@@ -0,0 +1,23 @@
+tests/cases/conformance/es6/Symbols/symbolProperty12.ts(9,1): error TS2322: Type 'C' is not assignable to type 'I'.
+  Property '[Symbol.iterator]' is private in type 'C' but not in type 'I'.
+tests/cases/conformance/es6/Symbols/symbolProperty12.ts(10,5): error TS2322: Type 'I' is not assignable to type 'C'.
+  Property '[Symbol.iterator]' is private in type 'C' but not in type 'I'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty12.ts (2 errors) ====
+    class C {
+        private [Symbol.iterator]: { x };
+    }
+    interface I {
+        [Symbol.iterator]: { x };
+    }
+    
+    var i: I;
+    i = new C;
+    ~
+!!! error TS2322: Type 'C' is not assignable to type 'I'.
+!!! error TS2322:   Property '[Symbol.iterator]' is private in type 'C' but not in type 'I'.
+    var c: C = i;
+        ~
+!!! error TS2322: Type 'I' is not assignable to type 'C'.
+!!! error TS2322:   Property '[Symbol.iterator]' is private in type 'C' but not in type 'I'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty12.js b/tests/baselines/reference/symbolProperty12.js
new file mode 100644
index 0000000000000..9f63f86bc182b
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty12.js
@@ -0,0 +1,21 @@
+//// [symbolProperty12.ts]
+class C {
+    private [Symbol.iterator]: { x };
+}
+interface I {
+    [Symbol.iterator]: { x };
+}
+
+var i: I;
+i = new C;
+var c: C = i;
+
+//// [symbolProperty12.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
+var i;
+i = new C;
+var c = i;
diff --git a/tests/baselines/reference/symbolProperty13.js b/tests/baselines/reference/symbolProperty13.js
new file mode 100644
index 0000000000000..1cf24a49c7e2c
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty13.js
@@ -0,0 +1,27 @@
+//// [symbolProperty13.ts]
+class C {
+    [Symbol.iterator]: { x; y };
+}
+interface I {
+    [Symbol.iterator]: { x };
+}
+
+declare function foo(i: I): I;
+declare function foo(a: any): any;
+
+declare function bar(i: C): C;
+declare function bar(a: any): any;
+
+foo(new C);
+var i: I;
+bar(i);
+
+//// [symbolProperty13.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
+foo(new C);
+var i;
+bar(i);
diff --git a/tests/baselines/reference/symbolProperty13.types b/tests/baselines/reference/symbolProperty13.types
new file mode 100644
index 0000000000000..1e890a9108566
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty13.types
@@ -0,0 +1,56 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty13.ts ===
+class C {
+>C : C
+
+    [Symbol.iterator]: { x; y };
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : any
+>y : any
+}
+interface I {
+>I : I
+
+    [Symbol.iterator]: { x };
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : any
+}
+
+declare function foo(i: I): I;
+>foo : { (i: I): I; (a: any): any; }
+>i : I
+>I : I
+>I : I
+
+declare function foo(a: any): any;
+>foo : { (i: I): I; (a: any): any; }
+>a : any
+
+declare function bar(i: C): C;
+>bar : { (i: C): C; (a: any): any; }
+>i : C
+>C : C
+>C : C
+
+declare function bar(a: any): any;
+>bar : { (i: C): C; (a: any): any; }
+>a : any
+
+foo(new C);
+>foo(new C) : I
+>foo : { (i: I): I; (a: any): any; }
+>new C : C
+>C : typeof C
+
+var i: I;
+>i : I
+>I : I
+
+bar(i);
+>bar(i) : any
+>bar : { (i: C): C; (a: any): any; }
+>i : I
+
diff --git a/tests/baselines/reference/symbolProperty14.js b/tests/baselines/reference/symbolProperty14.js
new file mode 100644
index 0000000000000..0283cb01b792a
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty14.js
@@ -0,0 +1,27 @@
+//// [symbolProperty14.ts]
+class C {
+    [Symbol.iterator]: { x; y };
+}
+interface I {
+    [Symbol.iterator]?: { x };
+}
+
+declare function foo(i: I): I;
+declare function foo(a: any): any;
+
+declare function bar(i: C): C;
+declare function bar(a: any): any;
+
+foo(new C);
+var i: I;
+bar(i);
+
+//// [symbolProperty14.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
+foo(new C);
+var i;
+bar(i);
diff --git a/tests/baselines/reference/symbolProperty14.types b/tests/baselines/reference/symbolProperty14.types
new file mode 100644
index 0000000000000..5e5469ad9158b
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty14.types
@@ -0,0 +1,56 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty14.ts ===
+class C {
+>C : C
+
+    [Symbol.iterator]: { x; y };
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : any
+>y : any
+}
+interface I {
+>I : I
+
+    [Symbol.iterator]?: { x };
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : any
+}
+
+declare function foo(i: I): I;
+>foo : { (i: I): I; (a: any): any; }
+>i : I
+>I : I
+>I : I
+
+declare function foo(a: any): any;
+>foo : { (i: I): I; (a: any): any; }
+>a : any
+
+declare function bar(i: C): C;
+>bar : { (i: C): C; (a: any): any; }
+>i : C
+>C : C
+>C : C
+
+declare function bar(a: any): any;
+>bar : { (i: C): C; (a: any): any; }
+>a : any
+
+foo(new C);
+>foo(new C) : I
+>foo : { (i: I): I; (a: any): any; }
+>new C : C
+>C : typeof C
+
+var i: I;
+>i : I
+>I : I
+
+bar(i);
+>bar(i) : any
+>bar : { (i: C): C; (a: any): any; }
+>i : I
+
diff --git a/tests/baselines/reference/symbolProperty15.js b/tests/baselines/reference/symbolProperty15.js
new file mode 100644
index 0000000000000..0c1980370937a
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty15.js
@@ -0,0 +1,25 @@
+//// [symbolProperty15.ts]
+class C { }
+interface I {
+    [Symbol.iterator]?: { x };
+}
+
+declare function foo(i: I): I;
+declare function foo(a: any): any;
+
+declare function bar(i: C): C;
+declare function bar(a: any): any;
+
+foo(new C);
+var i: I;
+bar(i);
+
+//// [symbolProperty15.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
+foo(new C);
+var i;
+bar(i);
diff --git a/tests/baselines/reference/symbolProperty15.types b/tests/baselines/reference/symbolProperty15.types
new file mode 100644
index 0000000000000..b2baa3fcceeb7
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty15.types
@@ -0,0 +1,49 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty15.ts ===
+class C { }
+>C : C
+
+interface I {
+>I : I
+
+    [Symbol.iterator]?: { x };
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : any
+}
+
+declare function foo(i: I): I;
+>foo : { (i: I): I; (a: any): any; }
+>i : I
+>I : I
+>I : I
+
+declare function foo(a: any): any;
+>foo : { (i: I): I; (a: any): any; }
+>a : any
+
+declare function bar(i: C): C;
+>bar : { (i: C): C; (a: any): any; }
+>i : C
+>C : C
+>C : C
+
+declare function bar(a: any): any;
+>bar : { (i: C): C; (a: any): any; }
+>a : any
+
+foo(new C);
+>foo(new C) : any
+>foo : { (i: I): I; (a: any): any; }
+>new C : C
+>C : typeof C
+
+var i: I;
+>i : I
+>I : I
+
+bar(i);
+>bar(i) : C
+>bar : { (i: C): C; (a: any): any; }
+>i : I
+
diff --git a/tests/baselines/reference/symbolProperty16.js b/tests/baselines/reference/symbolProperty16.js
new file mode 100644
index 0000000000000..1a1f3f857af97
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty16.js
@@ -0,0 +1,27 @@
+//// [symbolProperty16.ts]
+class C {
+    private [Symbol.iterator]: { x };
+}
+interface I {
+    [Symbol.iterator]: { x };
+}
+
+declare function foo(i: I): I;
+declare function foo(a: any): any;
+
+declare function bar(i: C): C;
+declare function bar(a: any): any;
+
+foo(new C);
+var i: I;
+bar(i);
+
+//// [symbolProperty16.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
+foo(new C);
+var i;
+bar(i);
diff --git a/tests/baselines/reference/symbolProperty16.types b/tests/baselines/reference/symbolProperty16.types
new file mode 100644
index 0000000000000..041770aea0438
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty16.types
@@ -0,0 +1,55 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty16.ts ===
+class C {
+>C : C
+
+    private [Symbol.iterator]: { x };
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : any
+}
+interface I {
+>I : I
+
+    [Symbol.iterator]: { x };
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : any
+}
+
+declare function foo(i: I): I;
+>foo : { (i: I): I; (a: any): any; }
+>i : I
+>I : I
+>I : I
+
+declare function foo(a: any): any;
+>foo : { (i: I): I; (a: any): any; }
+>a : any
+
+declare function bar(i: C): C;
+>bar : { (i: C): C; (a: any): any; }
+>i : C
+>C : C
+>C : C
+
+declare function bar(a: any): any;
+>bar : { (i: C): C; (a: any): any; }
+>a : any
+
+foo(new C);
+>foo(new C) : any
+>foo : { (i: I): I; (a: any): any; }
+>new C : C
+>C : typeof C
+
+var i: I;
+>i : I
+>I : I
+
+bar(i);
+>bar(i) : any
+>bar : { (i: C): C; (a: any): any; }
+>i : I
+
diff --git a/tests/baselines/reference/symbolProperty17.errors.txt b/tests/baselines/reference/symbolProperty17.errors.txt
new file mode 100644
index 0000000000000..51f77646f0db7
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty17.errors.txt
@@ -0,0 +1,14 @@
+tests/cases/conformance/es6/Symbols/symbolProperty17.ts(3,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty17.ts (1 errors) ====
+    interface I {
+        [Symbol.iterator]: number;
+        [s: symbol]: string;
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+        "__@iterator": string;
+    }
+    
+    var i: I;
+    var it = i[Symbol.iterator];
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty17.js b/tests/baselines/reference/symbolProperty17.js
new file mode 100644
index 0000000000000..549577c8d6c26
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty17.js
@@ -0,0 +1,13 @@
+//// [symbolProperty17.ts]
+interface I {
+    [Symbol.iterator]: number;
+    [s: symbol]: string;
+    "__@iterator": string;
+}
+
+var i: I;
+var it = i[Symbol.iterator];
+
+//// [symbolProperty17.js]
+var i;
+var it = i[Symbol.iterator];
diff --git a/tests/baselines/reference/symbolProperty18.js b/tests/baselines/reference/symbolProperty18.js
new file mode 100644
index 0000000000000..17570e2f007a6
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty18.js
@@ -0,0 +1,22 @@
+//// [symbolProperty18.ts]
+var i = {
+    [Symbol.iterator]: 0,
+    [Symbol.toStringTag]() { return "" },
+    set [Symbol.toPrimitive](p: boolean) { }
+}
+
+var it = i[Symbol.iterator];
+var str = i[Symbol.toStringTag]();
+i[Symbol.toPrimitive] = false;
+
+//// [symbolProperty18.js]
+var i = {
+    [Symbol.iterator]: 0,
+    [Symbol.toStringTag]() {
+        return "";
+    },
+    set [Symbol.toPrimitive](p) { }
+};
+var it = i[Symbol.iterator];
+var str = i[Symbol.toStringTag]();
+i[Symbol.toPrimitive] = false;
diff --git a/tests/baselines/reference/symbolProperty18.types b/tests/baselines/reference/symbolProperty18.types
new file mode 100644
index 0000000000000..8dd74112a8d4e
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty18.types
@@ -0,0 +1,47 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty18.ts ===
+var i = {
+>i : { [Symbol.iterator]: number; [Symbol.toStringTag](): string; [Symbol.toPrimitive]: boolean; }
+>{    [Symbol.iterator]: 0,    [Symbol.toStringTag]() { return "" },    set [Symbol.toPrimitive](p: boolean) { }} : { [Symbol.iterator]: number; [Symbol.toStringTag](): string; [Symbol.toPrimitive]: boolean; }
+
+    [Symbol.iterator]: 0,
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+    [Symbol.toStringTag]() { return "" },
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+
+    set [Symbol.toPrimitive](p: boolean) { }
+>Symbol.toPrimitive : symbol
+>Symbol : SymbolConstructor
+>toPrimitive : symbol
+>p : boolean
+}
+
+var it = i[Symbol.iterator];
+>it : number
+>i[Symbol.iterator] : number
+>i : { [Symbol.iterator]: number; [Symbol.toStringTag](): string; [Symbol.toPrimitive]: boolean; }
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+var str = i[Symbol.toStringTag]();
+>str : string
+>i[Symbol.toStringTag]() : string
+>i[Symbol.toStringTag] : () => string
+>i : { [Symbol.iterator]: number; [Symbol.toStringTag](): string; [Symbol.toPrimitive]: boolean; }
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+
+i[Symbol.toPrimitive] = false;
+>i[Symbol.toPrimitive] = false : boolean
+>i[Symbol.toPrimitive] : boolean
+>i : { [Symbol.iterator]: number; [Symbol.toStringTag](): string; [Symbol.toPrimitive]: boolean; }
+>Symbol.toPrimitive : symbol
+>Symbol : SymbolConstructor
+>toPrimitive : symbol
+
diff --git a/tests/baselines/reference/symbolProperty19.js b/tests/baselines/reference/symbolProperty19.js
new file mode 100644
index 0000000000000..c64541691ccda
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty19.js
@@ -0,0 +1,18 @@
+//// [symbolProperty19.ts]
+var i = {
+    [Symbol.iterator]: { p: null },
+    [Symbol.toStringTag]() { return { p: undefined }; }
+}
+
+var it = i[Symbol.iterator];
+var str = i[Symbol.toStringTag]();
+
+//// [symbolProperty19.js]
+var i = {
+    [Symbol.iterator]: { p: null },
+    [Symbol.toStringTag]() {
+        return { p: undefined };
+    }
+};
+var it = i[Symbol.iterator];
+var str = i[Symbol.toStringTag]();
diff --git a/tests/baselines/reference/symbolProperty19.types b/tests/baselines/reference/symbolProperty19.types
new file mode 100644
index 0000000000000..705c2b8bdf7ab
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty19.types
@@ -0,0 +1,38 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty19.ts ===
+var i = {
+>i : { [Symbol.iterator]: { p: any; }; [Symbol.toStringTag](): { p: any; }; }
+>{    [Symbol.iterator]: { p: null },    [Symbol.toStringTag]() { return { p: undefined }; }} : { [Symbol.iterator]: { p: null; }; [Symbol.toStringTag](): { p: any; }; }
+
+    [Symbol.iterator]: { p: null },
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>{ p: null } : { p: null; }
+>p : null
+
+    [Symbol.toStringTag]() { return { p: undefined }; }
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+>{ p: undefined } : { p: undefined; }
+>p : undefined
+>undefined : undefined
+}
+
+var it = i[Symbol.iterator];
+>it : { p: any; }
+>i[Symbol.iterator] : { p: any; }
+>i : { [Symbol.iterator]: { p: any; }; [Symbol.toStringTag](): { p: any; }; }
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+var str = i[Symbol.toStringTag]();
+>str : { p: any; }
+>i[Symbol.toStringTag]() : { p: any; }
+>i[Symbol.toStringTag] : () => { p: any; }
+>i : { [Symbol.iterator]: { p: any; }; [Symbol.toStringTag](): { p: any; }; }
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+
diff --git a/tests/baselines/reference/symbolProperty2.js b/tests/baselines/reference/symbolProperty2.js
new file mode 100644
index 0000000000000..0158366f9d51f
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty2.js
@@ -0,0 +1,19 @@
+//// [symbolProperty2.ts]
+var s = Symbol();
+var x = {
+    [s]: 0,
+    [s]() { },
+    get [s]() {
+        return 0;
+    }
+}
+
+//// [symbolProperty2.js]
+var s = Symbol();
+var x = {
+    [s]: 0,
+    [s]() { },
+    get [s]() {
+        return 0;
+    }
+};
diff --git a/tests/baselines/reference/symbolProperty2.types b/tests/baselines/reference/symbolProperty2.types
new file mode 100644
index 0000000000000..37fe9d13bdbb7
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty2.types
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty2.ts ===
+var s = Symbol();
+>s : symbol
+>Symbol() : symbol
+>Symbol : SymbolConstructor
+
+var x = {
+>x : {}
+>{    [s]: 0,    [s]() { },    get [s]() {        return 0;    }} : {}
+
+    [s]: 0,
+>s : symbol
+
+    [s]() { },
+>s : symbol
+
+    get [s]() {
+>s : symbol
+
+        return 0;
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty20.js b/tests/baselines/reference/symbolProperty20.js
new file mode 100644
index 0000000000000..558305a577dca
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty20.js
@@ -0,0 +1,18 @@
+//// [symbolProperty20.ts]
+interface I {
+    [Symbol.iterator]: (s: string) => string;
+    [Symbol.toStringTag](s: number): number;
+}
+
+var i: I = {
+    [Symbol.iterator]: s => s,
+    [Symbol.toStringTag](n) { return n; }
+}
+
+//// [symbolProperty20.js]
+var i = {
+    [Symbol.iterator]: s => { return s; },
+    [Symbol.toStringTag](n) {
+        return n;
+    }
+};
diff --git a/tests/baselines/reference/symbolProperty20.types b/tests/baselines/reference/symbolProperty20.types
new file mode 100644
index 0000000000000..745401142d835
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty20.types
@@ -0,0 +1,37 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty20.ts ===
+interface I {
+>I : I
+
+    [Symbol.iterator]: (s: string) => string;
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>s : string
+
+    [Symbol.toStringTag](s: number): number;
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+>s : number
+}
+
+var i: I = {
+>i : I
+>I : I
+>{    [Symbol.iterator]: s => s,    [Symbol.toStringTag](n) { return n; }} : { [Symbol.iterator]: (s: string) => string; [Symbol.toStringTag](n: number): number; }
+
+    [Symbol.iterator]: s => s,
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>s => s : (s: string) => string
+>s : string
+>s : string
+
+    [Symbol.toStringTag](n) { return n; }
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+>n : number
+>n : number
+}
diff --git a/tests/baselines/reference/symbolProperty21.js b/tests/baselines/reference/symbolProperty21.js
new file mode 100644
index 0000000000000..13eaf06a97b5b
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty21.js
@@ -0,0 +1,20 @@
+//// [symbolProperty21.ts]
+interface I<T, U> {
+    [Symbol.unscopables]: T;
+    [Symbol.isConcatSpreadable]: U;
+}
+
+declare function foo<T, U>(p: I<T, U>): { t: T; u: U };
+
+foo({
+    [Symbol.isConcatSpreadable]: "",
+    [Symbol.isRegExp]: 0,
+    [Symbol.unscopables]: true
+});
+
+//// [symbolProperty21.js]
+foo({
+    [Symbol.isConcatSpreadable]: "",
+    [Symbol.isRegExp]: 0,
+    [Symbol.unscopables]: true
+});
diff --git a/tests/baselines/reference/symbolProperty21.types b/tests/baselines/reference/symbolProperty21.types
new file mode 100644
index 0000000000000..053dae46479c5
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty21.types
@@ -0,0 +1,53 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty21.ts ===
+interface I<T, U> {
+>I : I<T, U>
+>T : T
+>U : U
+
+    [Symbol.unscopables]: T;
+>Symbol.unscopables : symbol
+>Symbol : SymbolConstructor
+>unscopables : symbol
+>T : T
+
+    [Symbol.isConcatSpreadable]: U;
+>Symbol.isConcatSpreadable : symbol
+>Symbol : SymbolConstructor
+>isConcatSpreadable : symbol
+>U : U
+}
+
+declare function foo<T, U>(p: I<T, U>): { t: T; u: U };
+>foo : <T, U>(p: I<T, U>) => { t: T; u: U; }
+>T : T
+>U : U
+>p : I<T, U>
+>I : I<T, U>
+>T : T
+>U : U
+>t : T
+>T : T
+>u : U
+>U : U
+
+foo({
+>foo({    [Symbol.isConcatSpreadable]: "",    [Symbol.isRegExp]: 0,    [Symbol.unscopables]: true}) : { t: boolean; u: string; }
+>foo : <T, U>(p: I<T, U>) => { t: T; u: U; }
+>{    [Symbol.isConcatSpreadable]: "",    [Symbol.isRegExp]: 0,    [Symbol.unscopables]: true} : { [Symbol.isConcatSpreadable]: string; [Symbol.isRegExp]: number; [Symbol.unscopables]: boolean; }
+
+    [Symbol.isConcatSpreadable]: "",
+>Symbol.isConcatSpreadable : symbol
+>Symbol : SymbolConstructor
+>isConcatSpreadable : symbol
+
+    [Symbol.isRegExp]: 0,
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+
+    [Symbol.unscopables]: true
+>Symbol.unscopables : symbol
+>Symbol : SymbolConstructor
+>unscopables : symbol
+
+});
diff --git a/tests/baselines/reference/symbolProperty22.js b/tests/baselines/reference/symbolProperty22.js
new file mode 100644
index 0000000000000..35757182143b1
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty22.js
@@ -0,0 +1,11 @@
+//// [symbolProperty22.ts]
+interface I<T, U> {
+    [Symbol.unscopables](x: T): U;
+}
+
+declare function foo<T, U>(p1: T, p2: I<T, U>): U;
+
+foo("", { [Symbol.unscopables]: s => s.length });
+
+//// [symbolProperty22.js]
+foo("", { [Symbol.unscopables]: s => { return s.length; } });
diff --git a/tests/baselines/reference/symbolProperty22.types b/tests/baselines/reference/symbolProperty22.types
new file mode 100644
index 0000000000000..64fb5fc234c81
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty22.types
@@ -0,0 +1,40 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty22.ts ===
+interface I<T, U> {
+>I : I<T, U>
+>T : T
+>U : U
+
+    [Symbol.unscopables](x: T): U;
+>Symbol.unscopables : symbol
+>Symbol : SymbolConstructor
+>unscopables : symbol
+>x : T
+>T : T
+>U : U
+}
+
+declare function foo<T, U>(p1: T, p2: I<T, U>): U;
+>foo : <T, U>(p1: T, p2: I<T, U>) => U
+>T : T
+>U : U
+>p1 : T
+>T : T
+>p2 : I<T, U>
+>I : I<T, U>
+>T : T
+>U : U
+>U : U
+
+foo("", { [Symbol.unscopables]: s => s.length });
+>foo("", { [Symbol.unscopables]: s => s.length }) : number
+>foo : <T, U>(p1: T, p2: I<T, U>) => U
+>{ [Symbol.unscopables]: s => s.length } : { [Symbol.unscopables]: (s: string) => number; }
+>Symbol.unscopables : symbol
+>Symbol : SymbolConstructor
+>unscopables : symbol
+>s => s.length : (s: string) => number
+>s : string
+>s.length : number
+>s : string
+>length : number
+
diff --git a/tests/baselines/reference/symbolProperty23.js b/tests/baselines/reference/symbolProperty23.js
new file mode 100644
index 0000000000000..b3291ad34e8bc
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty23.js
@@ -0,0 +1,20 @@
+//// [symbolProperty23.ts]
+interface I {
+    [Symbol.toPrimitive]: () => boolean;
+}
+
+class C implements I {
+    [Symbol.toPrimitive]() {
+        return true;
+    }
+}
+
+//// [symbolProperty23.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.toPrimitive] = function () {
+        return true;
+    };
+    return C;
+})();
diff --git a/tests/baselines/reference/symbolProperty23.types b/tests/baselines/reference/symbolProperty23.types
new file mode 100644
index 0000000000000..b28ecb2dbe435
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty23.types
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty23.ts ===
+interface I {
+>I : I
+
+    [Symbol.toPrimitive]: () => boolean;
+>Symbol.toPrimitive : symbol
+>Symbol : SymbolConstructor
+>toPrimitive : symbol
+}
+
+class C implements I {
+>C : C
+>I : I
+
+    [Symbol.toPrimitive]() {
+>Symbol.toPrimitive : symbol
+>Symbol : SymbolConstructor
+>toPrimitive : symbol
+
+        return true;
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty24.errors.txt b/tests/baselines/reference/symbolProperty24.errors.txt
new file mode 100644
index 0000000000000..25cba184e2567
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty24.errors.txt
@@ -0,0 +1,21 @@
+tests/cases/conformance/es6/Symbols/symbolProperty24.ts(5,7): error TS2420: Class 'C' incorrectly implements interface 'I'.
