Fixes microsoft#20475 (no repro found yet)

RyanCavanaugh · RyanCavanaugh · commit c596bab2ec94 · 2017-12-07T12:33:40.000-08:00
diff --git a/src/services/symbolDisplay.ts b/src/services/symbolDisplay.ts
@@ -496,7 +496,7 @@ namespace ts.SymbolDisplay {
             addNewLineIfDisplayPartsExist();
             if (symbolKind) {
                 pushTypePart(symbolKind);
-                if (!some(symbol.declarations, d => isArrowFunction(d) || (isFunctionExpression(d) || isClassExpression(d)) && !d.name)) {
+                if (symbol && !some(symbol.declarations, d => isArrowFunction(d) || (isFunctionExpression(d) || isClassExpression(d)) && !d.name)) {
                     displayParts.push(spacePart());
                     addFullSymbolName(symbol);
                 }

Original file line number	Diff line number	Diff line change
`@@ -496,7 +496,7 @@ namespace ts.SymbolDisplay {`
`496`	`496`	`addNewLineIfDisplayPartsExist();`
`497`	`497`	`if (symbolKind) {`
`498`	`498`	`pushTypePart(symbolKind);`
`499`		`- if (!some(symbol.declarations, d => isArrowFunction(d) \|\| (isFunctionExpression(d) \|\| isClassExpression(d)) && !d.name)) {`
	`499`	`+ if (symbol && !some(symbol.declarations, d => isArrowFunction(d) \|\| (isFunctionExpression(d) \|\| isClassExpression(d)) && !d.name)) {`
`500`	`500`	`displayParts.push(spacePart());`
`501`	`501`	`addFullSymbolName(symbol);`
`502`	`502`	`}`