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compiler crash involving traits, public/private, and separate compilation #3076

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scabug opened this issue Feb 19, 2010 · 4 comments
Closed

compiler crash involving traits, public/private, and separate compilation #3076

scabug opened this issue Feb 19, 2010 · 4 comments
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@odersky

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@scabug
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scabug commented Feb 19, 2010 

  ~/newbug> rm *.class
  ~/newbug> cat T.scala                                               
trait T { private val z = new C1 }
private class C1
  ~/newbug> /usr/local/scala-2.8.0.Beta1-prerelease/bin/scalac T.scala 
  ~/newbug> cat C.scala 
class C2 {
  def m1() { new T { } }
  def m2() { new T { } }
}
  ~/newbug> /usr/local/scala-2.8.0.Beta1-prerelease/bin/scalac C.scala
exception when typing final <stable> <accessor> def T$$$$z(): C1 = C2$$$$anon$$2.this.T$$$$z
private class C1 escapes its defining scope as part of type C1 in file null
scala.tools.nsc.symtab.Types$$TypeError: private class C1 escapes its defining scope as part of type C1
	at scala.tools.nsc.typechecker.Contexts$$Context.error(Contexts.scala:318)
	at scala.tools.nsc.typechecker.Infer$$Inferencer.error(Infer.scala:273)
	at scala.tools.nsc.typechecker.Typers$$Typer$$checkNoEscaping$$.check(Typers.scala:444)
	at scala.tools.nsc.typechecker.Typers$$Typer.typedDefDef(Typers.scala:1807)
	at scala.tools.nsc.typechecker.Typers$$Typer.typed1(Typers.scala:3751)
	at scala.tools.nsc.transform.Erasure$$Eraser.liftedTree1$$1(Erasure.scala:627)
	at scala.tools.nsc.transform.Erasure$$Eraser.typed1(Erasure.scala:626)
	at scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:4087)
	at scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:4140)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.typedPos(Mixin.scala:431)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.attributedDef$$1(Mixin.scala:543)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.addDef$$1(Mixin.scala:553)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer$$$$anonfun$$addNewDefs$$1.apply(Mixin.scala:844)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer$$$$anonfun$$addNewDefs$$1.apply(Mixin.scala:834)
	at scala.collection.LinearSeqLike$$class.foreach(LinearSeqLike.scala:97)
	at scala.collection.immutable.List.foreach(List.scala:46)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.addNewDefs(Mixin.scala:834)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.scala$$tools$$nsc$$transform$$Mixin$$MixinTransformer$$$$postTransform(Mixin.scala:964)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer$$$$anonfun$$16.apply(Mixin.scala:1060)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer$$$$anonfun$$16.apply(Mixin.scala:1060)
	at scala.tools.nsc.symtab.SymbolTable.atPhase(SymbolTable.scala:99)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.transform(Mixin.scala:1060)
	at scala.tools.nsc.ast.Trees$$Transformer.transformTemplate(Trees.scala:1556)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$2.apply(Trees.scala:1446)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$2.apply(Trees.scala:1445)
	at scala.tools.nsc.ast.Trees$$Transformer.atOwner(Trees.scala:1580)
	at scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1444)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.transform(Mixin.scala:1059)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1572)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1570)
	at scala.collection.immutable.List.loop$$1(List.scala:116)
	at scala.collection.immutable.List.mapConserve(List.scala:133)
	at scala.collection.immutable.List.loop$$1(List.scala:120)
	at scala.collection.immutable.List.mapConserve(List.scala:133)
	at scala.collection.immutable.List.loop$$1(List.scala:120)
	at scala.collection.immutable.List.mapConserve(List.scala:133)
	at scala.tools.nsc.ast.Trees$$Transformer.transformStats(Trees.scala:1570)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$1.apply(Trees.scala:1440)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$1.apply(Trees.scala:1440)
	at scala.tools.nsc.ast.Trees$$Transformer.atOwner(Trees.scala:1580)
	at scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1439)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.transform(Mixin.scala:1059)
	at scala.tools.nsc.ast.Trees$$Transformer.transformUnit(Trees.scala:1573)
	at scala.tools.nsc.transform.Transform$$Phase.apply(Transform.scala:31)
	at scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$applyPhase$$1.apply(Global.scala:281)
	at scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$applyPhase$$1.apply(Global.scala:281)
	at scala.tools.nsc.reporters.Reporter.withSource(Reporter.scala:48)
	at scala.tools.nsc.Global$$GlobalPhase.applyPhase(Global.scala:281)
	at scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$run$$1.apply(Global.scala:259)
	at scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$run$$1.apply(Global.scala:259)
	at scala.collection.Iterator$$class.foreach(Iterator.scala:582)
	at scala.collection.mutable.ListBuffer$$$$anon$$1.foreach(ListBuffer.scala:285)
	at scala.tools.nsc.Global$$GlobalPhase.run(Global.scala:259)
	at scala.tools.nsc.Global$$Run.compileSources(Global.scala:749)
	at scala.tools.nsc.Global$$Run.compile(Global.scala:839)
	at scala.tools.nsc.Main$$.process(Main.scala:110)
	at scala.tools.nsc.Main$$.main(Main.scala:124)
	at scala.tools.nsc.Main.main(Main.scala)
Exception in thread "main" java.lang.Error
	at scala.tools.nsc.transform.Erasure$$Eraser.liftedTree1$$1(Erasure.scala:637)
	at scala.tools.nsc.transform.Erasure$$Eraser.typed1(Erasure.scala:626)
	at scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:4087)
	at scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:4140)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.typedPos(Mixin.scala:431)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.attributedDef$$1(Mixin.scala:543)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.addDef$$1(Mixin.scala:553)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer$$$$anonfun$$addNewDefs$$1.apply(Mixin.scala:844)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer$$$$anonfun$$addNewDefs$$1.apply(Mixin.scala:834)
	at scala.collection.LinearSeqLike$$class.foreach(LinearSeqLike.scala:97)
	at scala.collection.immutable.List.foreach(List.scala:46)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.addNewDefs(Mixin.scala:834)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.scala$$tools$$nsc$$transform$$Mixin$$MixinTransformer$$$$postTransform(Mixin.scala:964)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer$$$$anonfun$$16.apply(Mixin.scala:1060)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer$$$$anonfun$$16.apply(Mixin.scala:1060)
	at scala.tools.nsc.symtab.SymbolTable.atPhase(SymbolTable.scala:99)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.transform(Mixin.scala:1060)
	at scala.tools.nsc.ast.Trees$$Transformer.transformTemplate(Trees.scala:1556)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$2.apply(Trees.scala:1446)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$2.apply(Trees.scala:1445)
	at scala.tools.nsc.ast.Trees$$Transformer.atOwner(Trees.scala:1580)
	at scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1444)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.transform(Mixin.scala:1059)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1572)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1570)
	at scala.collection.immutable.List.loop$$1(List.scala:116)
	at scala.collection.immutable.List.mapConserve(List.scala:133)
	at scala.collection.immutable.List.loop$$1(List.scala:120)
	at scala.collection.immutable.List.mapConserve(List.scala:133)
	at scala.collection.immutable.List.loop$$1(List.scala:120)
	at scala.collection.immutable.List.mapConserve(List.scala:133)
	at scala.tools.nsc.ast.Trees$$Transformer.transformStats(Trees.scala:1570)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$1.apply(Trees.scala:1440)
	at scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$1.apply(Trees.scala:1440)
	at scala.tools.nsc.ast.Trees$$Transformer.atOwner(Trees.scala:1580)
	at scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1439)
	at scala.tools.nsc.transform.Mixin$$MixinTransformer.transform(Mixin.scala:1059)
	at scala.tools.nsc.ast.Trees$$Transformer.transformUnit(Trees.scala:1573)
	at scala.tools.nsc.transform.Transform$$Phase.apply(Transform.scala:31)
	at scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$applyPhase$$1.apply(Global.scala:281)
	at scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$applyPhase$$1.apply(Global.scala:281)
	at scala.tools.nsc.reporters.Reporter.withSource(Reporter.scala:48)
	at scala.tools.nsc.Global$$GlobalPhase.applyPhase(Global.scala:281)
	at scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$run$$1.apply(Global.scala:259)
	at scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$run$$1.apply(Global.scala:259)
	at scala.collection.Iterator$$class.foreach(Iterator.scala:582)
	at scala.collection.mutable.ListBuffer$$$$anon$$1.foreach(ListBuffer.scala:285)
	at scala.tools.nsc.Global$$GlobalPhase.run(Global.scala:259)
	at scala.tools.nsc.Global$$Run.compileSources(Global.scala:749)
	at scala.tools.nsc.Global$$Run.compile(Global.scala:839)
	at scala.tools.nsc.Main$$.process(Main.scala:110)
	at scala.tools.nsc.Main$$.main(Main.scala:124)
	at scala.tools.nsc.Main.main(Main.scala)