+  Types of property '[Symbol.toPrimitive]' are incompatible.
+    Type '() => string' is not assignable to type '() => boolean'.
+      Type 'string' is not assignable to type 'boolean'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty24.ts (1 errors) ====
+    interface I {
+        [Symbol.toPrimitive]: () => boolean;
+    }
+    
+    class C implements I {
+          ~
+!!! error TS2420: Class 'C' incorrectly implements interface 'I'.
+!!! error TS2420:   Types of property '[Symbol.toPrimitive]' are incompatible.
+!!! error TS2420:     Type '() => string' is not assignable to type '() => boolean'.
+!!! error TS2420:       Type 'string' is not assignable to type 'boolean'.
+        [Symbol.toPrimitive]() {
+            return "";
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty24.js b/tests/baselines/reference/symbolProperty24.js
new file mode 100644
index 0000000000000..b5d059dd29f1a
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty24.js
@@ -0,0 +1,20 @@
+//// [symbolProperty24.ts]
+interface I {
+    [Symbol.toPrimitive]: () => boolean;
+}
+
+class C implements I {
+    [Symbol.toPrimitive]() {
+        return "";
+    }
+}
+
+//// [symbolProperty24.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.toPrimitive] = function () {
+        return "";
+    };
+    return C;
+})();
diff --git a/tests/baselines/reference/symbolProperty25.errors.txt b/tests/baselines/reference/symbolProperty25.errors.txt
new file mode 100644
index 0000000000000..a6cde31c1adcd
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty25.errors.txt
@@ -0,0 +1,17 @@
+tests/cases/conformance/es6/Symbols/symbolProperty25.ts(5,7): error TS2420: Class 'C' incorrectly implements interface 'I'.
+  Property '[Symbol.toPrimitive]' is missing in type 'C'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty25.ts (1 errors) ====
+    interface I {
+        [Symbol.toPrimitive]: () => boolean;
+    }
+    
+    class C implements I {
+          ~
+!!! error TS2420: Class 'C' incorrectly implements interface 'I'.
+!!! error TS2420:   Property '[Symbol.toPrimitive]' is missing in type 'C'.
+        [Symbol.toStringTag]() {
+            return "";
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty25.js b/tests/baselines/reference/symbolProperty25.js
new file mode 100644
index 0000000000000..c932da1e3ebea
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty25.js
@@ -0,0 +1,20 @@
+//// [symbolProperty25.ts]
+interface I {
+    [Symbol.toPrimitive]: () => boolean;
+}
+
+class C implements I {
+    [Symbol.toStringTag]() {
+        return "";
+    }
+}
+
+//// [symbolProperty25.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.toStringTag] = function () {
+        return "";
+    };
+    return C;
+})();
diff --git a/tests/baselines/reference/symbolProperty26.js b/tests/baselines/reference/symbolProperty26.js
new file mode 100644
index 0000000000000..9e98027603d43
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty26.js
@@ -0,0 +1,38 @@
+//// [symbolProperty26.ts]
+class C1 {
+    [Symbol.toStringTag]() {
+        return "";
+    }
+}
+
+class C2 extends C1 {
+    [Symbol.toStringTag]() {
+        return "";
+    }
+}
+
+//// [symbolProperty26.js]
+var __extends = this.__extends || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    __.prototype = b.prototype;
+    d.prototype = new __();
+};
+var C1 = (function () {
+    function C1() {
+    }
+    C1.prototype[Symbol.toStringTag] = function () {
+        return "";
+    };
+    return C1;
+})();
+var C2 = (function (_super) {
+    __extends(C2, _super);
+    function C2() {
+        _super.apply(this, arguments);
+    }
+    C2.prototype[Symbol.toStringTag] = function () {
+        return "";
+    };
+    return C2;
+})(C1);
diff --git a/tests/baselines/reference/symbolProperty26.types b/tests/baselines/reference/symbolProperty26.types
new file mode 100644
index 0000000000000..3971ccb402d94
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty26.types
@@ -0,0 +1,25 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty26.ts ===
+class C1 {
+>C1 : C1
+
+    [Symbol.toStringTag]() {
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+
+        return "";
+    }
+}
+
+class C2 extends C1 {
+>C2 : C2
+>C1 : C1
+
+    [Symbol.toStringTag]() {
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+
+        return "";
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty27.js b/tests/baselines/reference/symbolProperty27.js
new file mode 100644
index 0000000000000..f19d05233cb28
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty27.js
@@ -0,0 +1,38 @@
+//// [symbolProperty27.ts]
+class C1 {
+    [Symbol.toStringTag]() {
+        return {};
+    }
+}
+
+class C2 extends C1 {
+    [Symbol.toStringTag]() {
+        return "";
+    }
+}
+
+//// [symbolProperty27.js]
+var __extends = this.__extends || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    __.prototype = b.prototype;
+    d.prototype = new __();
+};
+var C1 = (function () {
+    function C1() {
+    }
+    C1.prototype[Symbol.toStringTag] = function () {
+        return {};
+    };
+    return C1;
+})();
+var C2 = (function (_super) {
+    __extends(C2, _super);
+    function C2() {
+        _super.apply(this, arguments);
+    }
+    C2.prototype[Symbol.toStringTag] = function () {
+        return "";
+    };
+    return C2;
+})(C1);
diff --git a/tests/baselines/reference/symbolProperty27.types b/tests/baselines/reference/symbolProperty27.types
new file mode 100644
index 0000000000000..5a5261a11b592
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty27.types
@@ -0,0 +1,26 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty27.ts ===
+class C1 {
+>C1 : C1
+
+    [Symbol.toStringTag]() {
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+
+        return {};
+>{} : {}
+    }
+}
+
+class C2 extends C1 {
+>C2 : C2
+>C1 : C1
+
+    [Symbol.toStringTag]() {
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+
+        return "";
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty28.js b/tests/baselines/reference/symbolProperty28.js
new file mode 100644
index 0000000000000..219a192e381cd
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty28.js
@@ -0,0 +1,36 @@
+//// [symbolProperty28.ts]
+class C1 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+}
+
+class C2 extends C1 { }
+
+var c: C2;
+var obj = c[Symbol.toStringTag]().x;
+
+//// [symbolProperty28.js]
+var __extends = this.__extends || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    __.prototype = b.prototype;
+    d.prototype = new __();
+};
+var C1 = (function () {
+    function C1() {
+    }
+    C1.prototype[Symbol.toStringTag] = function () {
+        return { x: "" };
+    };
+    return C1;
+})();
+var C2 = (function (_super) {
+    __extends(C2, _super);
+    function C2() {
+        _super.apply(this, arguments);
+    }
+    return C2;
+})(C1);
+var c;
+var obj = c[Symbol.toStringTag]().x;
diff --git a/tests/baselines/reference/symbolProperty28.types b/tests/baselines/reference/symbolProperty28.types
new file mode 100644
index 0000000000000..ef5aa0f30034a
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty28.types
@@ -0,0 +1,34 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty28.ts ===
+class C1 {
+>C1 : C1
+
+    [Symbol.toStringTag]() {
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+
+        return { x: "" };
+>{ x: "" } : { x: string; }
+>x : string
+    }
+}
+
+class C2 extends C1 { }
+>C2 : C2
+>C1 : C1
+
+var c: C2;
+>c : C2
+>C2 : C2
+
+var obj = c[Symbol.toStringTag]().x;
+>obj : string
+>c[Symbol.toStringTag]().x : string
+>c[Symbol.toStringTag]() : { x: string; }
+>c[Symbol.toStringTag] : () => { x: string; }
+>c : C2
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+>x : string
+
diff --git a/tests/baselines/reference/symbolProperty29.errors.txt b/tests/baselines/reference/symbolProperty29.errors.txt
new file mode 100644
index 0000000000000..1efaeb2b3bfb8
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty29.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/es6/Symbols/symbolProperty29.ts(5,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty29.ts (1 errors) ====
+    class C1 {
+        [Symbol.toStringTag]() {
+            return { x: "" };
+        }
+        [s: symbol]: () => { x: string };
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty29.js b/tests/baselines/reference/symbolProperty29.js
new file mode 100644
index 0000000000000..f7fee99f6a1f0
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty29.js
@@ -0,0 +1,17 @@
+//// [symbolProperty29.ts]
+class C1 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+    [s: symbol]: () => { x: string };
+}
+
+//// [symbolProperty29.js]
+var C1 = (function () {
+    function C1() {
+    }
+    C1.prototype[Symbol.toStringTag] = function () {
+        return { x: "" };
+    };
+    return C1;
+})();
diff --git a/tests/baselines/reference/symbolProperty3.errors.txt b/tests/baselines/reference/symbolProperty3.errors.txt
new file mode 100644
index 0000000000000..ed557c85a633c
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty3.errors.txt
@@ -0,0 +1,20 @@
+tests/cases/conformance/es6/Symbols/symbolProperty3.ts(3,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/Symbols/symbolProperty3.ts(4,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/Symbols/symbolProperty3.ts(5,9): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty3.ts (3 errors) ====
+    var s = Symbol;
+    var x = {
+        [s]: 0,
+        ~~~
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+        [s]() { },
+        ~~~
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+        get [s]() {
+            ~~~
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+            return 0;
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty3.js b/tests/baselines/reference/symbolProperty3.js
new file mode 100644
index 0000000000000..dda9ca23d3286
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty3.js
@@ -0,0 +1,19 @@
+//// [symbolProperty3.ts]
+var s = Symbol;
+var x = {
+    [s]: 0,
+    [s]() { },
+    get [s]() {
+        return 0;
+    }
+}
+
+//// [symbolProperty3.js]
+var s = Symbol;
+var x = {
+    [s]: 0,
+    [s]() { },
+    get [s]() {
+        return 0;
+    }
+};
diff --git a/tests/baselines/reference/symbolProperty30.errors.txt b/tests/baselines/reference/symbolProperty30.errors.txt
new file mode 100644
index 0000000000000..b839d11d1b803
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty30.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/es6/Symbols/symbolProperty30.ts(5,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty30.ts (1 errors) ====
+    class C1 {
+        [Symbol.toStringTag]() {
+            return { x: "" };
+        }
+        [s: symbol]: () => { x: number };
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty30.js b/tests/baselines/reference/symbolProperty30.js
new file mode 100644
index 0000000000000..bdb108015cff5
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty30.js
@@ -0,0 +1,17 @@
+//// [symbolProperty30.ts]
+class C1 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+    [s: symbol]: () => { x: number };
+}
+
+//// [symbolProperty30.js]
+var C1 = (function () {
+    function C1() {
+    }
+    C1.prototype[Symbol.toStringTag] = function () {
+        return { x: "" };
+    };
+    return C1;
+})();
diff --git a/tests/baselines/reference/symbolProperty31.errors.txt b/tests/baselines/reference/symbolProperty31.errors.txt
new file mode 100644
index 0000000000000..39735c017b2ad
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty31.errors.txt
@@ -0,0 +1,14 @@
+tests/cases/conformance/es6/Symbols/symbolProperty31.ts(7,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty31.ts (1 errors) ====
+    class C1 {
+        [Symbol.toStringTag]() {
+            return { x: "" };
+        }
+    }
+    class C2 extends C1 {
+        [s: symbol]: () => { x: string };
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty31.js b/tests/baselines/reference/symbolProperty31.js
new file mode 100644
index 0000000000000..cf53277465273
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty31.js
@@ -0,0 +1,32 @@
+//// [symbolProperty31.ts]
+class C1 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+}
+class C2 extends C1 {
+    [s: symbol]: () => { x: string };
+}
+
+//// [symbolProperty31.js]
+var __extends = this.__extends || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    __.prototype = b.prototype;
+    d.prototype = new __();
+};
+var C1 = (function () {
+    function C1() {
+    }
+    C1.prototype[Symbol.toStringTag] = function () {
+        return { x: "" };
+    };
+    return C1;
+})();
+var C2 = (function (_super) {
+    __extends(C2, _super);
+    function C2() {
+        _super.apply(this, arguments);
+    }
+    return C2;
+})(C1);
diff --git a/tests/baselines/reference/symbolProperty32.errors.txt b/tests/baselines/reference/symbolProperty32.errors.txt
new file mode 100644
index 0000000000000..4051f8f91c84b
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty32.errors.txt
@@ -0,0 +1,14 @@
+tests/cases/conformance/es6/Symbols/symbolProperty32.ts(7,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty32.ts (1 errors) ====
+    class C1 {
+        [Symbol.toStringTag]() {
+            return { x: "" };
+        }
+    }
+    class C2 extends C1 {
+        [s: symbol]: () => { x: number };
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty32.js b/tests/baselines/reference/symbolProperty32.js
new file mode 100644
index 0000000000000..73e4bffdc01f8
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty32.js
@@ -0,0 +1,32 @@
+//// [symbolProperty32.ts]
+class C1 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+}
+class C2 extends C1 {
+    [s: symbol]: () => { x: number };
+}
+
+//// [symbolProperty32.js]
+var __extends = this.__extends || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    __.prototype = b.prototype;
+    d.prototype = new __();
+};
+var C1 = (function () {
+    function C1() {
+    }
+    C1.prototype[Symbol.toStringTag] = function () {
+        return { x: "" };
+    };
+    return C1;
+})();
+var C2 = (function (_super) {
+    __extends(C2, _super);
+    function C2() {
+        _super.apply(this, arguments);
+    }
+    return C2;
+})(C1);
diff --git a/tests/baselines/reference/symbolProperty33.errors.txt b/tests/baselines/reference/symbolProperty33.errors.txt
new file mode 100644
index 0000000000000..25a16b045abe6
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty33.errors.txt
@@ -0,0 +1,14 @@
+tests/cases/conformance/es6/Symbols/symbolProperty33.ts(7,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty33.ts (1 errors) ====
+    class C1 extends C2 {
+        [Symbol.toStringTag]() {
+            return { x: "" };
+        }
+    }
+    class C2 {
+        [s: symbol]: () => { x: string };
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty33.js b/tests/baselines/reference/symbolProperty33.js
new file mode 100644
index 0000000000000..f5a0801033858
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty33.js
@@ -0,0 +1,32 @@
+//// [symbolProperty33.ts]
+class C1 extends C2 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+}
+class C2 {
+    [s: symbol]: () => { x: string };
+}
+
+//// [symbolProperty33.js]
+var __extends = this.__extends || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    __.prototype = b.prototype;
+    d.prototype = new __();
+};
+var C1 = (function (_super) {
+    __extends(C1, _super);
+    function C1() {
+        _super.apply(this, arguments);
+    }
+    C1.prototype[Symbol.toStringTag] = function () {
+        return { x: "" };
+    };
+    return C1;
+})(C2);
+var C2 = (function () {
+    function C2() {
+    }
+    return C2;
+})();
diff --git a/tests/baselines/reference/symbolProperty34.errors.txt b/tests/baselines/reference/symbolProperty34.errors.txt
new file mode 100644
index 0000000000000..4339af94788c3
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty34.errors.txt
@@ -0,0 +1,14 @@
+tests/cases/conformance/es6/Symbols/symbolProperty34.ts(7,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty34.ts (1 errors) ====
+    class C1 extends C2 {
+        [Symbol.toStringTag]() {
+            return { x: "" };
+        }
+    }
+    class C2 {
+        [s: symbol]: () => { x: number };
+         ~
+!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty34.js b/tests/baselines/reference/symbolProperty34.js
new file mode 100644
index 0000000000000..5b25f487fbf26
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty34.js
@@ -0,0 +1,32 @@
+//// [symbolProperty34.ts]
+class C1 extends C2 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+}
+class C2 {
+    [s: symbol]: () => { x: number };
+}
+
+//// [symbolProperty34.js]
+var __extends = this.__extends || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    __.prototype = b.prototype;
+    d.prototype = new __();
+};
+var C1 = (function (_super) {
+    __extends(C1, _super);
+    function C1() {
+        _super.apply(this, arguments);
+    }
+    C1.prototype[Symbol.toStringTag] = function () {
+        return { x: "" };
+    };
+    return C1;
+})(C2);
+var C2 = (function () {
+    function C2() {
+    }
+    return C2;
+})();
diff --git a/tests/baselines/reference/symbolProperty35.errors.txt b/tests/baselines/reference/symbolProperty35.errors.txt
new file mode 100644
index 0000000000000..1558f5a3409bc
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty35.errors.txt
@@ -0,0 +1,16 @@
+tests/cases/conformance/es6/Symbols/symbolProperty35.ts(8,11): error TS2320: Interface 'I3' cannot simultaneously extend types 'I1' and 'I2'.
+  Named property '[Symbol.toStringTag]' of types 'I1' and 'I2' are not identical.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty35.ts (1 errors) ====
+    interface I1 {
+        [Symbol.toStringTag](): { x: string }
+    }
+    interface I2 {
+        [Symbol.toStringTag](): { x: number }
+    }
+    
+    interface I3 extends I1, I2 { }
+              ~~
+!!! error TS2320: Interface 'I3' cannot simultaneously extend types 'I1' and 'I2'.
