fix #12401: mangle ctor names in ExtractAPI

compiler/src/dotty/tools/dotc/sbt/ExtractAPI.scala

@@ -366,7 +366,7 @@ private class ExtractAPICollector(using Context) extends ThunkHolder {
     val vparamss = paramLists(sym.info, sym.paramSymss)
     val retTp = sym.info.finalResultType.widenExpr
 
-    api.Def.of(sym.name.toString, apiAccess(sym), apiModifiers(sym),
+    api.Def.of(sym.zincMangledName.toString, apiAccess(sym), apiModifiers(sym),
       apiAnnotations(sym).toArray, tparams.toArray, vparamss.toArray, apiType(retTp))
   }
 

compiler/src/dotty/tools/dotc/sbt/ExtractDependencies.scala

@@ -310,14 +310,6 @@ private class ExtractDependenciesCollector extends tpd.TreeTraverser { thisTreeT
     }
   }
 
-  /** Mangle a JVM symbol name in a format better suited for internal uses by sbt. */
-  private def mangledName(sym: Symbol)(using Context): Name = {
-    def constructorName = sym.owner.fullName ++ ";init;"
-
-    if (sym.isConstructor) constructorName
-    else sym.name.stripModuleClassSuffix
-  }
-
   private def addMemberRefDependency(sym: Symbol)(using Context): Unit =
     if (!ignoreDependency(sym)) {
       val enclOrModuleClass = if (sym.is(ModuleVal)) sym.moduleClass else sym.enclosingClass
@@ -327,7 +319,7 @@ private class ExtractDependenciesCollector extends tpd.TreeTraverser { thisTreeT
       if (fromClass.exists) { // can happen when visiting imports
         assert(fromClass.isClass)
 
-        addUsedName(fromClass, mangledName(sym), UseScope.Default)
+        addUsedName(fromClass, sym.zincMangledName, UseScope.Default)
         // packages have class symbol. Only record them as used names but not dependency
         if (!sym.is(Package)) {
           _dependencies += ClassDependency(fromClass, enclOrModuleClass, DependencyByMemberRef)
@@ -490,7 +482,7 @@ private class ExtractDependenciesCollector extends tpd.TreeTraverser { thisTreeT
     val traverser = new TypeDependencyTraverser {
       def addDependency(symbol: Symbol) =
         if (!ignoreDependency(symbol) && symbol.is(Sealed)) {
-          val usedName = mangledName(symbol)
+          val usedName = symbol.zincMangledName
           addUsedName(usedName, UseScope.PatMatTarget)
         }
     }

compiler/src/dotty/tools/dotc/sbt/package.scala

@@ -0,0 +1,16 @@
+package dotty.tools.dotc.sbt
+
+import dotty.tools.dotc.core.Contexts.Context
+import dotty.tools.dotc.core.Symbols.Symbol
+import dotty.tools.dotc.core.NameOps.stripModuleClassSuffix
+import dotty.tools.dotc.core.Names.Name
+
+extension (sym: Symbol)
+
+  def constructorName(using Context) =
+    sym.owner.fullName ++ ";init;"
+
+  /** Mangle a JVM symbol name in a format better suited for internal uses by sbt. */
+  def zincMangledName(using Context): Name =
+    if (sym.isConstructor) constructorName
+    else sym.name.stripModuleClassSuffix

sbt-test/source-dependencies/constructors-curried/A.scala

@@ -0,0 +1 @@
+class A(a: Int)

sbt-test/source-dependencies/constructors-curried/B.scala

@@ -0,0 +1 @@
+class B { val y = new A(2) }

sbt-test/source-dependencies/constructors-curried/changes/A2.scala

@@ -0,0 +1 @@
+class A(a: Int)(b: String)

sbt-test/source-dependencies/constructors-curried/changes/B2.scala

@@ -0,0 +1 @@
+class B { val y = new A(2)("a") }

sbt-test/source-dependencies/constructors-curried/project/DottyInjectedPlugin.scala

@@ -0,0 +1,12 @@
+import sbt._
+import Keys._
+
+object DottyInjectedPlugin extends AutoPlugin {
+  override def requires = plugins.JvmPlugin
+  override def trigger = allRequirements
+
+  override val projectSettings = Seq(
+    scalaVersion := sys.props("plugin.scalaVersion"),
+    scalacOptions += "-source:3.0-migration"
+  )
+}

sbt-test/source-dependencies/constructors-curried/test

@@ -0,0 +1,10 @@
+> compile
+$ copy-file changes/A2.scala A.scala
+# we should detect that A has changed,
+# this should trigger recompilation of B,
+# which should fail due to missing curried argument
+-> compile
+$ copy-file changes/B2.scala B.scala
+# B is updated so that it passes an extra
+# argument to A's constructor, it should compile
+> compile

sbt-test/source-dependencies/constructors/A.scala

@@ -0,0 +1 @@
+class A(a: Int)

sbt-test/source-dependencies/constructors/B.scala

@@ -0,0 +1 @@
+class B { val y = new A(2) }

sbt-test/source-dependencies/constructors/changes/A2.scala

@@ -0,0 +1 @@
+class A(a: String)

sbt-test/source-dependencies/constructors/changes/B2.scala

@@ -0,0 +1 @@
+class B { val y = new A("a") }

sbt-test/source-dependencies/constructors/project/DottyInjectedPlugin.scala

@@ -0,0 +1,12 @@
+import sbt._
+import Keys._
+
+object DottyInjectedPlugin extends AutoPlugin {
+  override def requires = plugins.JvmPlugin
+  override def trigger = allRequirements
+
+  override val projectSettings = Seq(
+    scalaVersion := sys.props("plugin.scalaVersion"),
+    scalacOptions += "-source:3.0-migration"
+  )
+}

sbt-test/source-dependencies/constructors/test

@@ -0,0 +1,10 @@
+> compile
+$ copy-file changes/A2.scala A.scala
+# we should detect that A has changed,
+# this should trigger recompilation of B,
+# which should fail due to mismatched arguments
+-> compile
+$ copy-file changes/B2.scala B.scala
+# B is updated so that it passes a correct
+# argument to A's constructor, it should compile
+> compile