note that there are two separate stack traces here.

the same thing happens in 2.7.7, too.
@scabug
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scabug commented Feb 19, 2010

Imported From: https://issues.scala-lang.org/browse/SI-3076?orig=1
Reporter: @SethTisue

@scabug
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scabug commented Feb 23, 2010

@axel22 said:
This seems to be fixed in scala 2.8 r20879. Since T is not in classpath, it behaves as expected.

~/tmp/scala-2.8.0.r20879-b20100214020153/bin$$ cat T.scala
trait T { private val z = new C1 }
private class C1

~/tmp/scala-2.8.0.r20879-b20100214020153/bin$$ cat C.scala
class C2 {
  def m1() { new T { } }
  def m2() { new T { } }
}

~/tmp/scala-2.8.0.r20879-b20100214020153/bin$$ ./scalac T.scala

~/tmp/scala-2.8.0.r20879-b20100214020153/bin$$ ./scalac C.scala
C.scala:2: error: not found: type T
  def m1() { new T { } }
                 ^
C.scala:3: error: not found: type T
  def m2() { new T { } }
                 ^
two errors found

@scabug
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scabug commented Feb 23, 2010

@harrah said:
The error still occurs in r20961.

T is on the classpath. There is no classpath otherwise specified, so the current directory is on the classpath. Perhaps r20879 just caught the classpaths rework at a bad time.

@scabug
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scabug commented Mar 1, 2010

@odersky said:
(In r21019) Closes #3076. Review by community.

@scabug scabug closed this as completed May 18, 2011
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