+!!! error TS2320:   Named property '[Symbol.toStringTag]' of types 'I1' and 'I2' are not identical.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty35.js b/tests/baselines/reference/symbolProperty35.js
new file mode 100644
index 0000000000000..c96e4ce28b17e
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty35.js
@@ -0,0 +1,11 @@
+//// [symbolProperty35.ts]
+interface I1 {
+    [Symbol.toStringTag](): { x: string }
+}
+interface I2 {
+    [Symbol.toStringTag](): { x: number }
+}
+
+interface I3 extends I1, I2 { }
+
+//// [symbolProperty35.js]
diff --git a/tests/baselines/reference/symbolProperty36.errors.txt b/tests/baselines/reference/symbolProperty36.errors.txt
new file mode 100644
index 0000000000000..6fe3299ab905e
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty36.errors.txt
@@ -0,0 +1,13 @@
+tests/cases/conformance/es6/Symbols/symbolProperty36.ts(2,5): error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+tests/cases/conformance/es6/Symbols/symbolProperty36.ts(3,5): error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty36.ts (2 errors) ====
+    var x = {
+        [Symbol.isConcatSpreadable]: 0,
+        ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+        [Symbol.isConcatSpreadable]: 1
+        ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty36.js b/tests/baselines/reference/symbolProperty36.js
new file mode 100644
index 0000000000000..35d29d4892d51
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty36.js
@@ -0,0 +1,11 @@
+//// [symbolProperty36.ts]
+var x = {
+    [Symbol.isConcatSpreadable]: 0,
+    [Symbol.isConcatSpreadable]: 1
+}
+
+//// [symbolProperty36.js]
+var x = {
+    [Symbol.isConcatSpreadable]: 0,
+    [Symbol.isConcatSpreadable]: 1
+};
diff --git a/tests/baselines/reference/symbolProperty37.errors.txt b/tests/baselines/reference/symbolProperty37.errors.txt
new file mode 100644
index 0000000000000..96e10e7f2a4e2
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty37.errors.txt
@@ -0,0 +1,13 @@
+tests/cases/conformance/es6/Symbols/symbolProperty37.ts(2,5): error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+tests/cases/conformance/es6/Symbols/symbolProperty37.ts(3,5): error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty37.ts (2 errors) ====
+    interface I {
+        [Symbol.isConcatSpreadable]: string;
+        ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+        [Symbol.isConcatSpreadable]: string;
+        ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty37.js b/tests/baselines/reference/symbolProperty37.js
new file mode 100644
index 0000000000000..2aaf97ef3008d
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty37.js
@@ -0,0 +1,7 @@
+//// [symbolProperty37.ts]
+interface I {
+    [Symbol.isConcatSpreadable]: string;
+    [Symbol.isConcatSpreadable]: string;
+}
+
+//// [symbolProperty37.js]
diff --git a/tests/baselines/reference/symbolProperty38.errors.txt b/tests/baselines/reference/symbolProperty38.errors.txt
new file mode 100644
index 0000000000000..a519f7eb9a3d5
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty38.errors.txt
@@ -0,0 +1,15 @@
+tests/cases/conformance/es6/Symbols/symbolProperty38.ts(2,5): error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+tests/cases/conformance/es6/Symbols/symbolProperty38.ts(5,5): error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty38.ts (2 errors) ====
+    interface I {
+        [Symbol.isConcatSpreadable]: string;
+        ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+    }
+    interface I {
+        [Symbol.isConcatSpreadable]: string;
+        ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2300: Duplicate identifier '[Symbol.isConcatSpreadable]'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty38.js b/tests/baselines/reference/symbolProperty38.js
new file mode 100644
index 0000000000000..b90b4d8081d38
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty38.js
@@ -0,0 +1,9 @@
+//// [symbolProperty38.ts]
+interface I {
+    [Symbol.isConcatSpreadable]: string;
+}
+interface I {
+    [Symbol.isConcatSpreadable]: string;
+}
+
+//// [symbolProperty38.js]
diff --git a/tests/baselines/reference/symbolProperty39.errors.txt b/tests/baselines/reference/symbolProperty39.errors.txt
new file mode 100644
index 0000000000000..62dbdfc591c9a
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty39.errors.txt
@@ -0,0 +1,25 @@
+tests/cases/conformance/es6/Symbols/symbolProperty39.ts(2,5): error TS2393: Duplicate function implementation.
+tests/cases/conformance/es6/Symbols/symbolProperty39.ts(3,5): error TS2393: Duplicate function implementation.
+tests/cases/conformance/es6/Symbols/symbolProperty39.ts(4,5): error TS2393: Duplicate function implementation.
+tests/cases/conformance/es6/Symbols/symbolProperty39.ts(7,5): error TS2393: Duplicate function implementation.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty39.ts (4 errors) ====
+    class C {
+        [Symbol.iterator](x: string): string;
+        ~~~~~~~~~~~~~~~~~
+!!! error TS2393: Duplicate function implementation.
+        [Symbol.iterator](x: number): number;
+        ~~~~~~~~~~~~~~~~~
+!!! error TS2393: Duplicate function implementation.
+        [Symbol.iterator](x: any) {
+        ~~~~~~~~~~~~~~~~~
+!!! error TS2393: Duplicate function implementation.
+            return undefined;
+        }
+        [Symbol.iterator](x: any) {
+        ~~~~~~~~~~~~~~~~~
+!!! error TS2393: Duplicate function implementation.
+            return undefined;
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty39.js b/tests/baselines/reference/symbolProperty39.js
new file mode 100644
index 0000000000000..18551d20c0b33
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty39.js
@@ -0,0 +1,24 @@
+//// [symbolProperty39.ts]
+class C {
+    [Symbol.iterator](x: string): string;
+    [Symbol.iterator](x: number): number;
+    [Symbol.iterator](x: any) {
+        return undefined;
+    }
+    [Symbol.iterator](x: any) {
+        return undefined;
+    }
+}
+
+//// [symbolProperty39.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.iterator] = function (x) {
+        return undefined;
+    };
+    C.prototype[Symbol.iterator] = function (x) {
+        return undefined;
+    };
+    return C;
+})();
diff --git a/tests/baselines/reference/symbolProperty4.js b/tests/baselines/reference/symbolProperty4.js
new file mode 100644
index 0000000000000..6072d6bbf725e
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty4.js
@@ -0,0 +1,17 @@
+//// [symbolProperty4.ts]
+var x = {
+    [Symbol()]: 0,
+    [Symbol()]() { },
+    get [Symbol()]() {
+        return 0;
+    }
+}
+
+//// [symbolProperty4.js]
+var x = {
+    [Symbol()]: 0,
+    [Symbol()]() { },
+    get [Symbol()]() {
+        return 0;
+    }
+};
diff --git a/tests/baselines/reference/symbolProperty4.types b/tests/baselines/reference/symbolProperty4.types
new file mode 100644
index 0000000000000..b8aac1f2770fe
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty4.types
@@ -0,0 +1,20 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty4.ts ===
+var x = {
+>x : {}
+>{    [Symbol()]: 0,    [Symbol()]() { },    get [Symbol()]() {        return 0;    }} : {}
+
+    [Symbol()]: 0,
+>Symbol() : symbol
+>Symbol : SymbolConstructor
+
+    [Symbol()]() { },
+>Symbol() : symbol
+>Symbol : SymbolConstructor
+
+    get [Symbol()]() {
+>Symbol() : symbol
+>Symbol : SymbolConstructor
+
+        return 0;
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty40.js b/tests/baselines/reference/symbolProperty40.js
new file mode 100644
index 0000000000000..15d8c5c6fba81
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty40.js
@@ -0,0 +1,26 @@
+//// [symbolProperty40.ts]
+class C {
+    [Symbol.iterator](x: string): string;
+    [Symbol.iterator](x: number): number;
+    [Symbol.iterator](x: any) {
+        return undefined;
+    }
+}
+
+var c = new C;
+c[Symbol.iterator]("");
+c[Symbol.iterator](0);
+
+
+//// [symbolProperty40.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.iterator] = function (x) {
+        return undefined;
+    };
+    return C;
+})();
+var c = new C;
+c[Symbol.iterator]("");
+c[Symbol.iterator](0);
diff --git a/tests/baselines/reference/symbolProperty40.types b/tests/baselines/reference/symbolProperty40.types
new file mode 100644
index 0000000000000..a87a6ea28a806
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty40.types
@@ -0,0 +1,48 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty40.ts ===
+class C {
+>C : C
+
+    [Symbol.iterator](x: string): string;
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : string
+
+    [Symbol.iterator](x: number): number;
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : number
+
+    [Symbol.iterator](x: any) {
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : any
+
+        return undefined;
+>undefined : undefined
+    }
+}
+
+var c = new C;
+>c : C
+>new C : C
+>C : typeof C
+
+c[Symbol.iterator]("");
+>c[Symbol.iterator]("") : string
+>c[Symbol.iterator] : { (x: string): string; (x: number): number; }
+>c : C
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+c[Symbol.iterator](0);
+>c[Symbol.iterator](0) : number
+>c[Symbol.iterator] : { (x: string): string; (x: number): number; }
+>c : C
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
diff --git a/tests/baselines/reference/symbolProperty41.js b/tests/baselines/reference/symbolProperty41.js
new file mode 100644
index 0000000000000..d26b2c7682aee
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty41.js
@@ -0,0 +1,26 @@
+//// [symbolProperty41.ts]
+class C {
+    [Symbol.iterator](x: string): { x: string };
+    [Symbol.iterator](x: "hello"): { x: string; hello: string };
+    [Symbol.iterator](x: any) {
+        return undefined;
+    }
+}
+
+var c = new C;
+c[Symbol.iterator]("");
+c[Symbol.iterator]("hello");
+
+
+//// [symbolProperty41.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.iterator] = function (x) {
+        return undefined;
+    };
+    return C;
+})();
+var c = new C;
+c[Symbol.iterator]("");
+c[Symbol.iterator]("hello");
diff --git a/tests/baselines/reference/symbolProperty41.types b/tests/baselines/reference/symbolProperty41.types
new file mode 100644
index 0000000000000..94032c194d683
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty41.types
@@ -0,0 +1,51 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty41.ts ===
+class C {
+>C : C
+
+    [Symbol.iterator](x: string): { x: string };
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : string
+>x : string
+
+    [Symbol.iterator](x: "hello"): { x: string; hello: string };
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : "hello"
+>x : string
+>hello : string
+
+    [Symbol.iterator](x: any) {
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+>x : any
+
+        return undefined;
+>undefined : undefined
+    }
+}
+
+var c = new C;
+>c : C
+>new C : C
+>C : typeof C
+
+c[Symbol.iterator]("");
+>c[Symbol.iterator]("") : { x: string; }
+>c[Symbol.iterator] : { (x: string): { x: string; }; (x: "hello"): { x: string; hello: string; }; }
+>c : C
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+c[Symbol.iterator]("hello");
+>c[Symbol.iterator]("hello") : { x: string; hello: string; }
+>c[Symbol.iterator] : { (x: string): { x: string; }; (x: "hello"): { x: string; hello: string; }; }
+>c : C
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
diff --git a/tests/baselines/reference/symbolProperty42.errors.txt b/tests/baselines/reference/symbolProperty42.errors.txt
new file mode 100644
index 0000000000000..291c1c1cc5083
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty42.errors.txt
@@ -0,0 +1,16 @@
+tests/cases/conformance/es6/Symbols/symbolProperty42.ts(3,12): error TS2388: Function overload must not be static.
+tests/cases/conformance/es6/Symbols/symbolProperty42.ts(4,5): error TS2387: Function overload must be static.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty42.ts (2 errors) ====
+    class C {
+        [Symbol.iterator](x: string): string;
+        static [Symbol.iterator](x: number): number;
+               ~~~~~~~~~~~~~~~~~
+!!! error TS2388: Function overload must not be static.
+        [Symbol.iterator](x: any) {
+        ~~~~~~~~~~~~~~~~~
+!!! error TS2387: Function overload must be static.
+            return undefined;
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty42.js b/tests/baselines/reference/symbolProperty42.js
new file mode 100644
index 0000000000000..1990f54066c6c
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty42.js
@@ -0,0 +1,18 @@
+//// [symbolProperty42.ts]
+class C {
+    [Symbol.iterator](x: string): string;
+    static [Symbol.iterator](x: number): number;
+    [Symbol.iterator](x: any) {
+        return undefined;
+    }
+}
+
+//// [symbolProperty42.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype[Symbol.iterator] = function (x) {
+        return undefined;
+    };
+    return C;
+})();
diff --git a/tests/baselines/reference/symbolProperty43.errors.txt b/tests/baselines/reference/symbolProperty43.errors.txt
new file mode 100644
index 0000000000000..c5124c4cd2265
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty43.errors.txt
@@ -0,0 +1,10 @@
+tests/cases/conformance/es6/Symbols/symbolProperty43.ts(3,5): error TS2391: Function implementation is missing or not immediately following the declaration.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty43.ts (1 errors) ====
+    class C {
+        [Symbol.iterator](x: string): string;
+        [Symbol.iterator](x: number): number;
+        ~~~~~~~~~~~~~~~~~
+!!! error TS2391: Function implementation is missing or not immediately following the declaration.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty43.js b/tests/baselines/reference/symbolProperty43.js
new file mode 100644
index 0000000000000..fcb1fd3f8e511
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty43.js
@@ -0,0 +1,12 @@
+//// [symbolProperty43.ts]
+class C {
+    [Symbol.iterator](x: string): string;
+    [Symbol.iterator](x: number): number;
+}
+
+//// [symbolProperty43.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
diff --git a/tests/baselines/reference/symbolProperty44.errors.txt b/tests/baselines/reference/symbolProperty44.errors.txt
new file mode 100644
index 0000000000000..2cef480e73664
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty44.errors.txt
@@ -0,0 +1,17 @@
+tests/cases/conformance/es6/Symbols/symbolProperty44.ts(2,9): error TS2300: Duplicate identifier '[Symbol.hasInstance]'.
+tests/cases/conformance/es6/Symbols/symbolProperty44.ts(5,9): error TS2300: Duplicate identifier '[Symbol.hasInstance]'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty44.ts (2 errors) ====
+    class C {
+        get [Symbol.hasInstance]() {
+            ~~~~~~~~~~~~~~~~~~~~
+!!! error TS2300: Duplicate identifier '[Symbol.hasInstance]'.
+            return "";
+        }
+        get [Symbol.hasInstance]() {
+            ~~~~~~~~~~~~~~~~~~~~
+!!! error TS2300: Duplicate identifier '[Symbol.hasInstance]'.
+            return "";
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty44.js b/tests/baselines/reference/symbolProperty44.js
new file mode 100644
index 0000000000000..d4824e79318a3
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty44.js
@@ -0,0 +1,23 @@
+//// [symbolProperty44.ts]
+class C {
+    get [Symbol.hasInstance]() {
+        return "";
+    }
+    get [Symbol.hasInstance]() {
+        return "";
+    }
+}
+
+//// [symbolProperty44.js]
+var C = (function () {
+    function C() {
+    }
+    Object.defineProperty(C.prototype, Symbol.hasInstance, {
+        get: function () {
+            return "";
+        },
+        enumerable: true,
+        configurable: true
+    });
+    return C;
+})();
diff --git a/tests/baselines/reference/symbolProperty45.js b/tests/baselines/reference/symbolProperty45.js
new file mode 100644
index 0000000000000..d056aba9f560d
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty45.js
@@ -0,0 +1,30 @@
+//// [symbolProperty45.ts]
+class C {
+    get [Symbol.hasInstance]() {
+        return "";
+    }
+    get [Symbol.toPrimitive]() {
+        return "";
+    }
+}
+
+//// [symbolProperty45.js]
+var C = (function () {
+    function C() {
+    }
+    Object.defineProperty(C.prototype, Symbol.hasInstance, {
+        get: function () {
+            return "";
+        },
+        enumerable: true,
+        configurable: true
+    });
+    Object.defineProperty(C.prototype, Symbol.toPrimitive, {
+        get: function () {
+            return "";
+        },
+        enumerable: true,
+        configurable: true
+    });
+    return C;
+})();
diff --git a/tests/baselines/reference/symbolProperty45.types b/tests/baselines/reference/symbolProperty45.types
new file mode 100644
index 0000000000000..24a74729aecab
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty45.types
@@ -0,0 +1,19 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty45.ts ===
+class C {
+>C : C
+
+    get [Symbol.hasInstance]() {
+>Symbol.hasInstance : symbol
+>Symbol : SymbolConstructor
+>hasInstance : symbol
+
+        return "";
+    }
+    get [Symbol.toPrimitive]() {
+>Symbol.toPrimitive : symbol
+>Symbol : SymbolConstructor
+>toPrimitive : symbol
+
+        return "";
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty46.errors.txt b/tests/baselines/reference/symbolProperty46.errors.txt
new file mode 100644
index 0000000000000..68f86afc31549
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty46.errors.txt
@@ -0,0 +1,17 @@
+tests/cases/conformance/es6/Symbols/symbolProperty46.ts(10,1): error TS2322: Type 'number' is not assignable to type 'string'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty46.ts (1 errors) ====
+    class C {
+        get [Symbol.hasInstance]() {
+            return "";
+        }
+        // Should take a string
+        set [Symbol.hasInstance](x) {
+        }
+    }
+    
+    (new C)[Symbol.hasInstance] = 0;
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2322: Type 'number' is not assignable to type 'string'.
+    (new C)[Symbol.hasInstance] = "";
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty46.js b/tests/baselines/reference/symbolProperty46.js
new file mode 100644
index 0000000000000..255fbac080944
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty46.js
@@ -0,0 +1,31 @@
+//// [symbolProperty46.ts]
+class C {
+    get [Symbol.hasInstance]() {
+        return "";
+    }
+    // Should take a string
+    set [Symbol.hasInstance](x) {
+    }
+}
+
+(new C)[Symbol.hasInstance] = 0;
+(new C)[Symbol.hasInstance] = "";
+
+//// [symbolProperty46.js]
+var C = (function () {
+    function C() {
+    }
+    Object.defineProperty(C.prototype, Symbol.hasInstance, {
+        get: function () {
+            return "";
+        },
+        // Should take a string
+        set: function (x) {
+        },
+        enumerable: true,
+        configurable: true
+    });
+    return C;
+})();
+(new C)[Symbol.hasInstance] = 0;
+(new C)[Symbol.hasInstance] = "";
diff --git a/tests/baselines/reference/symbolProperty47.errors.txt b/tests/baselines/reference/symbolProperty47.errors.txt
new file mode 100644
index 0000000000000..b35650f94bb3f
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty47.errors.txt
@@ -0,0 +1,20 @@
+tests/cases/conformance/es6/Symbols/symbolProperty47.ts(3,16): error TS2322: Type 'string' is not assignable to type 'number'.
+tests/cases/conformance/es6/Symbols/symbolProperty47.ts(11,1): error TS2322: Type 'string' is not assignable to type 'number'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty47.ts (2 errors) ====
+    class C {
+        get [Symbol.hasInstance]() {
+            return "";
+                   ~~
+!!! error TS2322: Type 'string' is not assignable to type 'number'.
+        }
+        // Should take a string
+        set [Symbol.hasInstance](x: number) {
+        }
+    }
+    
+    (new C)[Symbol.hasInstance] = 0;
+    (new C)[Symbol.hasInstance] = "";
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2322: Type 'string' is not assignable to type 'number'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty47.js b/tests/baselines/reference/symbolProperty47.js
new file mode 100644
index 0000000000000..92429c720c19e
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty47.js
@@ -0,0 +1,31 @@
+//// [symbolProperty47.ts]
+class C {
+    get [Symbol.hasInstance]() {
+        return "";
+    }
+    // Should take a string
+    set [Symbol.hasInstance](x: number) {
+    }
+}
+
+(new C)[Symbol.hasInstance] = 0;
+(new C)[Symbol.hasInstance] = "";
+
+//// [symbolProperty47.js]
+var C = (function () {
+    function C() {
+    }
+    Object.defineProperty(C.prototype, Symbol.hasInstance, {
+        get: function () {
+            return "";
+        },
+        // Should take a string
+        set: function (x) {
+        },
+        enumerable: true,
+        configurable: true
+    });
+    return C;
+})();
+(new C)[Symbol.hasInstance] = 0;
+(new C)[Symbol.hasInstance] = "";
diff --git a/tests/baselines/reference/symbolProperty48.errors.txt b/tests/baselines/reference/symbolProperty48.errors.txt
new file mode 100644
index 0000000000000..8d52fa48a0728
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty48.errors.txt
@@ -0,0 +1,13 @@
+tests/cases/conformance/es6/Symbols/symbolProperty48.ts(5,10): error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty48.ts (1 errors) ====
+    module M {
+        var Symbol;
+    
+        class C {
+            [Symbol.iterator]() { }
+             ~~~~~~~~~~~~~~~
+!!! error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty48.js b/tests/baselines/reference/symbolProperty48.js
new file mode 100644
index 0000000000000..48717470f2fe5
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty48.js
@@ -0,0 +1,20 @@
+//// [symbolProperty48.ts]
+module M {
+    var Symbol;
+
+    class C {
+        [Symbol.iterator]() { }
+    }
+}
+
+//// [symbolProperty48.js]
+var M;
+(function (M) {
+    var Symbol;
+    var C = (function () {
+        function C() {
+        }
+        C.prototype[Symbol.iterator] = function () { };
+        return C;
+    })();
+})(M || (M = {}));
diff --git a/tests/baselines/reference/symbolProperty49.errors.txt b/tests/baselines/reference/symbolProperty49.errors.txt
new file mode 100644
index 0000000000000..8a15b359ee7e8
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty49.errors.txt
@@ -0,0 +1,13 @@
+tests/cases/conformance/es6/Symbols/symbolProperty49.ts(5,10): error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty49.ts (1 errors) ====
+    module M {
+        export var Symbol;
+    
+        class C {
+            [Symbol.iterator]() { }
+             ~~~~~~~~~~~~~~~
+!!! error TS2471: A computed property name of the form 'Symbol.iterator' must be of type 'symbol'.
