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ClassCastException: Trees$DocDef cannot be cast to Trees$ClassDef #9011

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scabug opened this issue Nov 27, 2014 · 8 comments
Closed

ClassCastException: Trees$DocDef cannot be cast to Trees$ClassDef #9011

scabug opened this issue Nov 27, 2014 · 8 comments
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@retronym
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presentation compiler scaladoc tool
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2.11.5

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@scabug
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scabug commented Nov 27, 2014

The exception happens indeed at a cast. It looks like a Docdef makes its way into namer.

      } else if (sym != null && sym.isClass && sym.isImplicit) {
        val owningInfo = sym.owner.info
        val existingDerivedSym = owningInfo.decl(sym.name.toTermName).filter(sym => sym.isSynthetic && sym.isMethod)
        existingDerivedSym.alternatives foreach (owningInfo.decls.unlink)
        enterImplicitWrapper(tree.asInstanceOf[ClassDef])
      }
      super.enterExistingSym(sym, tree)
java.lang.ClassCastException: scala.tools.nsc.ast.Trees$DocDef cannot be cast to scala.reflect.internal.Trees$ClassDef
	at scala.tools.nsc.interactive.InteractiveAnalyzer$InteractiveNamer$class.enterExistingSym(Global.scala:81)
	at scala.tools.nsc.interactive.InteractiveAnalyzer$$anon$7.enterExistingSym(Global.scala:40)
	at scala.tools.nsc.typechecker.Namers$Namer.standardEnterSym(Namers.scala:299)
	at scala.tools.nsc.typechecker.AnalyzerPlugins$class.pluginsEnterSym(AnalyzerPlugins.scala:422)
	at org.scalaide.core.internal.compiler.ScalaPresentationCompiler$$anon$1.pluginsEnterSym(ScalaPresentationCompiler.scala:85)
	at scala.tools.nsc.typechecker.Namers$Namer.enterSym(Namers.scala:274)
	at scala.tools.nsc.typechecker.Typers$Typer.enterSym(Typers.scala:1837)
	at scala.tools.nsc.typechecker.Typers$Typer.enterSyms(Typers.scala:1832)
	at scala.tools.nsc.typechecker.Typers$Typer.typedTemplate(Typers.scala:1873)
	at scala.tools.nsc.typechecker.Typers$Typer.typedClassDef(Typers.scala:1744)
	at scala.tools.nsc.typechecker.Typers$Typer.typedMemberDef$1(Typers.scala:5262)
	at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5312)
	at scala.tools.nsc.typechecker.Typers$Typer.runTyper$1(Typers.scala:5349)
	at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$typedInternal(Typers.scala:5376)
	at scala.tools.nsc.typechecker.Typers$Typer.body$2(Typers.scala:5323)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5327)
	at scala.tools.nsc.typechecker.Typers$Typer.typedByValueExpr(Typers.scala:5405)
	at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$typedStat$1(Typers.scala:3028)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$62.apply(Typers.scala:3132)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$62.apply(Typers.scala:3132)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:3132)
	at scala.tools.nsc.typechecker.Typers$Typer.typedPackageDef$1(Typers.scala:4969)
	at scala.tools.nsc.typechecker.Typers$Typer.typedMemberDef$1(Typers.scala:5265)
	at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5312)
	at scala.tools.nsc.typechecker.Typers$Typer.runTyper$1(Typers.scala:5349)
	at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$typedInternal(Typers.scala:5376)
	at scala.tools.nsc.typechecker.Typers$Typer.body$2(Typers.scala:5323)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5327)
	at scala.tools.nsc.typechecker.Typers$Typer.typedByValueExpr(Typers.scala:5405)
	at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$typedStat$1(Typers.scala:3028)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$62.apply(Typers.scala:3132)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$62.apply(Typers.scala:3132)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:3132)
	at scala.tools.nsc.typechecker.Typers$Typer.typedPackageDef$1(Typers.scala:4969)
	at scala.tools.nsc.typechecker.Typers$Typer.typedMemberDef$1(Typers.scala:5265)
	at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5312)
	at scala.tools.nsc.typechecker.Typers$Typer.runTyper$1(Typers.scala:5349)
	at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$typedInternal(Typers.scala:5376)
	at scala.tools.nsc.typechecker.Typers$Typer.body$2(Typers.scala:5323)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5327)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5401)
	at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3.apply(Analyzer.scala:102)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$applyPhase$1.apply$mcV$sp(Global.scala:428)
	at scala.tools.nsc.Global$GlobalPhase.withCurrentUnit(Global.scala:419)
	at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:428)
	at scala.tools.nsc.interactive.Global$TyperRun$$anonfun$applyPhase$1.apply(Global.scala:1222)
	at scala.tools.nsc.interactive.Global$TyperRun$$anonfun$applyPhase$1.apply(Global.scala:1222)
	at scala.reflect.internal.SymbolTable.enteringPhase(SymbolTable.scala:235)
	at scala.tools.nsc.interactive.Global$TyperRun.applyPhase(Global.scala:1222)
	at scala.tools.nsc.interactive.Global$TyperRun.typeCheck(Global.scala:1215)
	at scala.tools.nsc.interactive.Global.scala$tools$nsc$interactive$Global$$typeCheck(Global.scala:664)
	at scala.tools.nsc.interactive.Global$$anonfun$backgroundCompile$5$$anonfun$apply$8.apply(Global.scala:579)
	at scala.tools.nsc.interactive.Global$$anonfun$backgroundCompile$5.apply(Global.scala:575)
	at scala.tools.nsc.interactive.Global$$anonfun$backgroundCompile$5.apply(Global.scala:575)
	at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:778)
	at scala.collection.immutable.List.foreach(List.scala:381)
	at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:777)
	at scala.tools.nsc.interactive.Global.backgroundCompile(Global.scala:575)
	at scala.tools.nsc.interactive.PresentationCompilerThread.run(PresentationCompilerThread.scala:25)
@scabug
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scabug commented Nov 27, 2014

Imported From: https://issues.scala-lang.org/browse/SI-9011?orig=1
Reporter: @dragos
Affected Versions: 2.11.5
See #8479

@scabug
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scabug commented Dec 3, 2014

@retronym said:
This comment in TreeInfo rings true:

  // TODO these overrides, and the slow trickle of bugs that they solve (e.g. SI-8479),
  //      suggest that we should pursue an alternative design in which the DocDef nodes
  //      are eliminated from the tree before typer, and instead are modelled as tree
  //      attachments.

I take it this bug showed up in the IDE after mixing Interactive with ScalaDoc.

@scabug
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scabug commented Dec 3, 2014

@retronym said:
Looking that the stack trace, it might be triggered by a documented member class.

@scabug
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scabug commented Dec 3, 2014

@dragos said:
The surprising thing is that it won't happen every time. I couldn't reproduce it on a small example with documented inner classes..

@scabug
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scabug commented Dec 3, 2014

@dragos said:
It seems to happen way more often when I have a documented implicit class (for example, when opening scala.reflect.api.Quasiquotes).

@scabug
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scabug commented Dec 10, 2014

@dragos said:
Could we mark this a blocker for 2.11.5? It makes it very annoying to work on sources with quasiquotes/reflection. Let me know if I can help.

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scabug commented Dec 15, 2014

@retronym said:
@dragos could you please review and try out scala/scala#4205 ?

@scabug scabug closed this as completed Dec 23, 2014
@scabug
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scabug commented Nov 25, 2016

@dragos said:
Fixed by Jason in c77b7a7

@scabug scabug added this to the 2.11.5 milestone Apr 7, 2017
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