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Compiler internal error(s) on returned if expression #2018

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scabug opened this issue May 26, 2009 · 2 comments
Closed

Compiler internal error(s) on returned if expression #2018

scabug opened this issue May 26, 2009 · 2 comments
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@dragos

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scabug commented May 26, 2009

Compiler internal errors reported when compiling the following code fragment:

class A {
  val b = new B

  def getChildren = List(new A).elements

  class B {
    private def check = true

    private def getAncestor(p: A): A = {
      val c = (p.getChildren.find(_.b.check)) match {case Some(d) => d case None => p}

      if (c == p) p else c.b.getAncestor(c)
    }
  }
}

Compiler was 2.7.4-final on vista.

Build / Run env was IntelliJ IDEA 8.1.2 with scala plugin 0.2.24468

The following compiler output was produced:

Information:Compilation completed with 57 errors and 0 warnings
Information:57 errors
Information:0 warnings
Error:Scalac internal error: class java.lang.reflect.InvocationTargetException [sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.jetbrains.plugins.scala.compiler.rt.ScalacRunner.main(ScalacRunner.java:74)][scala.tools.nsc.typechecker.Contexts$$Context.error(Contexts.scala:352)
scala.tools.nsc.typechecker.Infer$$Inferencer.error(Infer.scala:266)
scala.tools.nsc.typechecker.Infer$$Inferencer.typeError(Infer.scala:276)
scala.tools.nsc.typechecker.Infer$$Inferencer.typeErrorTree(Infer.scala:285)
scala.tools.nsc.typechecker.Typers$$Typer.adapt(Typers.scala:862)
scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3363)
scala.tools.nsc.typechecker.Typers$$Typer.typedArg(Typers.scala:1649)
scala.tools.nsc.typechecker.Typers$$Typer$$$$anonfun$$typedArgs$$2.apply(Typers.scala:1690)
scala.tools.nsc.typechecker.Typers$$Typer$$$$anonfun$$typedArgs$$2.apply(Typers.scala:1690)
scala.List$$.map2(List.scala:333)
scala.tools.nsc.typechecker.Typers$$Typer.typedArgs(Typers.scala:1690)
scala.tools.nsc.typechecker.Typers$$Typer.doTypedApply(Typers.scala:1774)
scala.tools.nsc.typechecker.Typers$$Typer.typedApply$$1(Typers.scala:2657)
scala.tools.nsc.typechecker.Typers$$Typer.typed1(Typers.scala:3257)
scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3358)
scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3395)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.rewriteTailCall(TailCalls.scala:321)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:285)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:232)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:215)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:144)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:173)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1478)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1476)
scala.List$$.loop$$1(List.scala:300)
scala.List$$.mapConserve(List.scala:317)
scala.tools.nsc.ast.Trees$$Transformer.transformStats(Trees.scala:1476)
scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1384)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:210)
scala.tools.nsc.ast.Trees$$Transformer.transformTemplate(Trees.scala:1462)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$2.apply(Trees.scala:1356)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$2.apply(Trees.scala:1356)
scala.tools.nsc.ast.Trees$$Transformer.atOwner(Trees.scala:1484)
scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1355)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:202)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1478)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1476)
scala.List$$.loop$$1(List.scala:300)
scala.List$$.mapConserve(List.scala:317)
scala.tools.nsc.ast.Trees$$Transformer.transformStats(Trees.scala:1476)
scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1384)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:210)
scala.tools.nsc.ast.Trees$$Transformer.transformTemplate(Trees.scala:1462)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$2.apply(Trees.scala:1356)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$2.apply(Trees.scala:1356)
scala.tools.nsc.ast.Trees$$Transformer.atOwner(Trees.scala:1484)
scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1355)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:202)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1478)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1476)
scala.List$$.loop$$1(List.scala:300)
scala.List$$.mapConserve(List.scala:317)
scala.tools.nsc.ast.Trees$$Transformer.transformStats(Trees.scala:1476)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$1.apply(Trees.scala:1352)
scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$1.apply(Trees.scala:1352)
scala.tools.nsc.ast.Trees$$Transformer.atOwner(Trees.scala:1484)
scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1351)
scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:198)
scala.tools.nsc.ast.Trees$$Transformer.transformUnit(Trees.scala:1479)
scala.tools.nsc.transform.TailCalls$$Phase.apply(TailCalls.scala:37)
scala.tools.nsc.Global$$GlobalPhase.applyPhase(Global.scala:267)
scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$run$$1.apply(Global.scala:246)
scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$run$$1.apply(Global.scala:246)
scala.Iterator$$class.foreach(Iterator.scala:414)
scala.collection.mutable.ListBuffer$$$$anon$$1.foreach(ListBuffer.scala:266)
scala.tools.nsc.Global$$GlobalPhase.run(Global.scala:246)
scala.tools.nsc.Global$$Run.compileSources(Global.scala:574)
scala.tools.nsc.Global$$Run.compile(Global.scala:667)
scala.tools.nsc.Main$$.process(Main.scala:73)
scala.tools.nsc.Main$$.main(Main.scala:87)
scala.tools.nsc.Main.main(Main.scala)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.jetbrains.plugins.scala.compiler.rt.ScalacRunner.main(ScalacRunner.java:74)]
Error:sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Error:sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
Error:sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
Error:java.lang.reflect.Method.invoke(Method.java:597)
Error:org.jetbrains.plugins.scala.compiler.rt.ScalacRunner.main(ScalacRunner.java:74)
Error:Caused by scala.tools.nsc.symtab.Types$$TypeError: type mismatch;
Error:found   : c.b.type (with underlying type c.B)
Error:required: A.this.B
Error:scala.tools.nsc.typechecker.Contexts$$Context.error(Contexts.scala:352)
Error:scala.tools.nsc.typechecker.Infer$$Inferencer.error(Infer.scala:266)
Error:scala.tools.nsc.typechecker.Infer$$Inferencer.typeError(Infer.scala:276)
Error:scala.tools.nsc.typechecker.Infer$$Inferencer.typeErrorTree(Infer.scala:285)
Error:scala.tools.nsc.typechecker.Typers$$Typer.adapt(Typers.scala:862)
Error:scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3363)
Error:scala.tools.nsc.typechecker.Typers$$Typer.typedArg(Typers.scala:1649)
Error:scala.tools.nsc.typechecker.Typers$$Typer$$$$anonfun$$typedArgs$$2.apply(Typers.scala:1690)
Error:scala.List$$.map2(List.scala:333)
Error:scala.tools.nsc.typechecker.Typers$$Typer.typedArgs(Typers.scala:1690)
Error:scala.tools.nsc.typechecker.Typers$$Typer.doTypedApply(Typers.scala:1774)
Error:scala.tools.nsc.typechecker.Typers$$Typer.typedApply$$1(Typers.scala:2657)
Error:scala.tools.nsc.typechecker.Typers$$Typer.typed1(Typers.scala:3257)
Error:scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3358)
Error:scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3395)
Error:scala.tools.nsc.transform.TailCalls$$TailCallElimination.rewriteTailCall(TailCalls.scala:321)
Error:scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:285)
Error:scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:232)
Error:scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:215)
Error:scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:144)
Error:scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:173)
Error:scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1478)
Error:scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transformStats$$1.apply(Trees.scala:1476)
Error:scala.List$$.loop$$1(List.scala:300)
Error:scala.List$$.mapConserve(List.scala:317)
Error:scala.tools.nsc.ast.Trees$$Transformer.transformStats(Trees.scala:1476)
Error:scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1384)
Error:scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:210)
Error:scala.tools.nsc.ast.Trees$$Transformer.transformTemplate(Trees.scala:1462)
Error:scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$2.apply(Trees.scala:1356)
Error:scala.tools.nsc.ast.Trees$$Transformer.atOwner(Trees.scala:1484)
Error:scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1355)
Error:scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:202)
Error:scala.tools.nsc.ast.Trees$$Transformer$$$$anonfun$$transform$$1.apply(Trees.scala:1352)
Error:scala.tools.nsc.ast.Trees$$Transformer.transform(Trees.scala:1351)
Error:scala.tools.nsc.transform.TailCalls$$TailCallElimination.transform(TailCalls.scala:198)
Error:scala.tools.nsc.ast.Trees$$Transformer.transformUnit(Trees.scala:1479)
Error:scala.tools.nsc.transform.TailCalls$$Phase.apply(TailCalls.scala:37)
Error:scala.tools.nsc.Global$$GlobalPhase.applyPhase(Global.scala:267)
Error:scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$run$$1.apply(Global.scala:246)
Error:scala.Iterator$$class.foreach(Iterator.scala:414)
Error:scala.collection.mutable.ListBuffer$$$$anon$$1.foreach(ListBuffer.scala:266)
Error:scala.tools.nsc.Global$$GlobalPhase.run(Global.scala:246)
Error:scala.tools.nsc.Global$$Run.compileSources(Global.scala:574)
Error:scala.tools.nsc.Global$$Run.compile(Global.scala:667)
Error:scala.tools.nsc.Main$$.process(Main.scala:73)
Error:scala.tools.nsc.Main$$.main(Main.scala:87)
Error:scala.tools.nsc.Main.main(Main.scala)

Observations:
Catching the value returned by the last line of the function getAncestor "if (c == p) p else c.b.getAncestor(c)" in a val and returning the val from the function allows the code fragment to compile successfully.
@scabug
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scabug commented May 26, 2009

Imported From: https://issues.scala-lang.org/browse/SI-2018?orig=1
Reporter: Don Mackenzie (donmackenzie)

@scabug
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scabug commented Apr 15, 2010

@paulp said:
(In r21599) Improved @tailrec error messages to specify the reason.
In the process fixed old bug involving tail call transformation.
Closes #3275, #2018. Review by dragos.

@scabug scabug closed this as completed May 18, 2011
@scabug scabug mentioned this issue Apr 7, 2017
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