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty49.js b/tests/baselines/reference/symbolProperty49.js
new file mode 100644
index 0000000000000..6c115a89ae403
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty49.js
@@ -0,0 +1,20 @@
+//// [symbolProperty49.ts]
+module M {
+    export var Symbol;
+
+    class C {
+        [Symbol.iterator]() { }
+    }
+}
+
+//// [symbolProperty49.js]
+var M;
+(function (M) {
+    M.Symbol;
+    var C = (function () {
+        function C() {
+        }
+        C.prototype[M.Symbol.iterator] = function () { };
+        return C;
+    })();
+})(M || (M = {}));
diff --git a/tests/baselines/reference/symbolProperty5.js b/tests/baselines/reference/symbolProperty5.js
new file mode 100644
index 0000000000000..c7c88681f8a4c
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty5.js
@@ -0,0 +1,17 @@
+//// [symbolProperty5.ts]
+var x = {
+    [Symbol.iterator]: 0,
+    [Symbol.isRegExp]() { },
+    get [Symbol.toStringTag]() {
+        return 0;
+    }
+}
+
+//// [symbolProperty5.js]
+var x = {
+    [Symbol.iterator]: 0,
+    [Symbol.isRegExp]() { },
+    get [Symbol.toStringTag]() {
+        return 0;
+    }
+};
diff --git a/tests/baselines/reference/symbolProperty5.types b/tests/baselines/reference/symbolProperty5.types
new file mode 100644
index 0000000000000..7d6a9f0585855
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty5.types
@@ -0,0 +1,23 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty5.ts ===
+var x = {
+>x : { [Symbol.iterator]: number; [Symbol.isRegExp](): void; [Symbol.toStringTag]: number; }
+>{    [Symbol.iterator]: 0,    [Symbol.isRegExp]() { },    get [Symbol.toStringTag]() {        return 0;    }} : { [Symbol.iterator]: number; [Symbol.isRegExp](): void; [Symbol.toStringTag]: number; }
+
+    [Symbol.iterator]: 0,
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+    [Symbol.isRegExp]() { },
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+
+    get [Symbol.toStringTag]() {
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+
+        return 0;
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty50.js b/tests/baselines/reference/symbolProperty50.js
new file mode 100644
index 0000000000000..61ded053938f6
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty50.js
@@ -0,0 +1,19 @@
+//// [symbolProperty50.ts]
+module M {
+    interface Symbol { }
+
+    class C {
+        [Symbol.iterator]() { }
+    }
+}
+
+//// [symbolProperty50.js]
+var M;
+(function (M) {
+    var C = (function () {
+        function C() {
+        }
+        C.prototype[Symbol.iterator] = function () { };
+        return C;
+    })();
+})(M || (M = {}));
diff --git a/tests/baselines/reference/symbolProperty50.types b/tests/baselines/reference/symbolProperty50.types
new file mode 100644
index 0000000000000..8258dfe1b72b8
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty50.types
@@ -0,0 +1,16 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty50.ts ===
+module M {
+>M : typeof M
+
+    interface Symbol { }
+>Symbol : Symbol
+
+    class C {
+>C : C
+
+        [Symbol.iterator]() { }
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty51.js b/tests/baselines/reference/symbolProperty51.js
new file mode 100644
index 0000000000000..246dbaaa1734c
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty51.js
@@ -0,0 +1,19 @@
+//// [symbolProperty51.ts]
+module M {
+    module Symbol { }
+
+    class C {
+        [Symbol.iterator]() { }
+    }
+}
+
+//// [symbolProperty51.js]
+var M;
+(function (M) {
+    var C = (function () {
+        function C() {
+        }
+        C.prototype[Symbol.iterator] = function () { };
+        return C;
+    })();
+})(M || (M = {}));
diff --git a/tests/baselines/reference/symbolProperty51.types b/tests/baselines/reference/symbolProperty51.types
new file mode 100644
index 0000000000000..6677b3b2e2d37
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty51.types
@@ -0,0 +1,16 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty51.ts ===
+module M {
+>M : typeof M
+
+    module Symbol { }
+>Symbol : unknown
+
+    class C {
+>C : C
+
+        [Symbol.iterator]() { }
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty52.errors.txt b/tests/baselines/reference/symbolProperty52.errors.txt
new file mode 100644
index 0000000000000..5a44918d56489
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty52.errors.txt
@@ -0,0 +1,21 @@
+tests/cases/conformance/es6/Symbols/symbolProperty52.ts(2,13): error TS2339: Property 'nonsense' does not exist on type 'SymbolConstructor'.
+tests/cases/conformance/es6/Symbols/symbolProperty52.ts(5,1): error TS2322: Type '{}' is not assignable to type '{ [Symbol.nonsense]: number; }'.
+  Property '[Symbol.nonsense]' is missing in type '{}'.
+tests/cases/conformance/es6/Symbols/symbolProperty52.ts(7,12): error TS2339: Property 'nonsense' does not exist on type 'SymbolConstructor'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty52.ts (3 errors) ====
+    var obj = {
+        [Symbol.nonsense]: 0
+                ~~~~~~~~
+!!! error TS2339: Property 'nonsense' does not exist on type 'SymbolConstructor'.
+    };
+    
+    obj = {};
+    ~~~
+!!! error TS2322: Type '{}' is not assignable to type '{ [Symbol.nonsense]: number; }'.
+!!! error TS2322:   Property '[Symbol.nonsense]' is missing in type '{}'.
+    
+    obj[Symbol.nonsense];
+               ~~~~~~~~
+!!! error TS2339: Property 'nonsense' does not exist on type 'SymbolConstructor'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty52.js b/tests/baselines/reference/symbolProperty52.js
new file mode 100644
index 0000000000000..1bf4a47de7fa1
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty52.js
@@ -0,0 +1,15 @@
+//// [symbolProperty52.ts]
+var obj = {
+    [Symbol.nonsense]: 0
+};
+
+obj = {};
+
+obj[Symbol.nonsense];
+
+//// [symbolProperty52.js]
+var obj = {
+    [Symbol.nonsense]: 0
+};
+obj = {};
+obj[Symbol.nonsense];
diff --git a/tests/baselines/reference/symbolProperty53.errors.txt b/tests/baselines/reference/symbolProperty53.errors.txt
new file mode 100644
index 0000000000000..7658744eb55f0
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty53.errors.txt
@@ -0,0 +1,14 @@
+tests/cases/conformance/es6/Symbols/symbolProperty53.ts(2,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+tests/cases/conformance/es6/Symbols/symbolProperty53.ts(5,1): error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty53.ts (2 errors) ====
+    var obj = {
+        [Symbol.for]: 0
+        ~~~~~~~~~~~~
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+    };
+    
+    obj[Symbol.for];
+    ~~~~~~~~~~~~~~~
+!!! error TS2342: An index expression argument must be of type 'string', 'number', 'symbol, or 'any'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty53.js b/tests/baselines/reference/symbolProperty53.js
new file mode 100644
index 0000000000000..71c82d14917ca
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty53.js
@@ -0,0 +1,12 @@
+//// [symbolProperty53.ts]
+var obj = {
+    [Symbol.for]: 0
+};
+
+obj[Symbol.for];
+
+//// [symbolProperty53.js]
+var obj = {
+    [Symbol.for]: 0
+};
+obj[Symbol.for];
diff --git a/tests/baselines/reference/symbolProperty54.errors.txt b/tests/baselines/reference/symbolProperty54.errors.txt
new file mode 100644
index 0000000000000..b634b4edb0f94
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty54.errors.txt
@@ -0,0 +1,9 @@
+tests/cases/conformance/es6/Symbols/symbolProperty54.ts(2,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty54.ts (1 errors) ====
+    var obj = {
+        [Symbol.prototype]: 0
+        ~~~~~~~~~~~~~~~~~~
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+    };
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty54.js b/tests/baselines/reference/symbolProperty54.js
new file mode 100644
index 0000000000000..ace8a7ca9269d
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty54.js
@@ -0,0 +1,9 @@
+//// [symbolProperty54.ts]
+var obj = {
+    [Symbol.prototype]: 0
+};
+
+//// [symbolProperty54.js]
+var obj = {
+    [Symbol.prototype]: 0
+};
diff --git a/tests/baselines/reference/symbolProperty55.js b/tests/baselines/reference/symbolProperty55.js
new file mode 100644
index 0000000000000..e19e2d8e2f65c
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty55.js
@@ -0,0 +1,23 @@
+//// [symbolProperty55.ts]
+var obj = {
+    [Symbol.iterator]: 0
+};
+
+module M {
+    var Symbol: SymbolConstructor;
+    // The following should be of type 'any'. This is because even though obj has a property keyed by Symbol.iterator,
+    // the key passed in here is the *wrong* Symbol.iterator. It is not the iterator property of the global Symbol.
+    obj[Symbol.iterator];
+}
+
+//// [symbolProperty55.js]
+var obj = {
+    [Symbol.iterator]: 0
+};
+var M;
+(function (M) {
+    var Symbol;
+    // The following should be of type 'any'. This is because even though obj has a property keyed by Symbol.iterator,
+    // the key passed in here is the *wrong* Symbol.iterator. It is not the iterator property of the global Symbol.
+    obj[Symbol.iterator];
+})(M || (M = {}));
diff --git a/tests/baselines/reference/symbolProperty55.types b/tests/baselines/reference/symbolProperty55.types
new file mode 100644
index 0000000000000..34b32e27eae52
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty55.types
@@ -0,0 +1,28 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty55.ts ===
+var obj = {
+>obj : { [Symbol.iterator]: number; }
+>{    [Symbol.iterator]: 0} : { [Symbol.iterator]: number; }
+
+    [Symbol.iterator]: 0
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+};
+
+module M {
+>M : typeof M
+
+    var Symbol: SymbolConstructor;
+>Symbol : SymbolConstructor
+>SymbolConstructor : SymbolConstructor
+
+    // The following should be of type 'any'. This is because even though obj has a property keyed by Symbol.iterator,
+    // the key passed in here is the *wrong* Symbol.iterator. It is not the iterator property of the global Symbol.
+    obj[Symbol.iterator];
+>obj[Symbol.iterator] : any
+>obj : { [Symbol.iterator]: number; }
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+}
diff --git a/tests/baselines/reference/symbolProperty56.js b/tests/baselines/reference/symbolProperty56.js
new file mode 100644
index 0000000000000..fea4520c2f8d9
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty56.js
@@ -0,0 +1,23 @@
+//// [symbolProperty56.ts]
+var obj = {
+    [Symbol.iterator]: 0
+};
+
+module M {
+    var Symbol: {};
+    // The following should be of type 'any'. This is because even though obj has a property keyed by Symbol.iterator,
+    // the key passed in here is the *wrong* Symbol.iterator. It is not the iterator property of the global Symbol.
+    obj[Symbol["iterator"]];
+}
+
+//// [symbolProperty56.js]
+var obj = {
+    [Symbol.iterator]: 0
+};
+var M;
+(function (M) {
+    var Symbol;
+    // The following should be of type 'any'. This is because even though obj has a property keyed by Symbol.iterator,
+    // the key passed in here is the *wrong* Symbol.iterator. It is not the iterator property of the global Symbol.
+    obj[Symbol["iterator"]];
+})(M || (M = {}));
diff --git a/tests/baselines/reference/symbolProperty56.types b/tests/baselines/reference/symbolProperty56.types
new file mode 100644
index 0000000000000..8fc2e97b7517a
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty56.types
@@ -0,0 +1,26 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty56.ts ===
+var obj = {
+>obj : { [Symbol.iterator]: number; }
+>{    [Symbol.iterator]: 0} : { [Symbol.iterator]: number; }
+
+    [Symbol.iterator]: 0
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+};
+
+module M {
+>M : typeof M
+
+    var Symbol: {};
+>Symbol : {}
+
+    // The following should be of type 'any'. This is because even though obj has a property keyed by Symbol.iterator,
+    // the key passed in here is the *wrong* Symbol.iterator. It is not the iterator property of the global Symbol.
+    obj[Symbol["iterator"]];
+>obj[Symbol["iterator"]] : any
+>obj : { [Symbol.iterator]: number; }
+>Symbol["iterator"] : any
+>Symbol : {}
+}
diff --git a/tests/baselines/reference/symbolProperty57.js b/tests/baselines/reference/symbolProperty57.js
new file mode 100644
index 0000000000000..8fffcba3e27e9
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty57.js
@@ -0,0 +1,14 @@
+//// [symbolProperty57.ts]
+var obj = {
+    [Symbol.iterator]: 0
+};
+
+// Should give type 'any'.
+obj[Symbol["nonsense"]];
+
+//// [symbolProperty57.js]
+var obj = {
+    [Symbol.iterator]: 0
+};
+// Should give type 'any'.
+obj[Symbol["nonsense"]];
diff --git a/tests/baselines/reference/symbolProperty57.types b/tests/baselines/reference/symbolProperty57.types
new file mode 100644
index 0000000000000..013c008ce125a
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty57.types
@@ -0,0 +1,19 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty57.ts ===
+var obj = {
+>obj : { [Symbol.iterator]: number; }
+>{    [Symbol.iterator]: 0} : { [Symbol.iterator]: number; }
+
+    [Symbol.iterator]: 0
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+};
+
+// Should give type 'any'.
+obj[Symbol["nonsense"]];
+>obj[Symbol["nonsense"]] : any
+>obj : { [Symbol.iterator]: number; }
+>Symbol["nonsense"] : any
+>Symbol : SymbolConstructor
+
diff --git a/tests/baselines/reference/symbolProperty58.errors.txt b/tests/baselines/reference/symbolProperty58.errors.txt
new file mode 100644
index 0000000000000..5f8b117a74c1b
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty58.errors.txt
@@ -0,0 +1,13 @@
+tests/cases/conformance/es6/Symbols/symbolProperty58.ts(6,6): error TS2471: A computed property name of the form 'Symbol.foo' must be of type 'symbol'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty58.ts (1 errors) ====
+    interface SymbolConstructor {
+        foo: string;
+    }
+    
+    var obj = {
+        [Symbol.foo]: 0
+         ~~~~~~~~~~
+!!! error TS2471: A computed property name of the form 'Symbol.foo' must be of type 'symbol'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty58.js b/tests/baselines/reference/symbolProperty58.js
new file mode 100644
index 0000000000000..94b22156b1a21
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty58.js
@@ -0,0 +1,13 @@
+//// [symbolProperty58.ts]
+interface SymbolConstructor {
+    foo: string;
+}
+
+var obj = {
+    [Symbol.foo]: 0
+}
+
+//// [symbolProperty58.js]
+var obj = {
+    [Symbol.foo]: 0
+};
diff --git a/tests/baselines/reference/symbolProperty59.errors.txt b/tests/baselines/reference/symbolProperty59.errors.txt
new file mode 100644
index 0000000000000..dfb2ece3d21f1
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty59.errors.txt
@@ -0,0 +1,9 @@
+tests/cases/conformance/es6/Symbols/symbolProperty59.ts(2,5): error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty59.ts (1 errors) ====
+    interface I {
+        [Symbol.keyFor]: string;
+        ~~~~~~~~~~~~~~~
+!!! error TS2464: A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty59.js b/tests/baselines/reference/symbolProperty59.js
new file mode 100644
index 0000000000000..78d1d212f2819
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty59.js
@@ -0,0 +1,6 @@
+//// [symbolProperty59.ts]
+interface I {
+    [Symbol.keyFor]: string;
+}
+
+//// [symbolProperty59.js]
diff --git a/tests/baselines/reference/symbolProperty6.js b/tests/baselines/reference/symbolProperty6.js
new file mode 100644
index 0000000000000..aee61b97435b8
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty6.js
@@ -0,0 +1,25 @@
+//// [symbolProperty6.ts]
+class C {
+    [Symbol.iterator] = 0;
+    [Symbol.unscopables]: number;
+    [Symbol.isRegExp]() { }
+    get [Symbol.toStringTag]() {
+        return 0;
+    }
+}
+
+//// [symbolProperty6.js]
+var C = (function () {
+    function C() {
+        this[Symbol.iterator] = 0;
+    }
+    C.prototype[Symbol.isRegExp] = function () { };
+    Object.defineProperty(C.prototype, Symbol.toStringTag, {
+        get: function () {
+            return 0;
+        },
+        enumerable: true,
+        configurable: true
+    });
+    return C;
+})();
diff --git a/tests/baselines/reference/symbolProperty6.types b/tests/baselines/reference/symbolProperty6.types
new file mode 100644
index 0000000000000..e5aac6f48daeb
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty6.types
@@ -0,0 +1,27 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty6.ts ===
+class C {
+>C : C
+
+    [Symbol.iterator] = 0;
+>Symbol.iterator : symbol
+>Symbol : SymbolConstructor
+>iterator : symbol
+
+    [Symbol.unscopables]: number;
+>Symbol.unscopables : symbol
+>Symbol : SymbolConstructor
+>unscopables : symbol
+
+    [Symbol.isRegExp]() { }
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+
+    get [Symbol.toStringTag]() {
+>Symbol.toStringTag : symbol
+>Symbol : SymbolConstructor
+>toStringTag : symbol
+
+        return 0;
+    }
+}
diff --git a/tests/baselines/reference/symbolProperty7.errors.txt b/tests/baselines/reference/symbolProperty7.errors.txt
new file mode 100644
index 0000000000000..652f637d852d0
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty7.errors.txt
@@ -0,0 +1,17 @@
+tests/cases/conformance/es6/Symbols/symbolProperty7.ts(2,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+tests/cases/conformance/es6/Symbols/symbolProperty7.ts(3,5): error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty7.ts (2 errors) ====
+    class C {
+        [Symbol()] = 0;
+        ~~~~~~~~~~
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+        [Symbol()]: number;
+        ~~~~~~~~~~
+!!! error TS1166: A computed property name in a class property declaration must directly refer to a built-in symbol.
+        [Symbol()]() { }
+        get [Symbol()]() {
+            return 0;
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty7.js b/tests/baselines/reference/symbolProperty7.js
new file mode 100644
index 0000000000000..781113572a177
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty7.js
@@ -0,0 +1,25 @@
+//// [symbolProperty7.ts]
+class C {
+    [Symbol()] = 0;
+    [Symbol()]: number;
+    [Symbol()]() { }
+    get [Symbol()]() {
+        return 0;
+    }
+}
+
+//// [symbolProperty7.js]
+var C = (function () {
+    function C() {
+        this[Symbol()] = 0;
+    }
+    C.prototype[Symbol()] = function () { };
+    Object.defineProperty(C.prototype, Symbol(), {
+        get: function () {
+            return 0;
+        },
+        enumerable: true,
+        configurable: true
+    });
+    return C;
+})();
diff --git a/tests/baselines/reference/symbolProperty8.js b/tests/baselines/reference/symbolProperty8.js
new file mode 100644
index 0000000000000..6f3ec6cfa2685
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty8.js
@@ -0,0 +1,7 @@
+//// [symbolProperty8.ts]
+interface I {
+    [Symbol.unscopables]: number;
+    [Symbol.isRegExp]();
+}
+
+//// [symbolProperty8.js]
diff --git a/tests/baselines/reference/symbolProperty8.types b/tests/baselines/reference/symbolProperty8.types
new file mode 100644
index 0000000000000..d6c2f464b5305
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty8.types
@@ -0,0 +1,14 @@
+=== tests/cases/conformance/es6/Symbols/symbolProperty8.ts ===
+interface I {
+>I : I
+
+    [Symbol.unscopables]: number;
+>Symbol.unscopables : symbol
+>Symbol : SymbolConstructor
+>unscopables : symbol
+
+    [Symbol.isRegExp]();
+>Symbol.isRegExp : symbol
+>Symbol : SymbolConstructor
+>isRegExp : symbol
+}
diff --git a/tests/baselines/reference/symbolProperty9.errors.txt b/tests/baselines/reference/symbolProperty9.errors.txt
new file mode 100644
index 0000000000000..e621ab6c5a6ee
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty9.errors.txt
@@ -0,0 +1,22 @@
+tests/cases/conformance/es6/Symbols/symbolProperty9.ts(10,5): error TS2322: Type 'I' is not assignable to type 'C'.
+  Types of property '[Symbol.iterator]' are incompatible.
+    Type '{ x: any; }' is not assignable to type '{ x: any; y: any; }'.
+      Property 'y' is missing in type '{ x: any; }'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolProperty9.ts (1 errors) ====
+    class C {
+        [Symbol.iterator]: { x; y };
+    }
+    interface I {
+        [Symbol.iterator]: { x };
+    }
+    
+    var i: I;
+    i = new C;
+    var c: C = i;
+        ~
+!!! error TS2322: Type 'I' is not assignable to type 'C'.
+!!! error TS2322:   Types of property '[Symbol.iterator]' are incompatible.
+!!! error TS2322:     Type '{ x: any; }' is not assignable to type '{ x: any; y: any; }'.
+!!! error TS2322:       Property 'y' is missing in type '{ x: any; }'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolProperty9.js b/tests/baselines/reference/symbolProperty9.js
new file mode 100644
index 0000000000000..f97a1d44a21df
--- /dev/null
+++ b/tests/baselines/reference/symbolProperty9.js
@@ -0,0 +1,21 @@
+//// [symbolProperty9.ts]
+class C {
+    [Symbol.iterator]: { x; y };
+}
+interface I {
+    [Symbol.iterator]: { x };
+}
+
+var i: I;
+i = new C;
+var c: C = i;
+
+//// [symbolProperty9.js]
+var C = (function () {
+    function C() {
+    }
+    return C;
+})();
+var i;
+i = new C;
+var c = i;
diff --git a/tests/baselines/reference/symbolType1.errors.txt b/tests/baselines/reference/symbolType1.errors.txt
new file mode 100644
index 0000000000000..00873ccc87179
--- /dev/null
+++ b/tests/baselines/reference/symbolType1.errors.txt
@@ -0,0 +1,16 @@
+tests/cases/conformance/es6/Symbols/symbolType1.ts(1,1): error TS2358: The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter.
+tests/cases/conformance/es6/Symbols/symbolType1.ts(2,19): error TS2359: The right-hand side of an 'instanceof' expression must be of type 'any' or of a type assignable to the 'Function' interface type.
+tests/cases/conformance/es6/Symbols/symbolType1.ts(4,19): error TS2359: The right-hand side of an 'instanceof' expression must be of type 'any' or of a type assignable to the 'Function' interface type.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType1.ts (3 errors) ====
+    Symbol() instanceof Symbol;
+    ~~~~~~~~
+!!! error TS2358: The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter.
+    Symbol instanceof Symbol();
+                      ~~~~~~~~
+!!! error TS2359: The right-hand side of an 'instanceof' expression must be of type 'any' or of a type assignable to the 'Function' interface type.
+    (Symbol() || {}) instanceof Object; // This one should be okay, it's a valid way of distinguishing types
+    Symbol instanceof (Symbol() || {});
+                      ~~~~~~~~~~~~~~~~
+!!! error TS2359: The right-hand side of an 'instanceof' expression must be of type 'any' or of a type assignable to the 'Function' interface type.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType1.js b/tests/baselines/reference/symbolType1.js
new file mode 100644
index 0000000000000..90fb540516228
--- /dev/null
+++ b/tests/baselines/reference/symbolType1.js
@@ -0,0 +1,11 @@
+//// [symbolType1.ts]
+Symbol() instanceof Symbol;
+Symbol instanceof Symbol();
+(Symbol() || {}) instanceof Object; // This one should be okay, it's a valid way of distinguishing types
+Symbol instanceof (Symbol() || {});
+
+//// [symbolType1.js]
+Symbol() instanceof Symbol;
+Symbol instanceof Symbol();
+(Symbol() || {}) instanceof Object; // This one should be okay, it's a valid way of distinguishing types
+Symbol instanceof (Symbol() || {});
diff --git a/tests/baselines/reference/symbolType10.errors.txt b/tests/baselines/reference/symbolType10.errors.txt
new file mode 100644
index 0000000000000..852f863bae852
--- /dev/null
+++ b/tests/baselines/reference/symbolType10.errors.txt
@@ -0,0 +1,34 @@
+tests/cases/conformance/es6/Symbols/symbolType10.ts(2,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType10.ts(2,5): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType10.ts(3,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType10.ts(3,5): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType10.ts(4,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType10.ts(4,5): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType10.ts(6,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType10.ts(7,5): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType10.ts (8 errors) ====
+    var s = Symbol.for("bitwise");
+    s & s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+        ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s | s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+        ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s ^ s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+        ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    
+    s & 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    0 | s;
+        ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType10.js b/tests/baselines/reference/symbolType10.js
new file mode 100644
index 0000000000000..378479fb70fc2
--- /dev/null
+++ b/tests/baselines/reference/symbolType10.js
@@ -0,0 +1,16 @@
+//// [symbolType10.ts]
+var s = Symbol.for("bitwise");
+s & s;
+s | s;
+s ^ s;
+
+s & 0;
+0 | s;
+
+//// [symbolType10.js]
+var s = Symbol.for("bitwise");
+s & s;
+s | s;
+s ^ s;
+s & 0;
+0 | s;
diff --git a/tests/baselines/reference/symbolType11.js b/tests/baselines/reference/symbolType11.js
new file mode 100644
index 0000000000000..3328be28d154c
--- /dev/null
+++ b/tests/baselines/reference/symbolType11.js
@@ -0,0 +1,17 @@
+//// [symbolType11.ts]
+var s = Symbol.for("logical");
+s && s;
+s && [];
+0 && s;
+s || s;
+s || 1;
+({}) || s;
+
+//// [symbolType11.js]
+var s = Symbol.for("logical");
+s && s;
+s && [];
+0 && s;
+s || s;
+s || 1;
+({}) || s;
diff --git a/tests/baselines/reference/symbolType11.types b/tests/baselines/reference/symbolType11.types
new file mode 100644
index 0000000000000..21de110854cde
--- /dev/null
+++ b/tests/baselines/reference/symbolType11.types
@@ -0,0 +1,37 @@
+=== tests/cases/conformance/es6/Symbols/symbolType11.ts ===
+var s = Symbol.for("logical");
+>s : symbol
+>Symbol.for("logical") : symbol
+>Symbol.for : (key: string) => symbol
+>Symbol : SymbolConstructor
+>for : (key: string) => symbol
+
+s && s;
+>s && s : symbol
+>s : symbol
+>s : symbol
+
+s && [];
+>s && [] : undefined[]
+>s : symbol
+>[] : undefined[]
+
+0 && s;
+>0 && s : symbol
+>s : symbol
+
+s || s;
+>s || s : symbol
+>s : symbol
+>s : symbol
+
+s || 1;
+>s || 1 : number | symbol
+>s : symbol
+
+({}) || s;
+>({}) || s : {}
+>({}) : {}
+>{} : {}
+>s : symbol
+
diff --git a/tests/baselines/reference/symbolType12.errors.txt b/tests/baselines/reference/symbolType12.errors.txt
new file mode 100644
index 0000000000000..adceb58ae56d0
--- /dev/null
+++ b/tests/baselines/reference/symbolType12.errors.txt
@@ -0,0 +1,136 @@
+tests/cases/conformance/es6/Symbols/symbolType12.ts(3,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(3,6): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(4,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(5,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(5,6): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(6,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(7,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(7,6): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(8,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(9,1): error TS2365: Operator '+=' cannot be applied to types 'symbol' and 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(10,1): error TS2365: Operator '+=' cannot be applied to types 'symbol' and 'number'.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(11,1): error TS2469: The '+=' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(12,8): error TS2469: The '+=' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(13,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(13,6): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(14,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(15,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(15,7): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(16,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(17,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(17,7): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(18,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(19,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(19,8): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(20,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(21,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(21,6): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(22,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(23,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(23,6): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(24,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(25,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(25,6): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(26,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType12.ts(28,8): error TS2469: The '+=' operator cannot be applied to type 'symbol'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType12.ts (35 errors) ====
+    var s = Symbol.for("assign");
+    var str = "";
+    s *= s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+         ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s *= 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s /= s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+         ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s /= 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s %= s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+         ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s %= 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s += s;
+    ~~~~~~
+!!! error TS2365: Operator '+=' cannot be applied to types 'symbol' and 'symbol'.
+    s += 0;
+    ~~~~~~
+!!! error TS2365: Operator '+=' cannot be applied to types 'symbol' and 'number'.
+    s += "";
+    ~
+!!! error TS2469: The '+=' operator cannot be applied to type 'symbol'.
+    str += s;
+           ~
+!!! error TS2469: The '+=' operator cannot be applied to type 'symbol'.
+    s -= s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+         ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s -= 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s <<= s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+          ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s <<= 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s >>= s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+          ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s >>= 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s >>>= s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+           ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s >>>= 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s &= s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+         ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s &= 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s ^= s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+         ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s ^= 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s |= s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+         ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s |= 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    
+    str += (s || str);
+           ~~~~~~~~~~
+!!! error TS2469: The '+=' operator cannot be applied to type 'symbol'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType12.js b/tests/baselines/reference/symbolType12.js
new file mode 100644
index 0000000000000..069846e136fdf
--- /dev/null
+++ b/tests/baselines/reference/symbolType12.js
@@ -0,0 +1,58 @@
+//// [symbolType12.ts]
+var s = Symbol.for("assign");
+var str = "";
+s *= s;
+s *= 0;
+s /= s;
+s /= 0;
+s %= s;
+s %= 0;
+s += s;
+s += 0;
+s += "";
+str += s;
+s -= s;
+s -= 0;
+s <<= s;
+s <<= 0;
+s >>= s;
+s >>= 0;
+s >>>= s;
+s >>>= 0;
+s &= s;
+s &= 0;
+s ^= s;
+s ^= 0;
+s |= s;
+s |= 0;
+
+str += (s || str);
+
+//// [symbolType12.js]
+var s = Symbol.for("assign");
+var str = "";
+s *= s;
+s *= 0;
+s /= s;
+s /= 0;
+s %= s;
+s %= 0;
+s += s;
+s += 0;
+s += "";
+str += s;
+s -= s;
+s -= 0;
+s <<= s;
+s <<= 0;
+s >>= s;
+s >>= 0;
+s >>>= s;
+s >>>= 0;
+s &= s;
+s &= 0;
+s ^= s;
+s ^= 0;
+s |= s;
+s |= 0;
+str += (s || str);
diff --git a/tests/baselines/reference/symbolType13.errors.txt b/tests/baselines/reference/symbolType13.errors.txt
new file mode 100644
index 0000000000000..68981d0072bb9
--- /dev/null
+++ b/tests/baselines/reference/symbolType13.errors.txt
@@ -0,0 +1,18 @@
+tests/cases/conformance/es6/Symbols/symbolType13.ts(4,6): error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
+tests/cases/conformance/es6/Symbols/symbolType13.ts(5,11): error TS2407: The right-hand side of a 'for...in' statement must be of type 'any', an object type or a type parameter.
+tests/cases/conformance/es6/Symbols/symbolType13.ts(6,15): error TS2407: The right-hand side of a 'for...in' statement must be of type 'any', an object type or a type parameter.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType13.ts (3 errors) ====
+    var s = Symbol();
+    var x: any;
+    
+    for (s in {}) { }
+         ~
+!!! error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
+    for (x in s) { }
+              ~
+!!! error TS2407: The right-hand side of a 'for...in' statement must be of type 'any', an object type or a type parameter.
+    for (var y in s) { }
+                  ~
+!!! error TS2407: The right-hand side of a 'for...in' statement must be of type 'any', an object type or a type parameter.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType13.js b/tests/baselines/reference/symbolType13.js
new file mode 100644
index 0000000000000..afd62079bb5a8
--- /dev/null
+++ b/tests/baselines/reference/symbolType13.js
@@ -0,0 +1,14 @@
+//// [symbolType13.ts]
+var s = Symbol();
+var x: any;
+
+for (s in {}) { }
+for (x in s) { }
+for (var y in s) { }
+
+//// [symbolType13.js]
+var s = Symbol();
+var x;
+for (s in {}) { }
+for (x in s) { }
+for (var y in s) { }
diff --git a/tests/baselines/reference/symbolType14.errors.txt b/tests/baselines/reference/symbolType14.errors.txt
new file mode 100644
index 0000000000000..a31230efe2351
--- /dev/null
+++ b/tests/baselines/reference/symbolType14.errors.txt
@@ -0,0 +1,7 @@
+tests/cases/conformance/es6/Symbols/symbolType14.ts(1,1): error TS2350: Only a void function can be called with the 'new' keyword.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType14.ts (1 errors) ====
+    new Symbol();
+    ~~~~~~~~~~~~
+!!! error TS2350: Only a void function can be called with the 'new' keyword.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType14.js b/tests/baselines/reference/symbolType14.js
new file mode 100644
index 0000000000000..4bbd24f30d96a
--- /dev/null
+++ b/tests/baselines/reference/symbolType14.js
@@ -0,0 +1,5 @@
+//// [symbolType14.ts]
+new Symbol();
+
+//// [symbolType14.js]
+new Symbol();
diff --git a/tests/baselines/reference/symbolType15.errors.txt b/tests/baselines/reference/symbolType15.errors.txt
new file mode 100644
index 0000000000000..eb63e5798d5e2
--- /dev/null
+++ b/tests/baselines/reference/symbolType15.errors.txt
@@ -0,0 +1,11 @@
+tests/cases/conformance/es6/Symbols/symbolType15.ts(5,1): error TS2322: Type 'Symbol' is not assignable to type 'symbol'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType15.ts (1 errors) ====
+    var sym: symbol;
+    var symObj: Symbol;
+    
+    symObj = sym;
+    sym = symObj;
+    ~~~
+!!! error TS2322: Type 'Symbol' is not assignable to type 'symbol'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType15.js b/tests/baselines/reference/symbolType15.js
new file mode 100644
index 0000000000000..1c3519d603e95
--- /dev/null
+++ b/tests/baselines/reference/symbolType15.js
@@ -0,0 +1,12 @@
+//// [symbolType15.ts]
+var sym: symbol;
+var symObj: Symbol;
+
+symObj = sym;
+sym = symObj;
+
+//// [symbolType15.js]
+var sym;
+var symObj;
+symObj = sym;
+sym = symObj;
diff --git a/tests/baselines/reference/symbolType16.js b/tests/baselines/reference/symbolType16.js
new file mode 100644
index 0000000000000..65a95dd8365d6
--- /dev/null
+++ b/tests/baselines/reference/symbolType16.js
@@ -0,0 +1,11 @@
+//// [symbolType16.ts]
+interface Symbol {
+    newSymbolProp: number;
+}
+
+var sym: symbol;
+sym.newSymbolProp;
+
+//// [symbolType16.js]
+var sym;
+sym.newSymbolProp;
diff --git a/tests/baselines/reference/symbolType16.types b/tests/baselines/reference/symbolType16.types
new file mode 100644
index 0000000000000..91fdc9978da08
--- /dev/null
+++ b/tests/baselines/reference/symbolType16.types
@@ -0,0 +1,16 @@
+=== tests/cases/conformance/es6/Symbols/symbolType16.ts ===
+interface Symbol {
+>Symbol : Symbol
+
+    newSymbolProp: number;
+>newSymbolProp : number
+}
+
+var sym: symbol;
+>sym : symbol
+
+sym.newSymbolProp;
+>sym.newSymbolProp : number
+>sym : symbol
+>newSymbolProp : number
+
diff --git a/tests/baselines/reference/symbolType17.js b/tests/baselines/reference/symbolType17.js
new file mode 100644
index 0000000000000..a00d2cb36f773
--- /dev/null
+++ b/tests/baselines/reference/symbolType17.js
@@ -0,0 +1,21 @@
+//// [symbolType17.ts]
+interface Foo { prop }
+var x: symbol | Foo;
+
+x;
+if (typeof x === "symbol") {
+    x;
+}
+else {
+    x;
+}
+
+//// [symbolType17.js]
+var x;
+x;
+if (typeof x === "symbol") {
+    x;
+}
+else {
+    x;
+}
diff --git a/tests/baselines/reference/symbolType17.types b/tests/baselines/reference/symbolType17.types
new file mode 100644
index 0000000000000..b86d5a70ff796
--- /dev/null
+++ b/tests/baselines/reference/symbolType17.types
@@ -0,0 +1,24 @@
+=== tests/cases/conformance/es6/Symbols/symbolType17.ts ===
+interface Foo { prop }
+>Foo : Foo
+>prop : any
+
+var x: symbol | Foo;
+>x : symbol | Foo
+>Foo : Foo
+
+x;
+>x : symbol | Foo
+
+if (typeof x === "symbol") {
+>typeof x === "symbol" : boolean
+>typeof x : string
+>x : symbol | Foo
+
+    x;
+>x : symbol
+}
+else {
+    x;
+>x : Foo
+}
diff --git a/tests/baselines/reference/symbolType18.js b/tests/baselines/reference/symbolType18.js
new file mode 100644
index 0000000000000..f8a784d2500bc
--- /dev/null
+++ b/tests/baselines/reference/symbolType18.js
@@ -0,0 +1,21 @@
+//// [symbolType18.ts]
+interface Foo { prop }
+var x: symbol | Foo;
+
+x;
+if (typeof x === "object") {
+    x;
+}
+else {
+    x;
+}
+
+//// [symbolType18.js]
+var x;
+x;
+if (typeof x === "object") {
+    x;
+}
+else {
+    x;
+}
diff --git a/tests/baselines/reference/symbolType18.types b/tests/baselines/reference/symbolType18.types
new file mode 100644
index 0000000000000..1693c6e2499bc
--- /dev/null
+++ b/tests/baselines/reference/symbolType18.types
@@ -0,0 +1,24 @@
+=== tests/cases/conformance/es6/Symbols/symbolType18.ts ===
+interface Foo { prop }
+>Foo : Foo
+>prop : any
+
+var x: symbol | Foo;
+>x : symbol | Foo
+>Foo : Foo
+
+x;
+>x : symbol | Foo
+
+if (typeof x === "object") {
+>typeof x === "object" : boolean
+>typeof x : string
+>x : symbol | Foo
+
+    x;
+>x : Foo
+}
+else {
+    x;
+>x : symbol | Foo
+}
diff --git a/tests/baselines/reference/symbolType19.js b/tests/baselines/reference/symbolType19.js
new file mode 100644
index 0000000000000..f3ba0e12472ff
--- /dev/null
+++ b/tests/baselines/reference/symbolType19.js
@@ -0,0 +1,24 @@
+//// [symbolType19.ts]
+enum E { }
+var x: symbol | E;
+
+x;
+if (typeof x === "number") {
+    x;
+}
+else {
+    x;
+}
+
+//// [symbolType19.js]
+var E;
+(function (E) {
+})(E || (E = {}));
+var x;
+x;
+if (typeof x === "number") {
+    x;
+}
+else {
+    x;
+}
diff --git a/tests/baselines/reference/symbolType19.types b/tests/baselines/reference/symbolType19.types
new file mode 100644
index 0000000000000..d01fbfa87fe98
--- /dev/null
+++ b/tests/baselines/reference/symbolType19.types
@@ -0,0 +1,23 @@
+=== tests/cases/conformance/es6/Symbols/symbolType19.ts ===
+enum E { }
+>E : E
+
+var x: symbol | E;
+>x : symbol | E
+>E : E
+
+x;
+>x : symbol | E
+
+if (typeof x === "number") {
+>typeof x === "number" : boolean
+>typeof x : string
+>x : symbol | E
+
+    x;
+>x : E
+}
+else {
+    x;
+>x : symbol
+}
diff --git a/tests/baselines/reference/symbolType2.errors.txt b/tests/baselines/reference/symbolType2.errors.txt
new file mode 100644
index 0000000000000..441db91771833
--- /dev/null
+++ b/tests/baselines/reference/symbolType2.errors.txt
@@ -0,0 +1,8 @@
+tests/cases/conformance/es6/Symbols/symbolType2.ts(2,7): error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType2.ts (1 errors) ====
+    Symbol.isConcatSpreadable in {};
+    "" in Symbol.toPrimitive;
+          ~~~~~~~~~~~~~~~~~~
+!!! error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType2.js b/tests/baselines/reference/symbolType2.js
new file mode 100644
index 0000000000000..e15e4da626e7e
--- /dev/null
+++ b/tests/baselines/reference/symbolType2.js
@@ -0,0 +1,7 @@
+//// [symbolType2.ts]
+Symbol.isConcatSpreadable in {};
+"" in Symbol.toPrimitive;
+
+//// [symbolType2.js]
+Symbol.isConcatSpreadable in {};
+"" in Symbol.toPrimitive;
diff --git a/tests/baselines/reference/symbolType20.errors.txt b/tests/baselines/reference/symbolType20.errors.txt
new file mode 100644
index 0000000000000..41345e371f8f2
--- /dev/null
+++ b/tests/baselines/reference/symbolType20.errors.txt
@@ -0,0 +1,7 @@
+tests/cases/conformance/es6/Symbols/symbolType20.ts(1,11): error TS2427: Interface name cannot be 'symbol'
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType20.ts (1 errors) ====
+    interface symbol { }
+              ~~~~~~
+!!! error TS2427: Interface name cannot be 'symbol'
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType20.js b/tests/baselines/reference/symbolType20.js
new file mode 100644
index 0000000000000..cf80d0d30acc9
--- /dev/null
+++ b/tests/baselines/reference/symbolType20.js
@@ -0,0 +1,4 @@
+//// [symbolType20.ts]
+interface symbol { }
+
+//// [symbolType20.js]
diff --git a/tests/baselines/reference/symbolType3.errors.txt b/tests/baselines/reference/symbolType3.errors.txt
new file mode 100644
index 0000000000000..7cc9e82b3b3da
--- /dev/null
+++ b/tests/baselines/reference/symbolType3.errors.txt
@@ -0,0 +1,33 @@
+tests/cases/conformance/es6/Symbols/symbolType3.ts(5,3): error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType3.ts(6,3): error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType3.ts(7,3): error TS2469: The '+' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType3.ts(8,3): error TS2469: The '-' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType3.ts(9,3): error TS2469: The '~' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType3.ts(12,2): error TS2469: The '+' operator cannot be applied to type 'symbol'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType3.ts (6 errors) ====
+    var s = Symbol();
+    delete Symbol.iterator;
+    void Symbol.toPrimitive;
+    typeof Symbol.toStringTag;
+    ++s;
+      ~
+!!! error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.
+    --s;
+      ~
+!!! error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.
+    + Symbol();
+      ~~~~~~~~
+!!! error TS2469: The '+' operator cannot be applied to type 'symbol'.
+    - Symbol();
+      ~~~~~~~~
+!!! error TS2469: The '-' operator cannot be applied to type 'symbol'.
+    ~ Symbol();
+      ~~~~~~~~
+!!! error TS2469: The '~' operator cannot be applied to type 'symbol'.
+    ! Symbol();
+    
+    +(Symbol() || 0);
+     ~~~~~~~~~~~~~~~
+!!! error TS2469: The '+' operator cannot be applied to type 'symbol'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType3.js b/tests/baselines/reference/symbolType3.js
new file mode 100644
index 0000000000000..4f599dacbe0a1
--- /dev/null
+++ b/tests/baselines/reference/symbolType3.js
@@ -0,0 +1,26 @@
+//// [symbolType3.ts]
+var s = Symbol();
+delete Symbol.iterator;
+void Symbol.toPrimitive;
+typeof Symbol.toStringTag;
+++s;
+--s;
++ Symbol();
+- Symbol();
+~ Symbol();
+! Symbol();
+
++(Symbol() || 0);
+
+//// [symbolType3.js]
+var s = Symbol();
+delete Symbol.iterator;
+void Symbol.toPrimitive;
+typeof Symbol.toStringTag;
+++s;
+--s;
++Symbol();
+-Symbol();
+~Symbol();
+!Symbol();
++(Symbol() || 0);
diff --git a/tests/baselines/reference/symbolType4.errors.txt b/tests/baselines/reference/symbolType4.errors.txt
new file mode 100644
index 0000000000000..210fe94b8d7f0
--- /dev/null
+++ b/tests/baselines/reference/symbolType4.errors.txt
@@ -0,0 +1,12 @@
+tests/cases/conformance/es6/Symbols/symbolType4.ts(2,1): error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType4.ts(3,1): error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType4.ts (2 errors) ====
+    var s = Symbol.for("postfix");
+    s++;
+    ~
+!!! error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.
+    s--;
+    ~
+!!! error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType4.js b/tests/baselines/reference/symbolType4.js
new file mode 100644
index 0000000000000..321de5a3bf9c0
--- /dev/null
+++ b/tests/baselines/reference/symbolType4.js
@@ -0,0 +1,9 @@
+//// [symbolType4.ts]
+var s = Symbol.for("postfix");
+s++;
+s--;
+
+//// [symbolType4.js]
+var s = Symbol.for("postfix");
+s++;
+s--;
diff --git a/tests/baselines/reference/symbolType5.errors.txt b/tests/baselines/reference/symbolType5.errors.txt
new file mode 100644
index 0000000000000..af70aad0f2690
--- /dev/null
+++ b/tests/baselines/reference/symbolType5.errors.txt
@@ -0,0 +1,34 @@
+tests/cases/conformance/es6/Symbols/symbolType5.ts(2,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType5.ts(2,5): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType5.ts(3,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType5.ts(3,5): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType5.ts(4,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType5.ts(4,5): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType5.ts(6,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType5.ts(7,5): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType5.ts (8 errors) ====
+    var s = Symbol.for("multiply");
+    s * s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+        ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s / s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+        ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s % s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+        ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    
+    s * 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    0 / s;
+        ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType5.js b/tests/baselines/reference/symbolType5.js
new file mode 100644
index 0000000000000..ce76e034bd95a
--- /dev/null
+++ b/tests/baselines/reference/symbolType5.js
@@ -0,0 +1,16 @@
+//// [symbolType5.ts]
+var s = Symbol.for("multiply");
+s * s;
+s / s;
+s % s;
+
+s * 0;
+0 / s;
+
+//// [symbolType5.js]
+var s = Symbol.for("multiply");
+s * s;
+s / s;
+s % s;
+s * 0;
+0 / s;
diff --git a/tests/baselines/reference/symbolType6.errors.txt b/tests/baselines/reference/symbolType6.errors.txt
new file mode 100644
index 0000000000000..29d894c2afb3f
--- /dev/null
+++ b/tests/baselines/reference/symbolType6.errors.txt
@@ -0,0 +1,57 @@
+tests/cases/conformance/es6/Symbols/symbolType6.ts(3,1): error TS2365: Operator '+' cannot be applied to types 'symbol' and 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(4,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(4,5): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(5,1): error TS2469: The '+' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(6,1): error TS2469: The '+' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(7,1): error TS2365: Operator '+' cannot be applied to types 'symbol' and 'number'.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(8,6): error TS2469: The '+' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(9,5): error TS2469: The '+' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(10,1): error TS2365: Operator '+' cannot be applied to types 'number' and 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(11,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(12,5): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(14,1): error TS2469: The '+' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType6.ts(15,6): error TS2469: The '+' operator cannot be applied to type 'symbol'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType6.ts (13 errors) ====
+    var s = Symbol.for("add");
+    var a: any;
+    s + s;
+    ~~~~~
+!!! error TS2365: Operator '+' cannot be applied to types 'symbol' and 'symbol'.
+    s - s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+        ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s + "";
+    ~
+!!! error TS2469: The '+' operator cannot be applied to type 'symbol'.
+    s + a;
+    ~
+!!! error TS2469: The '+' operator cannot be applied to type 'symbol'.
+    s + 0;
+    ~~~~~
+!!! error TS2365: Operator '+' cannot be applied to types 'symbol' and 'number'.
+    "" + s;
+         ~
+!!! error TS2469: The '+' operator cannot be applied to type 'symbol'.
+    a + s;
+        ~
+!!! error TS2469: The '+' operator cannot be applied to type 'symbol'.
+    0 + s;
+    ~~~~~
+!!! error TS2365: Operator '+' cannot be applied to types 'number' and 'symbol'.
+    s - 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    0 - s;
+        ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    
+    (s || "") + "";
+    ~~~~~~~~~
+!!! error TS2469: The '+' operator cannot be applied to type 'symbol'.
+    "" + (s || "");
+         ~~~~~~~~~
+!!! error TS2469: The '+' operator cannot be applied to type 'symbol'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType6.js b/tests/baselines/reference/symbolType6.js
new file mode 100644
index 0000000000000..b316f48cf0346
--- /dev/null
+++ b/tests/baselines/reference/symbolType6.js
@@ -0,0 +1,32 @@
+//// [symbolType6.ts]
+var s = Symbol.for("add");
+var a: any;
+s + s;
+s - s;
+s + "";
+s + a;
+s + 0;
+"" + s;
+a + s;
+0 + s;
+s - 0;
+0 - s;
+
+(s || "") + "";
+"" + (s || "");
+
+//// [symbolType6.js]
+var s = Symbol.for("add");
+var a;
+s + s;
+s - s;
+s + "";
+s + a;
+s + 0;
+"" + s;
+a + s;
+0 + s;
+s - 0;
+0 - s;
+(s || "") + "";
+"" + (s || "");
diff --git a/tests/baselines/reference/symbolType7.errors.txt b/tests/baselines/reference/symbolType7.errors.txt
new file mode 100644
index 0000000000000..80ecd2486ff74
--- /dev/null
+++ b/tests/baselines/reference/symbolType7.errors.txt
@@ -0,0 +1,37 @@
+tests/cases/conformance/es6/Symbols/symbolType7.ts(2,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType7.ts(2,6): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType7.ts(3,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType7.ts(4,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType7.ts(4,6): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType7.ts(5,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType7.ts(6,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType7.ts(6,7): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+tests/cases/conformance/es6/Symbols/symbolType7.ts(7,1): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType7.ts (9 errors) ====
+    var s = Symbol.for("shift");
+    s << s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+         ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s << 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s >> s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+         ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s >> 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s >>> s;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+          ~
+!!! error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
+    s >>> 0;
+    ~
+!!! error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType7.js b/tests/baselines/reference/symbolType7.js
new file mode 100644
index 0000000000000..47ace567a3d73
--- /dev/null
+++ b/tests/baselines/reference/symbolType7.js
@@ -0,0 +1,17 @@
+//// [symbolType7.ts]
+var s = Symbol.for("shift");
+s << s;
+s << 0;
+s >> s;
+s >> 0;
+s >>> s;
+s >>> 0;
+
+//// [symbolType7.js]
+var s = Symbol.for("shift");
+s << s;
+s << 0;
+s >> s;
+s >> 0;
+s >>> s;
+s >>> 0;
diff --git a/tests/baselines/reference/symbolType8.errors.txt b/tests/baselines/reference/symbolType8.errors.txt
new file mode 100644
index 0000000000000..8df7db61feb5b
--- /dev/null
+++ b/tests/baselines/reference/symbolType8.errors.txt
@@ -0,0 +1,45 @@
+tests/cases/conformance/es6/Symbols/symbolType8.ts(2,1): error TS2469: The '<' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType8.ts(3,1): error TS2469: The '<' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType8.ts(4,1): error TS2469: The '>' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType8.ts(5,1): error TS2469: The '>' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType8.ts(6,1): error TS2469: The '<=' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType8.ts(7,1): error TS2469: The '<=' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType8.ts(8,1): error TS2469: The '>=' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType8.ts(9,1): error TS2469: The '>=' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType8.ts(11,6): error TS2469: The '>=' operator cannot be applied to type 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType8.ts(12,1): error TS2469: The '>=' operator cannot be applied to type 'symbol'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType8.ts (10 errors) ====
+    var s = Symbol.for("compare");
+    s < s;
+    ~
+!!! error TS2469: The '<' operator cannot be applied to type 'symbol'.
+    s < 0;
+    ~
+!!! error TS2469: The '<' operator cannot be applied to type 'symbol'.
+    s > s;
+    ~
+!!! error TS2469: The '>' operator cannot be applied to type 'symbol'.
+    s > 0;
+    ~
+!!! error TS2469: The '>' operator cannot be applied to type 'symbol'.
+    s <= s;
+    ~
+!!! error TS2469: The '<=' operator cannot be applied to type 'symbol'.
+    s <= 0;
+    ~
+!!! error TS2469: The '<=' operator cannot be applied to type 'symbol'.
+    s >= s;
+    ~
+!!! error TS2469: The '>=' operator cannot be applied to type 'symbol'.
+    s >= 0;
+    ~
+!!! error TS2469: The '>=' operator cannot be applied to type 'symbol'.
+    
+    0 >= (s || 0);
+         ~~~~~~~~
+!!! error TS2469: The '>=' operator cannot be applied to type 'symbol'.
+    (s || 0) >= s;
+    ~~~~~~~~
+!!! error TS2469: The '>=' operator cannot be applied to type 'symbol'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType8.js b/tests/baselines/reference/symbolType8.js
new file mode 100644
index 0000000000000..7e56416ca841d
--- /dev/null
+++ b/tests/baselines/reference/symbolType8.js
@@ -0,0 +1,26 @@
+//// [symbolType8.ts]
+var s = Symbol.for("compare");
+s < s;
+s < 0;
+s > s;
+s > 0;
+s <= s;
+s <= 0;
+s >= s;
+s >= 0;
+
+0 >= (s || 0);
+(s || 0) >= s;
+
+//// [symbolType8.js]
+var s = Symbol.for("compare");
+s < s;
+s < 0;
+s > s;
+s > 0;
+s <= s;
+s <= 0;
+s >= s;
+s >= 0;
+0 >= (s || 0);
+(s || 0) >= s;
diff --git a/tests/baselines/reference/symbolType9.errors.txt b/tests/baselines/reference/symbolType9.errors.txt
new file mode 100644
index 0000000000000..5506fdc6f9dac
--- /dev/null
+++ b/tests/baselines/reference/symbolType9.errors.txt
@@ -0,0 +1,24 @@
+tests/cases/conformance/es6/Symbols/symbolType9.ts(3,1): error TS2365: Operator '==' cannot be applied to types 'symbol' and 'boolean'.
+tests/cases/conformance/es6/Symbols/symbolType9.ts(5,1): error TS2365: Operator '!=' cannot be applied to types 'number' and 'symbol'.
+tests/cases/conformance/es6/Symbols/symbolType9.ts(7,1): error TS2365: Operator '===' cannot be applied to types 'symbol' and 'number'.
+tests/cases/conformance/es6/Symbols/symbolType9.ts(9,1): error TS2365: Operator '!==' cannot be applied to types 'boolean' and 'symbol'.
+
+
+==== tests/cases/conformance/es6/Symbols/symbolType9.ts (4 errors) ====
+    var s = Symbol.for("equal");
+    s == s;
+    s == true;
+    ~~~~~~~~~
+!!! error TS2365: Operator '==' cannot be applied to types 'symbol' and 'boolean'.
+    s != s;
+    0 != s;
+    ~~~~~~
+!!! error TS2365: Operator '!=' cannot be applied to types 'number' and 'symbol'.
+    s === s;
+    s === 1;
+    ~~~~~~~
+!!! error TS2365: Operator '===' cannot be applied to types 'symbol' and 'number'.
+    s !== s;
+    false !== s;
+    ~~~~~~~~~~~
+!!! error TS2365: Operator '!==' cannot be applied to types 'boolean' and 'symbol'.
\ No newline at end of file
diff --git a/tests/baselines/reference/symbolType9.js b/tests/baselines/reference/symbolType9.js
new file mode 100644
index 0000000000000..c9b0c801cc830
--- /dev/null
+++ b/tests/baselines/reference/symbolType9.js
@@ -0,0 +1,21 @@
+//// [symbolType9.ts]
+var s = Symbol.for("equal");
+s == s;
+s == true;
+s != s;
+0 != s;
+s === s;
+s === 1;
+s !== s;
+false !== s;
+
+//// [symbolType9.js]
+var s = Symbol.for("equal");
+s == s;
+s == true;
+s != s;
+0 != s;
+s === s;
+s === 1;
+s !== s;
+false !== s;
diff --git a/tests/baselines/reference/widenedTypes.errors.txt b/tests/baselines/reference/widenedTypes.errors.txt
index 7374bd23b7799..2277ef6eea75a 100644
--- a/tests/baselines/reference/widenedTypes.errors.txt
+++ b/tests/baselines/reference/widenedTypes.errors.txt
@@ -1,5 +1,5 @@
 tests/cases/compiler/widenedTypes.ts(2,1): error TS2358: The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter.
-tests/cases/compiler/widenedTypes.ts(5,1): error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+tests/cases/compiler/widenedTypes.ts(5,1): error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
 tests/cases/compiler/widenedTypes.ts(6,7): error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
 tests/cases/compiler/widenedTypes.ts(8,15): error TS2407: The right-hand side of a 'for...in' statement must be of type 'any', an object type or a type parameter.
 tests/cases/compiler/widenedTypes.ts(11,1): error TS2322: Type 'string' is not assignable to type 'number'.
@@ -20,7 +20,7 @@ tests/cases/compiler/widenedTypes.ts(24,5): error TS2322: Type '{ [x: string]: n
     
     null in {};
     ~~~~
-!!! error TS2360: The left-hand side of an 'in' expression must be of types 'any', 'string' or 'number'.
+!!! error TS2360: The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.
     "" in null;
           ~~~~
 !!! error TS2361: The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter
diff --git a/tests/cases/conformance/Symbols/ES5SymbolProperty1.ts b/tests/cases/conformance/Symbols/ES5SymbolProperty1.ts
new file mode 100644
index 0000000000000..8a9276416c5e4
--- /dev/null
+++ b/tests/cases/conformance/Symbols/ES5SymbolProperty1.ts
@@ -0,0 +1,11 @@
+//@target: ES5
+interface SymbolConstructor {
+    foo: string;
+}
+var Symbol: SymbolConstructor;
+
+var obj = {
+    [Symbol.foo]: 0
+}
+
+obj[Symbol.foo];
\ No newline at end of file
diff --git a/tests/cases/conformance/Symbols/ES5SymbolProperty2.ts b/tests/cases/conformance/Symbols/ES5SymbolProperty2.ts
new file mode 100644
index 0000000000000..07c95eb27d99e
--- /dev/null
+++ b/tests/cases/conformance/Symbols/ES5SymbolProperty2.ts
@@ -0,0 +1,11 @@
+//@target: ES5
+module M {
+    var Symbol;
+
+    export class C {
+        [Symbol.iterator]() { }
+    }
+    (new C)[Symbol.iterator];
+}
+
+(new M.C)[Symbol.iterator];
\ No newline at end of file
diff --git a/tests/cases/conformance/Symbols/ES5SymbolProperty3.ts b/tests/cases/conformance/Symbols/ES5SymbolProperty3.ts
new file mode 100644
index 0000000000000..262e47557f8b9
--- /dev/null
+++ b/tests/cases/conformance/Symbols/ES5SymbolProperty3.ts
@@ -0,0 +1,8 @@
+//@target: ES5
+var Symbol;
+
+class C {
+    [Symbol.iterator]() { }
+}
+
+(new C)[Symbol.iterator]
\ No newline at end of file
diff --git a/tests/cases/conformance/Symbols/ES5SymbolProperty4.ts b/tests/cases/conformance/Symbols/ES5SymbolProperty4.ts
new file mode 100644
index 0000000000000..2b14e64a33ced
--- /dev/null
+++ b/tests/cases/conformance/Symbols/ES5SymbolProperty4.ts
@@ -0,0 +1,8 @@
+//@target: ES5
+var Symbol: { iterator: string };
+
+class C {
+    [Symbol.iterator]() { }
+}
+
+(new C)[Symbol.iterator]
\ No newline at end of file
diff --git a/tests/cases/conformance/Symbols/ES5SymbolProperty5.ts b/tests/cases/conformance/Symbols/ES5SymbolProperty5.ts
new file mode 100644
index 0000000000000..ec46ddad21dc1
--- /dev/null
+++ b/tests/cases/conformance/Symbols/ES5SymbolProperty5.ts
@@ -0,0 +1,8 @@
+//@target: ES5
+var Symbol: { iterator: symbol };
+
+class C {
+    [Symbol.iterator]() { }
+}
+
+(new C)[Symbol.iterator](0) // Should error
\ No newline at end of file
diff --git a/tests/cases/conformance/Symbols/ES5SymbolProperty6.ts b/tests/cases/conformance/Symbols/ES5SymbolProperty6.ts
new file mode 100644
index 0000000000000..59b7d2291aada
--- /dev/null
+++ b/tests/cases/conformance/Symbols/ES5SymbolProperty6.ts
@@ -0,0 +1,6 @@
+//@target: ES5
+class C {
+    [Symbol.iterator]() { }
+}
+
+(new C)[Symbol.iterator]
\ No newline at end of file
diff --git a/tests/cases/conformance/Symbols/ES5SymbolProperty7.ts b/tests/cases/conformance/Symbols/ES5SymbolProperty7.ts
new file mode 100644
index 0000000000000..766b86f9b5d33
--- /dev/null
+++ b/tests/cases/conformance/Symbols/ES5SymbolProperty7.ts
@@ -0,0 +1,8 @@
+//@target: ES5
+var Symbol: { iterator: any };
+
+class C {
+    [Symbol.iterator]() { }
+}
+
+(new C)[Symbol.iterator]
\ No newline at end of file
diff --git a/tests/cases/conformance/Symbols/ES5SymbolType1.ts b/tests/cases/conformance/Symbols/ES5SymbolType1.ts
new file mode 100644
index 0000000000000..bfd5592f8e4c2
--- /dev/null
+++ b/tests/cases/conformance/Symbols/ES5SymbolType1.ts
@@ -0,0 +1,3 @@
+//@target: ES5
+var s: symbol;
+s.toString();
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit1.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit1.ts
new file mode 100644
index 0000000000000..b99806a1eee23
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit1.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+//@declaration: true
+class C {
+    [Symbol.isRegExp]: number;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit10.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit10.ts
new file mode 100644
index 0000000000000..cf3496c2553e2
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit10.ts
@@ -0,0 +1,6 @@
+//@target: ES6
+//@declaration: true
+var obj = {
+    get [Symbol.isConcatSpreadable]() { return '' },
+    set [Symbol.isConcatSpreadable](x) { }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit11.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit11.ts
new file mode 100644
index 0000000000000..4b88ab559804a
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit11.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+//@declaration: true
+class C {
+    static [Symbol.iterator] = 0;
+    static [Symbol.toPrimitive]() { }
+    static get [Symbol.isRegExp]() { return ""; }
+    static set [Symbol.isRegExp](x) { }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit12.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit12.ts
new file mode 100644
index 0000000000000..c18b470d35de3
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit12.ts
@@ -0,0 +1,14 @@
+//@target: ES6
+//@declaration: true
+module M {
+    interface I { }
+    export class C {
+        [Symbol.iterator]: I;
+        [Symbol.toPrimitive](x: I) { }
+        [Symbol.isConcatSpreadable](): I {
+            return undefined
+        }
+        get [Symbol.isRegExp]() { return undefined; }
+        set [Symbol.isRegExp](x: I) { }
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit13.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit13.ts
new file mode 100644
index 0000000000000..18568e853e834
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit13.ts
@@ -0,0 +1,6 @@
+//@target: ES6
+//@declaration: true
+class C {
+    get [Symbol.isRegExp]() { return ""; }
+    set [Symbol.toStringTag](x) { }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit14.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit14.ts
new file mode 100644
index 0000000000000..312476628b88d
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit14.ts
@@ -0,0 +1,6 @@
+//@target: ES6
+//@declaration: true
+class C {
+    get [Symbol.isRegExp]() { return ""; }
+    get [Symbol.toStringTag]() { return ""; }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit2.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit2.ts
new file mode 100644
index 0000000000000..420e1c849060d
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit2.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+//@declaration: true
+class C {
+    [Symbol.isRegExp] = "";
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit3.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit3.ts
new file mode 100644
index 0000000000000..b70ee3c15acf8
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit3.ts
@@ -0,0 +1,7 @@
+//@target: ES6
+//@declaration: true
+class C {
+    [Symbol.isRegExp](x: number);
+    [Symbol.isRegExp](x: string);
+    [Symbol.isRegExp](x: any) { }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit4.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit4.ts
new file mode 100644
index 0000000000000..dde80577fa49a
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit4.ts
@@ -0,0 +1,6 @@
+//@target: ES6
+//@declaration: true
+class C {
+    get [Symbol.isRegExp]() { return ""; }
+    set [Symbol.isRegExp](x) { }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit5.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit5.ts
new file mode 100644
index 0000000000000..e5acf9c9f7c67
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit5.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+//@declaration: true
+interface I {
+    [Symbol.isConcatSpreadable](): string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit6.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit6.ts
new file mode 100644
index 0000000000000..1d0059f954f5d
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit6.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+//@declaration: true
+interface I {
+    [Symbol.isConcatSpreadable]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit7.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit7.ts
new file mode 100644
index 0000000000000..01f91681b1591
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit7.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+//@declaration: true
+var obj: {
+    [Symbol.isConcatSpreadable]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit8.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit8.ts
new file mode 100644
index 0000000000000..2682a4940f986
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit8.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+//@declaration: true
+var obj = {
+    [Symbol.isConcatSpreadable]: 0
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit9.ts b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit9.ts
new file mode 100644
index 0000000000000..2c35a55360052
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolDeclarationEmit9.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+//@declaration: true
+var obj = {
+    [Symbol.isConcatSpreadable]() { }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty1.ts b/tests/cases/conformance/es6/Symbols/symbolProperty1.ts
new file mode 100644
index 0000000000000..0e008511be3fe
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty1.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+var s: symbol;
+var x = {
+    [s]: 0,
+    [s]() { },
+    get [s]() {
+        return 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty10.ts b/tests/cases/conformance/es6/Symbols/symbolProperty10.ts
new file mode 100644
index 0000000000000..0f63356eaf686
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty10.ts
@@ -0,0 +1,11 @@
+//@target: ES6
+class C {
+    [Symbol.iterator]: { x; y };
+}
+interface I {
+    [Symbol.iterator]?: { x };
+}
+
+var i: I;
+i = new C;
+var c: C = i;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty11.ts b/tests/cases/conformance/es6/Symbols/symbolProperty11.ts
new file mode 100644
index 0000000000000..1377970613ddf
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty11.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+class C { }
+interface I {
+    [Symbol.iterator]?: { x };
+}
+
+var i: I;
+i = new C;
+var c: C = i;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty12.ts b/tests/cases/conformance/es6/Symbols/symbolProperty12.ts
new file mode 100644
index 0000000000000..5a835a34b629f
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty12.ts
@@ -0,0 +1,11 @@
+//@target: ES6
+class C {
+    private [Symbol.iterator]: { x };
+}
+interface I {
+    [Symbol.iterator]: { x };
+}
+
+var i: I;
+i = new C;
+var c: C = i;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty13.ts b/tests/cases/conformance/es6/Symbols/symbolProperty13.ts
new file mode 100644
index 0000000000000..4b5023e1d0655
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty13.ts
@@ -0,0 +1,17 @@
+//@target: ES6
+class C {
+    [Symbol.iterator]: { x; y };
+}
+interface I {
+    [Symbol.iterator]: { x };
+}
+
+declare function foo(i: I): I;
+declare function foo(a: any): any;
+
+declare function bar(i: C): C;
+declare function bar(a: any): any;
+
+foo(new C);
+var i: I;
+bar(i);
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty14.ts b/tests/cases/conformance/es6/Symbols/symbolProperty14.ts
new file mode 100644
index 0000000000000..0109ec3be251e
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty14.ts
@@ -0,0 +1,17 @@
+//@target: ES6
+class C {
+    [Symbol.iterator]: { x; y };
+}
+interface I {
+    [Symbol.iterator]?: { x };
+}
+
+declare function foo(i: I): I;
+declare function foo(a: any): any;
+
+declare function bar(i: C): C;
+declare function bar(a: any): any;
+
+foo(new C);
+var i: I;
+bar(i);
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty15.ts b/tests/cases/conformance/es6/Symbols/symbolProperty15.ts
new file mode 100644
index 0000000000000..3ec6c6ecc7a9a
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty15.ts
@@ -0,0 +1,15 @@
+//@target: ES6
+class C { }
+interface I {
+    [Symbol.iterator]?: { x };
+}
+
+declare function foo(i: I): I;
+declare function foo(a: any): any;
+
+declare function bar(i: C): C;
+declare function bar(a: any): any;
+
+foo(new C);
+var i: I;
+bar(i);
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty16.ts b/tests/cases/conformance/es6/Symbols/symbolProperty16.ts
new file mode 100644
index 0000000000000..2b3a976df9883
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty16.ts
@@ -0,0 +1,17 @@
+//@target: ES6
+class C {
+    private [Symbol.iterator]: { x };
+}
+interface I {
+    [Symbol.iterator]: { x };
+}
+
+declare function foo(i: I): I;
+declare function foo(a: any): any;
+
+declare function bar(i: C): C;
+declare function bar(a: any): any;
+
+foo(new C);
+var i: I;
+bar(i);
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty17.ts b/tests/cases/conformance/es6/Symbols/symbolProperty17.ts
new file mode 100644
index 0000000000000..737059d0e3bcf
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty17.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+interface I {
+    [Symbol.iterator]: number;
+    [s: symbol]: string;
+    "__@iterator": string;
+}
+
+var i: I;
+var it = i[Symbol.iterator];
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty18.ts b/tests/cases/conformance/es6/Symbols/symbolProperty18.ts
new file mode 100644
index 0000000000000..2fabea34960f0
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty18.ts
@@ -0,0 +1,10 @@
+//@target: ES6
+var i = {
+    [Symbol.iterator]: 0,
+    [Symbol.toStringTag]() { return "" },
+    set [Symbol.toPrimitive](p: boolean) { }
+}
+
+var it = i[Symbol.iterator];
+var str = i[Symbol.toStringTag]();
+i[Symbol.toPrimitive] = false;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty19.ts b/tests/cases/conformance/es6/Symbols/symbolProperty19.ts
new file mode 100644
index 0000000000000..df9b99f5ca427
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty19.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+var i = {
+    [Symbol.iterator]: { p: null },
+    [Symbol.toStringTag]() { return { p: undefined }; }
+}
+
+var it = i[Symbol.iterator];
+var str = i[Symbol.toStringTag]();
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty2.ts b/tests/cases/conformance/es6/Symbols/symbolProperty2.ts
new file mode 100644
index 0000000000000..44a2ba1387464
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty2.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+var s = Symbol();
+var x = {
+    [s]: 0,
+    [s]() { },
+    get [s]() {
+        return 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty20.ts b/tests/cases/conformance/es6/Symbols/symbolProperty20.ts
new file mode 100644
index 0000000000000..7180ceec87dbe
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty20.ts
@@ -0,0 +1,10 @@
+//@target: ES6
+interface I {
+    [Symbol.iterator]: (s: string) => string;
+    [Symbol.toStringTag](s: number): number;
+}
+
+var i: I = {
+    [Symbol.iterator]: s => s,
+    [Symbol.toStringTag](n) { return n; }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty21.ts b/tests/cases/conformance/es6/Symbols/symbolProperty21.ts
new file mode 100644
index 0000000000000..52e84a004254a
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty21.ts
@@ -0,0 +1,13 @@
+//@target: ES6
+interface I<T, U> {
+    [Symbol.unscopables]: T;
+    [Symbol.isConcatSpreadable]: U;
+}
+
+declare function foo<T, U>(p: I<T, U>): { t: T; u: U };
+
+foo({
+    [Symbol.isConcatSpreadable]: "",
+    [Symbol.isRegExp]: 0,
+    [Symbol.unscopables]: true
+});
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty22.ts b/tests/cases/conformance/es6/Symbols/symbolProperty22.ts
new file mode 100644
index 0000000000000..a0eec6dd471ae
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty22.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+interface I<T, U> {
+    [Symbol.unscopables](x: T): U;
+}
+
+declare function foo<T, U>(p1: T, p2: I<T, U>): U;
+
+foo("", { [Symbol.unscopables]: s => s.length });
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty23.ts b/tests/cases/conformance/es6/Symbols/symbolProperty23.ts
new file mode 100644
index 0000000000000..6d8a210872032
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty23.ts
@@ -0,0 +1,10 @@
+//@target: ES6
+interface I {
+    [Symbol.toPrimitive]: () => boolean;
+}
+
+class C implements I {
+    [Symbol.toPrimitive]() {
+        return true;
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty24.ts b/tests/cases/conformance/es6/Symbols/symbolProperty24.ts
new file mode 100644
index 0000000000000..8e1c35879ab5e
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty24.ts
@@ -0,0 +1,10 @@
+//@target: ES6
+interface I {
+    [Symbol.toPrimitive]: () => boolean;
+}
+
+class C implements I {
+    [Symbol.toPrimitive]() {
+        return "";
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty25.ts b/tests/cases/conformance/es6/Symbols/symbolProperty25.ts
new file mode 100644
index 0000000000000..ee5711749333c
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty25.ts
@@ -0,0 +1,10 @@
+//@target: ES6
+interface I {
+    [Symbol.toPrimitive]: () => boolean;
+}
+
+class C implements I {
+    [Symbol.toStringTag]() {
+        return "";
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty26.ts b/tests/cases/conformance/es6/Symbols/symbolProperty26.ts
new file mode 100644
index 0000000000000..88b7d168d648f
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty26.ts
@@ -0,0 +1,12 @@
+//@target: ES6
+class C1 {
+    [Symbol.toStringTag]() {
+        return "";
+    }
+}
+
+class C2 extends C1 {
+    [Symbol.toStringTag]() {
+        return "";
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty27.ts b/tests/cases/conformance/es6/Symbols/symbolProperty27.ts
new file mode 100644
index 0000000000000..c6283595575e1
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty27.ts
@@ -0,0 +1,12 @@
+//@target: ES6
+class C1 {
+    [Symbol.toStringTag]() {
+        return {};
+    }
+}
+
+class C2 extends C1 {
+    [Symbol.toStringTag]() {
+        return "";
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty28.ts b/tests/cases/conformance/es6/Symbols/symbolProperty28.ts
new file mode 100644
index 0000000000000..7f68444a75e7c
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty28.ts
@@ -0,0 +1,11 @@
+//@target: ES6
+class C1 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+}
+
+class C2 extends C1 { }
+
+var c: C2;
+var obj = c[Symbol.toStringTag]().x;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty29.ts b/tests/cases/conformance/es6/Symbols/symbolProperty29.ts
new file mode 100644
index 0000000000000..8d1b8491d3792
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty29.ts
@@ -0,0 +1,7 @@
+//@target: ES6
+class C1 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+    [s: symbol]: () => { x: string };
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty3.ts b/tests/cases/conformance/es6/Symbols/symbolProperty3.ts
new file mode 100644
index 0000000000000..027e93a86adfb
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty3.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+var s = Symbol;
+var x = {
+    [s]: 0,
+    [s]() { },
+    get [s]() {
+        return 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty30.ts b/tests/cases/conformance/es6/Symbols/symbolProperty30.ts
new file mode 100644
index 0000000000000..a75f77d6056a2
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty30.ts
@@ -0,0 +1,7 @@
+//@target: ES6
+class C1 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+    [s: symbol]: () => { x: number };
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty31.ts b/tests/cases/conformance/es6/Symbols/symbolProperty31.ts
new file mode 100644
index 0000000000000..d41f5d6b0fe48
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty31.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+class C1 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+}
+class C2 extends C1 {
+    [s: symbol]: () => { x: string };
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty32.ts b/tests/cases/conformance/es6/Symbols/symbolProperty32.ts
new file mode 100644
index 0000000000000..52da68fc57c58
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty32.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+class C1 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+}
+class C2 extends C1 {
+    [s: symbol]: () => { x: number };
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty33.ts b/tests/cases/conformance/es6/Symbols/symbolProperty33.ts
new file mode 100644
index 0000000000000..8c7a4d274f329
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty33.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+class C1 extends C2 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+}
+class C2 {
+    [s: symbol]: () => { x: string };
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty34.ts b/tests/cases/conformance/es6/Symbols/symbolProperty34.ts
new file mode 100644
index 0000000000000..6e8bb521f0a79
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty34.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+class C1 extends C2 {
+    [Symbol.toStringTag]() {
+        return { x: "" };
+    }
+}
+class C2 {
+    [s: symbol]: () => { x: number };
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty35.ts b/tests/cases/conformance/es6/Symbols/symbolProperty35.ts
new file mode 100644
index 0000000000000..2d9527e2fd46b
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty35.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+interface I1 {
+    [Symbol.toStringTag](): { x: string }
+}
+interface I2 {
+    [Symbol.toStringTag](): { x: number }
+}
+
+interface I3 extends I1, I2 { }
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty36.ts b/tests/cases/conformance/es6/Symbols/symbolProperty36.ts
new file mode 100644
index 0000000000000..709ea39cd5dfa
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty36.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+var x = {
+    [Symbol.isConcatSpreadable]: 0,
+    [Symbol.isConcatSpreadable]: 1
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty37.ts b/tests/cases/conformance/es6/Symbols/symbolProperty37.ts
new file mode 100644
index 0000000000000..7a6c86a7beaa8
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty37.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+interface I {
+    [Symbol.isConcatSpreadable]: string;
+    [Symbol.isConcatSpreadable]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty38.ts b/tests/cases/conformance/es6/Symbols/symbolProperty38.ts
new file mode 100644
index 0000000000000..c8683344edcc9
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty38.ts
@@ -0,0 +1,7 @@
+//@target: ES6
+interface I {
+    [Symbol.isConcatSpreadable]: string;
+}
+interface I {
+    [Symbol.isConcatSpreadable]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty39.ts b/tests/cases/conformance/es6/Symbols/symbolProperty39.ts
new file mode 100644
index 0000000000000..af3a95eb155ab
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty39.ts
@@ -0,0 +1,11 @@
+//@target: ES6
+class C {
+    [Symbol.iterator](x: string): string;
+    [Symbol.iterator](x: number): number;
+    [Symbol.iterator](x: any) {
+        return undefined;
+    }
+    [Symbol.iterator](x: any) {
+        return undefined;
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty4.ts b/tests/cases/conformance/es6/Symbols/symbolProperty4.ts
new file mode 100644
index 0000000000000..b6079bb31b350
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty4.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+var x = {
+    [Symbol()]: 0,
+    [Symbol()]() { },
+    get [Symbol()]() {
+        return 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty40.ts b/tests/cases/conformance/es6/Symbols/symbolProperty40.ts
new file mode 100644
index 0000000000000..91fd953a4d77a
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty40.ts
@@ -0,0 +1,12 @@
+//@target: ES6
+class C {
+    [Symbol.iterator](x: string): string;
+    [Symbol.iterator](x: number): number;
+    [Symbol.iterator](x: any) {
+        return undefined;
+    }
+}
+
+var c = new C;
+c[Symbol.iterator]("");
+c[Symbol.iterator](0);
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty41.ts b/tests/cases/conformance/es6/Symbols/symbolProperty41.ts
new file mode 100644
index 0000000000000..9c9583264cd7f
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty41.ts
@@ -0,0 +1,12 @@
+//@target: ES6
+class C {
+    [Symbol.iterator](x: string): { x: string };
+    [Symbol.iterator](x: "hello"): { x: string; hello: string };
+    [Symbol.iterator](x: any) {
+        return undefined;
+    }
+}
+
+var c = new C;
+c[Symbol.iterator]("");
+c[Symbol.iterator]("hello");
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty42.ts b/tests/cases/conformance/es6/Symbols/symbolProperty42.ts
new file mode 100644
index 0000000000000..79fbce7bb90cd
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty42.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+class C {
+    [Symbol.iterator](x: string): string;
+    static [Symbol.iterator](x: number): number;
+    [Symbol.iterator](x: any) {
+        return undefined;
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty43.ts b/tests/cases/conformance/es6/Symbols/symbolProperty43.ts
new file mode 100644
index 0000000000000..c524b6423a537
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty43.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+class C {
+    [Symbol.iterator](x: string): string;
+    [Symbol.iterator](x: number): number;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty44.ts b/tests/cases/conformance/es6/Symbols/symbolProperty44.ts
new file mode 100644
index 0000000000000..a6281592605d6
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty44.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+class C {
+    get [Symbol.hasInstance]() {
+        return "";
+    }
+    get [Symbol.hasInstance]() {
+        return "";
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty45.ts b/tests/cases/conformance/es6/Symbols/symbolProperty45.ts
new file mode 100644
index 0000000000000..cfdcc31764608
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty45.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+class C {
+    get [Symbol.hasInstance]() {
+        return "";
+    }
+    get [Symbol.toPrimitive]() {
+        return "";
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty46.ts b/tests/cases/conformance/es6/Symbols/symbolProperty46.ts
new file mode 100644
index 0000000000000..84ce050ac1c48
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty46.ts
@@ -0,0 +1,12 @@
+//@target: ES6
+class C {
+    get [Symbol.hasInstance]() {
+        return "";
+    }
+    // Should take a string
+    set [Symbol.hasInstance](x) {
+    }
+}
+
+(new C)[Symbol.hasInstance] = 0;
+(new C)[Symbol.hasInstance] = "";
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty47.ts b/tests/cases/conformance/es6/Symbols/symbolProperty47.ts
new file mode 100644
index 0000000000000..05e46aaee75c0
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty47.ts
@@ -0,0 +1,12 @@
+//@target: ES6
+class C {
+    get [Symbol.hasInstance]() {
+        return "";
+    }
+    // Should take a string
+    set [Symbol.hasInstance](x: number) {
+    }
+}
+
+(new C)[Symbol.hasInstance] = 0;
+(new C)[Symbol.hasInstance] = "";
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty48.ts b/tests/cases/conformance/es6/Symbols/symbolProperty48.ts
new file mode 100644
index 0000000000000..77ce9303b4425
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty48.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+module M {
+    var Symbol;
+
+    class C {
+        [Symbol.iterator]() { }
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty49.ts b/tests/cases/conformance/es6/Symbols/symbolProperty49.ts
new file mode 100644
index 0000000000000..bc34e146f2c2e
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty49.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+module M {
+    export var Symbol;
+
+    class C {
+        [Symbol.iterator]() { }
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty5.ts b/tests/cases/conformance/es6/Symbols/symbolProperty5.ts
new file mode 100644
index 0000000000000..84cb12a9de818
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty5.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+var x = {
+    [Symbol.iterator]: 0,
+    [Symbol.isRegExp]() { },
+    get [Symbol.toStringTag]() {
+        return 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty50.ts b/tests/cases/conformance/es6/Symbols/symbolProperty50.ts
new file mode 100644
index 0000000000000..8bcf25fab2906
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty50.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+module M {
+    interface Symbol { }
+
+    class C {
+        [Symbol.iterator]() { }
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty51.ts b/tests/cases/conformance/es6/Symbols/symbolProperty51.ts
new file mode 100644
index 0000000000000..3da5d45bf8403
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty51.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+module M {
+    module Symbol { }
+
+    class C {
+        [Symbol.iterator]() { }
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty52.ts b/tests/cases/conformance/es6/Symbols/symbolProperty52.ts
new file mode 100644
index 0000000000000..b14838a6914b4
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty52.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+var obj = {
+    [Symbol.nonsense]: 0
+};
+
+obj = {};
+
+obj[Symbol.nonsense];
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty53.ts b/tests/cases/conformance/es6/Symbols/symbolProperty53.ts
new file mode 100644
index 0000000000000..c58b6e885afcc
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty53.ts
@@ -0,0 +1,6 @@
+//@target: ES6
+var obj = {
+    [Symbol.for]: 0
+};
+
+obj[Symbol.for];
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty54.ts b/tests/cases/conformance/es6/Symbols/symbolProperty54.ts
new file mode 100644
index 0000000000000..b3eab2a54a154
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty54.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+var obj = {
+    [Symbol.prototype]: 0
+};
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty55.ts b/tests/cases/conformance/es6/Symbols/symbolProperty55.ts
new file mode 100644
index 0000000000000..3c6ceb69b0e44
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty55.ts
@@ -0,0 +1,11 @@
+//@target: ES6
+var obj = {
+    [Symbol.iterator]: 0
+};
+
+module M {
+    var Symbol: SymbolConstructor;
+    // The following should be of type 'any'. This is because even though obj has a property keyed by Symbol.iterator,
+    // the key passed in here is the *wrong* Symbol.iterator. It is not the iterator property of the global Symbol.
+    obj[Symbol.iterator];
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty56.ts b/tests/cases/conformance/es6/Symbols/symbolProperty56.ts
new file mode 100644
index 0000000000000..ae9e5232b9bd4
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty56.ts
@@ -0,0 +1,11 @@
+//@target: ES6
+var obj = {
+    [Symbol.iterator]: 0
+};
+
+module M {
+    var Symbol: {};
+    // The following should be of type 'any'. This is because even though obj has a property keyed by Symbol.iterator,
+    // the key passed in here is the *wrong* Symbol.iterator. It is not the iterator property of the global Symbol.
+    obj[Symbol["iterator"]];
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty57.ts b/tests/cases/conformance/es6/Symbols/symbolProperty57.ts
new file mode 100644
index 0000000000000..b60c18a05ee47
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty57.ts
@@ -0,0 +1,7 @@
+//@target: ES6
+var obj = {
+    [Symbol.iterator]: 0
+};
+
+// Should give type 'any'.
+obj[Symbol["nonsense"]];
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty58.ts b/tests/cases/conformance/es6/Symbols/symbolProperty58.ts
new file mode 100644
index 0000000000000..48cc6eb90f32c
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty58.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+interface SymbolConstructor {
+    foo: string;
+}
+
+var obj = {
+    [Symbol.foo]: 0
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty59.ts b/tests/cases/conformance/es6/Symbols/symbolProperty59.ts
new file mode 100644
index 0000000000000..bdea9dab62c28
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty59.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+interface I {
+    [Symbol.keyFor]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty6.ts b/tests/cases/conformance/es6/Symbols/symbolProperty6.ts
new file mode 100644
index 0000000000000..ff17b977c3898
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty6.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+class C {
+    [Symbol.iterator] = 0;
+    [Symbol.unscopables]: number;
+    [Symbol.isRegExp]() { }
+    get [Symbol.toStringTag]() {
+        return 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty7.ts b/tests/cases/conformance/es6/Symbols/symbolProperty7.ts
new file mode 100644
index 0000000000000..972e96c282b34
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty7.ts
@@ -0,0 +1,9 @@
+//@target: ES6
+class C {
+    [Symbol()] = 0;
+    [Symbol()]: number;
+    [Symbol()]() { }
+    get [Symbol()]() {
+        return 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty8.ts b/tests/cases/conformance/es6/Symbols/symbolProperty8.ts
new file mode 100644
index 0000000000000..14b4a32688f1e
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty8.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+interface I {
+    [Symbol.unscopables]: number;
+    [Symbol.isRegExp]();
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolProperty9.ts b/tests/cases/conformance/es6/Symbols/symbolProperty9.ts
new file mode 100644
index 0000000000000..33ffcb5ee2501
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolProperty9.ts
@@ -0,0 +1,11 @@
+//@target: ES6
+class C {
+    [Symbol.iterator]: { x; y };
+}
+interface I {
+    [Symbol.iterator]: { x };
+}
+
+var i: I;
+i = new C;
+var c: C = i;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType1.ts b/tests/cases/conformance/es6/Symbols/symbolType1.ts
new file mode 100644
index 0000000000000..3a7339fbeb7aa
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType1.ts
@@ -0,0 +1,5 @@
+//@target: ES6
+Symbol() instanceof Symbol;
+Symbol instanceof Symbol();
+(Symbol() || {}) instanceof Object; // This one should be okay, it's a valid way of distinguishing types
+Symbol instanceof (Symbol() || {});
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType10.ts b/tests/cases/conformance/es6/Symbols/symbolType10.ts
new file mode 100644
index 0000000000000..a1ee87de159f8
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType10.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+var s = Symbol.for("bitwise");
+s & s;
+s | s;
+s ^ s;
+
+s & 0;
+0 | s;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType11.ts b/tests/cases/conformance/es6/Symbols/symbolType11.ts
new file mode 100644
index 0000000000000..8b9661bb046b2
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType11.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+var s = Symbol.for("logical");
+s && s;
+s && [];
+0 && s;
+s || s;
+s || 1;
+({}) || s;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType12.ts b/tests/cases/conformance/es6/Symbols/symbolType12.ts
new file mode 100644
index 0000000000000..44852bc10e6f7
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType12.ts
@@ -0,0 +1,29 @@
+//@target: ES6
+var s = Symbol.for("assign");
+var str = "";
+s *= s;
+s *= 0;
+s /= s;
+s /= 0;
+s %= s;
+s %= 0;
+s += s;
+s += 0;
+s += "";
+str += s;
+s -= s;
+s -= 0;
+s <<= s;
+s <<= 0;
+s >>= s;
+s >>= 0;
+s >>>= s;
+s >>>= 0;
+s &= s;
+s &= 0;
+s ^= s;
+s ^= 0;
+s |= s;
+s |= 0;
+
+str += (s || str);
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType13.ts b/tests/cases/conformance/es6/Symbols/symbolType13.ts
new file mode 100644
index 0000000000000..4b657c4c37acb
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType13.ts
@@ -0,0 +1,7 @@
+//@target: ES6
+var s = Symbol();
+var x: any;
+
+for (s in {}) { }
+for (x in s) { }
+for (var y in s) { }
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType14.ts b/tests/cases/conformance/es6/Symbols/symbolType14.ts
new file mode 100644
index 0000000000000..c20a8be874b97
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType14.ts
@@ -0,0 +1,2 @@
+//@target: ES6
+new Symbol();
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType15.ts b/tests/cases/conformance/es6/Symbols/symbolType15.ts
new file mode 100644
index 0000000000000..22f1f9662c0ed
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType15.ts
@@ -0,0 +1,6 @@
+//@target: ES6
+var sym: symbol;
+var symObj: Symbol;
+
+symObj = sym;
+sym = symObj;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType16.ts b/tests/cases/conformance/es6/Symbols/symbolType16.ts
new file mode 100644
index 0000000000000..0421e0ccc0266
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType16.ts
@@ -0,0 +1,7 @@
+//@target: ES6
+interface Symbol {
+    newSymbolProp: number;
+}
+
+var sym: symbol;
+sym.newSymbolProp;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType17.ts b/tests/cases/conformance/es6/Symbols/symbolType17.ts
new file mode 100644
index 0000000000000..95824f1794bd7
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType17.ts
@@ -0,0 +1,11 @@
+//@target: ES6
+interface Foo { prop }
+var x: symbol | Foo;
+
+x;
+if (typeof x === "symbol") {
+    x;
+}
+else {
+    x;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType18.ts b/tests/cases/conformance/es6/Symbols/symbolType18.ts
new file mode 100644
index 0000000000000..caa841717371b
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType18.ts
@@ -0,0 +1,11 @@
+//@target: ES6
+interface Foo { prop }
+var x: symbol | Foo;
+
+x;
+if (typeof x === "object") {
+    x;
+}
+else {
+    x;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType19.ts b/tests/cases/conformance/es6/Symbols/symbolType19.ts
new file mode 100644
index 0000000000000..85d13b2cbdd14
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType19.ts
@@ -0,0 +1,11 @@
+//@target: ES6
+enum E { }
+var x: symbol | E;
+
+x;
+if (typeof x === "number") {
+    x;
+}
+else {
+    x;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType2.ts b/tests/cases/conformance/es6/Symbols/symbolType2.ts
new file mode 100644
index 0000000000000..54954c17bd35d
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType2.ts
@@ -0,0 +1,3 @@
+//@target: ES6
+Symbol.isConcatSpreadable in {};
+"" in Symbol.toPrimitive;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType20.ts b/tests/cases/conformance/es6/Symbols/symbolType20.ts
new file mode 100644
index 0000000000000..ef14e34048bb0
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType20.ts
@@ -0,0 +1,2 @@
+//@target: ES6
+interface symbol { }
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType3.ts b/tests/cases/conformance/es6/Symbols/symbolType3.ts
new file mode 100644
index 0000000000000..b5855ecab41bd
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType3.ts
@@ -0,0 +1,13 @@
+//@target: ES6
+var s = Symbol();
+delete Symbol.iterator;
+void Symbol.toPrimitive;
+typeof Symbol.toStringTag;
+++s;
+--s;
++ Symbol();
+- Symbol();
+~ Symbol();
+! Symbol();
+
++(Symbol() || 0);
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType4.ts b/tests/cases/conformance/es6/Symbols/symbolType4.ts
new file mode 100644
index 0000000000000..bd5b5ba1a06ea
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType4.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+var s = Symbol.for("postfix");
+s++;
+s--;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType5.ts b/tests/cases/conformance/es6/Symbols/symbolType5.ts
new file mode 100644
index 0000000000000..302cfcafdf34a
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType5.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+var s = Symbol.for("multiply");
+s * s;
+s / s;
+s % s;
+
+s * 0;
+0 / s;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType6.ts b/tests/cases/conformance/es6/Symbols/symbolType6.ts
new file mode 100644
index 0000000000000..2efa682b98fa6
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType6.ts
@@ -0,0 +1,16 @@
+//@target: ES6
+var s = Symbol.for("add");
+var a: any;
+s + s;
+s - s;
+s + "";
+s + a;
+s + 0;
+"" + s;
+a + s;
+0 + s;
+s - 0;
+0 - s;
+
+(s || "") + "";
+"" + (s || "");
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType7.ts b/tests/cases/conformance/es6/Symbols/symbolType7.ts
new file mode 100644
index 0000000000000..841ca9e8b10da
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType7.ts
@@ -0,0 +1,8 @@
+//@target: ES6
+var s = Symbol.for("shift");
+s << s;
+s << 0;
+s >> s;
+s >> 0;
+s >>> s;
+s >>> 0;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType8.ts b/tests/cases/conformance/es6/Symbols/symbolType8.ts
new file mode 100644
index 0000000000000..b3bc68094c7c4
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType8.ts
@@ -0,0 +1,13 @@
+//@target: ES6
+var s = Symbol.for("compare");
+s < s;
+s < 0;
+s > s;
+s > 0;
+s <= s;
+s <= 0;
+s >= s;
+s >= 0;
+
+0 >= (s || 0);
+(s || 0) >= s;
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/Symbols/symbolType9.ts b/tests/cases/conformance/es6/Symbols/symbolType9.ts
new file mode 100644
index 0000000000000..1fa431436404e
--- /dev/null
+++ b/tests/cases/conformance/es6/Symbols/symbolType9.ts
@@ -0,0 +1,10 @@
+//@target: ES6
+var s = Symbol.for("equal");
+s == s;
+s == true;
+s != s;
+0 != s;
+s === s;
+s === 1;
+s !== s;
+false !== s;
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer1.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer1.ts
new file mode 100644
index 0000000000000..5c10e2d487be2
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer1.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+interface I {
+    [s: symbol]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer2.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer2.ts
new file mode 100644
index 0000000000000..e5d29c08f7d84
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer2.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+class C {
+    [s: symbol]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer3.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer3.ts
new file mode 100644
index 0000000000000..d4bd13aa1d6b4
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer3.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+var x: {
+    [s: symbol]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty1.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty1.ts
new file mode 100644
index 0000000000000..64ca01bba6c80
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty1.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+interface I {
+    [Symbol.iterator]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty2.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty2.ts
new file mode 100644
index 0000000000000..cc606c2e6a3d5
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty2.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+interface I {
+    [Symbol.unscopables](): string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty3.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty3.ts
new file mode 100644
index 0000000000000..978d4ef95f018
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty3.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+declare class C {
+    [Symbol.unscopables](): string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty4.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty4.ts
new file mode 100644
index 0000000000000..7f16672ebd254
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty4.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+declare class C {
+    [Symbol.isRegExp]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty5.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty5.ts
new file mode 100644
index 0000000000000..fb7f00d769420
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty5.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+class C {
+    [Symbol.isRegExp]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty6.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty6.ts
new file mode 100644
index 0000000000000..3fc8e6f897977
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty6.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+class C {
+    [Symbol.toStringTag]: string = "";
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty7.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty7.ts
new file mode 100644
index 0000000000000..a27636388c074
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty7.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+class C {
+    [Symbol.toStringTag](): void { }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty8.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty8.ts
new file mode 100644
index 0000000000000..78e5738f7da8e
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty8.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+var x: {
+    [Symbol.toPrimitive](): string
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty9.ts b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty9.ts
new file mode 100644
index 0000000000000..7838df4d8fcbf
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolProperty9.ts
@@ -0,0 +1,4 @@
+//@target: ES5
+var x: {
+    [Symbol.toPrimitive]: string
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer1.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer1.ts
new file mode 100644
index 0000000000000..805584ef078f1
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer1.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+interface I {
+    [s: symbol]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer2.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer2.ts
new file mode 100644
index 0000000000000..c593d0a4b0ab8
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer2.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+class C {
+    [s: symbol]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer3.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer3.ts
new file mode 100644
index 0000000000000..183ecea6e6342
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer3.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+class C {
+    static [s: symbol]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer4.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer4.ts
new file mode 100644
index 0000000000000..c6f9077f64807
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer4.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+var x: {
+    [s: symbol]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer5.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer5.ts
new file mode 100644
index 0000000000000..a028a3b648858
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer5.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+var x = {
+    [s: symbol]: ""
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty1.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty1.ts
new file mode 100644
index 0000000000000..d29272fd561c4
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty1.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+interface I {
+    [Symbol.iterator]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty2.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty2.ts
new file mode 100644
index 0000000000000..3ef11e99aa96a
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty2.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+interface I {
+    [Symbol.unscopables](): string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty3.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty3.ts
new file mode 100644
index 0000000000000..d63302991d0cd
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty3.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+declare class C {
+    [Symbol.unscopables](): string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty4.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty4.ts
new file mode 100644
index 0000000000000..6a0962f15cb34
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty4.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+declare class C {
+    [Symbol.isRegExp]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty5.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty5.ts
new file mode 100644
index 0000000000000..5f3fbaeaaea10
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty5.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+class C {
+    [Symbol.isRegExp]: string;
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty6.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty6.ts
new file mode 100644
index 0000000000000..24d67c8b707c2
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty6.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+class C {
+    [Symbol.toStringTag]: string = "";
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty7.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty7.ts
new file mode 100644
index 0000000000000..69f2f4b30f801
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty7.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+class C {
+    [Symbol.toStringTag](): void { }
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty8.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty8.ts
new file mode 100644
index 0000000000000..dcc6d5b761587
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty8.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+var x: {
+    [Symbol.toPrimitive](): string
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty9.ts b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty9.ts
new file mode 100644
index 0000000000000..b7093f188d26d
--- /dev/null
+++ b/tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolProperty9.ts
@@ -0,0 +1,4 @@
+//@target: ES6
+var x: {
+    [Symbol.toPrimitive]: string
+}
\ No newline at end of file
diff --git a/tests/cases/fourslash/scriptLexicalStructureSymbols1.ts b/tests/cases/fourslash/scriptLexicalStructureSymbols1.ts
new file mode 100644
index 0000000000000..e3dde6738e95b
--- /dev/null
+++ b/tests/cases/fourslash/scriptLexicalStructureSymbols1.ts
@@ -0,0 +1,17 @@
+/// <reference path="fourslash.ts"/>
+
+////{| "itemName": "C", "kind": "class", "parentName": "" |}
+////class C {
+////    {| "itemName": "[Symbol.isRegExp]", "kind": "property", "parentName": "C" |}
+////    [Symbol.isRegExp] = 0;
+////    {| "itemName": "[Symbol.iterator]", "kind": "method", "parentName": "C" |}
+////    [Symbol.iterator]() { }
+////    {| "itemName": "[Symbol.isConcatSpreadable]", "kind": "getter", "parentName": "C" |}
+////    get [Symbol.isConcatSpreadable]() { }
+////}
+
+test.markers().forEach(marker => {
+    verify.getScriptLexicalStructureListContains(marker.data.itemName, marker.data.kind, marker.fileName, marker.data.parentName);
+});
+
+verify.getScriptLexicalStructureListCount(test.markers().length);
\ No newline at end of file
diff --git a/tests/cases/fourslash/scriptLexicalStructureSymbols2.ts b/tests/cases/fourslash/scriptLexicalStructureSymbols2.ts
new file mode 100644
index 0000000000000..d048de895ecce
--- /dev/null
+++ b/tests/cases/fourslash/scriptLexicalStructureSymbols2.ts
@@ -0,0 +1,15 @@
+/// <reference path="fourslash.ts"/>
+
+////{| "itemName": "I", "kind": "interface", "parentName": "" |}
+////interface I {
+////    {| "itemName": "[Symbol.isRegExp]", "kind": "property", "parentName": "I" |}
+////    [Symbol.isRegExp]: string;
+////    {| "itemName": "[Symbol.iterator]", "kind": "method", "parentName": "I" |}
+////    [Symbol.iterator](): string;
+////}
+
+test.markers().forEach(marker => {
+    verify.getScriptLexicalStructureListContains(marker.data.itemName, marker.data.kind, marker.fileName, marker.data.parentName);
+});
+
+verify.getScriptLexicalStructureListCount(test.markers().length);
\ No newline at end of file
diff --git a/tests/cases/fourslash/scriptLexicalStructureSymbols3.ts b/tests/cases/fourslash/scriptLexicalStructureSymbols3.ts
new file mode 100644
index 0000000000000..19f81037559b3
--- /dev/null
+++ b/tests/cases/fourslash/scriptLexicalStructureSymbols3.ts
@@ -0,0 +1,13 @@
+/// <reference path="fourslash.ts"/>
+
+////{| "itemName": "E", "kind": "enum", "parentName": "" |}
+////enum E {
+////    // No nav bar entry for this
+////    [Symbol.isRegExp] = 0
+////}
+
+test.markers().forEach(marker => {
+    verify.getScriptLexicalStructureListContains(marker.data.itemName, marker.data.kind, marker.fileName, marker.data.parentName);
+});
+
+verify.getScriptLexicalStructureListCount(test.markers().length);
\ No newline at end of file