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bishabosha opened this issue Aug 28, 2020 · 0 comments · Fixed by #9673
Closed

local trait in class parent has no prefix #9670

bishabosha opened this issue Aug 28, 2020 · 0 comments · Fixed by #9673
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@liufengyun
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itype:bug itype:crash
Milestone
3.0.0

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@bishabosha
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bishabosha commented Aug 28, 2020 •
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Minimized code

// compile with -Ycheck-init
object Outer {
  def foo = {
    trait Mixin
    class E extends Mixin
    object SomeObject {
      val A = E()
    }
  }
}

Output (click arrow to expand)

exception occurred while compiling sandbox/lazy/mixinobject.scala
java.lang.Exception: unexpected type: <noprefix> while compiling sandbox/lazy/mixinobject.scala
Exception in thread "main" java.lang.Exception: unexpected type: <noprefix>
	at dotty.tools.dotc.transform.init.Summarization$.op$proxy2$1(Summarization.scala:243)
	at dotty.tools.dotc.transform.init.Summarization$.analyze(Summarization.scala:248)
	at dotty.tools.dotc.transform.init.Summarization$.$anonfun$9(Summarization.scala:312)
	at scala.collection.LinearSeqOps.foldLeft(LinearSeq.scala:168)
	at scala.collection.LinearSeqOps.foldLeft$(LinearSeq.scala:164)
	at scala.collection.immutable.List.foldLeft(List.scala:79)
	at dotty.tools.dotc.transform.init.Summarization$.op$proxy4$1(Summarization.scala:315)
	at dotty.tools.dotc.transform.init.Summarization$.analyzeConstructor(Summarization.scala:324)
	at dotty.tools.dotc.transform.init.Summary$ClassSummary.op$proxy1$1(Summary.scala:38)
	at dotty.tools.dotc.transform.init.Summary$ClassSummary.summaryOf(Summary.scala:46)
	at dotty.tools.dotc.transform.init.Summary$ClassSummary.effectsOf(Summary.scala:48)
	at dotty.tools.dotc.transform.init.Potentials$Warm.op$proxy3$1(Potentials.scala:77)
	at dotty.tools.dotc.transform.init.Potentials$Warm.effectsOf(Potentials.scala:79)
	at dotty.tools.dotc.transform.init.Checking$.op$proxy1$1(Checking.scala:241)
	at dotty.tools.dotc.transform.init.Checking$.check(Checking.scala:262)
	at dotty.tools.dotc.transform.init.Checking$.checkEffectsIn$$anonfun$3$$anonfun$2(Checking.scala:146)
	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.immutable.Set$Set1.foreach(Set.scala:168)
	at dotty.tools.dotc.transform.init.Checking$.checkEffectsIn$$anonfun$1(Checking.scala:147)
	at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
	at dotty.tools.dotc.transform.init.Util$.traceOp(Util.scala:18)
	at dotty.tools.dotc.transform.init.Checking$.checkEffectsIn(Checking.scala:148)
	at dotty.tools.dotc.transform.init.Checking$.checkClassBodyStat$1$$anonfun$1(Checking.scala:71)
	at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
	at dotty.tools.dotc.transform.init.Util$.traceOp(Util.scala:18)
	at dotty.tools.dotc.transform.init.Checking$.checkClassBodyStat$2(Checking.scala:80)
	at dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$3(Checking.scala:140)
	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.immutable.List.foreach(List.scala:333)
	at dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:140)
	at dotty.tools.dotc.transform.init.Checker.transformTypeDef(Checker.scala:58)
	at dotty.tools.dotc.transform.MegaPhase.goTypeDef(MegaPhase.scala:988)
	at dotty.tools.dotc.transform.MegaPhase.goTypeDef(MegaPhase.scala:989)
	at dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:256)
	at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:426)
	at dotty.tools.dotc.transform.MegaPhase.transformStat$2(MegaPhase.scala:436)
	at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:441)
	at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:1060)
	at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:1060)
	at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:1060)
	at dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:441)
	at dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:298)
	at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:428)
	at dotty.tools.dotc.transform.MegaPhase.mapDefDef$1(MegaPhase.scala:248)
	at dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:251)
	at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:426)
	at dotty.tools.dotc.transform.MegaPhase.transformStat$2(MegaPhase.scala:436)
	at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:441)
	at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:1060)
	at dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:441)
	at dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:361)
	at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:428)
	at dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:255)
	at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:426)
	at dotty.tools.dotc.transform.MegaPhase.transformStat$2(MegaPhase.scala:436)
	at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:441)
	at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:1060)
	at dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:441)
	at dotty.tools.dotc.transform.MegaPhase.mapPackage$1(MegaPhase.scala:381)
	at dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:384)
	at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:428)
	at dotty.tools.dotc.transform.MegaPhase.transformUnit(MegaPhase.scala:447)
	at dotty.tools.dotc.transform.MegaPhase.run(MegaPhase.scala:459)
	at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:296)
	at scala.collection.immutable.List.map(List.scala:246)
	at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:297)
	at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:180)
	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
	at dotty.tools.dotc.Run.runPhases$5(Run.scala:190)
	at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:198)
	at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
	at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:64)
	at dotty.tools.dotc.Run.compileUnits(Run.scala:205)
	at dotty.tools.dotc.Run.compileSources(Run.scala:142)
	at dotty.tools.dotc.Run.compile(Run.scala:124)
	at dotty.tools.dotc.Driver.doCompile(Driver.scala:38)
	at dotty.tools.dotc.Driver.process(Driver.scala:195)
	at dotty.tools.dotc.Driver.process(Driver.scala:164)
	at dotty.tools.dotc.Driver.process(Driver.scala:176)
	at dotty.tools.dotc.Driver.main(Driver.scala:203)
	at dotty.tools.dotc.Main.main(Main.scala)

When A is defined in an object and Mixin is a parent to E then the reference to Mixin has no prefix, it would seem that Mixin should have a prefix because there is no crash when it is changed to an abstract class
@bishabosha bishabosha changed the title -Ycheck-init crash when mixin local trait local trait in class parent has no prefix Aug 28, 2020
@liufengyun liufengyun self-assigned this Aug 28, 2020
liufengyun added a commit to dotty-staging/dotty that referenced this issue Aug 28, 2020
@liufengyun
Fix scala#9670: handle local class in parent effects
dcd1ae7
@liufengyun liufengyun mentioned this issue Aug 28, 2020
Merged
bishabosha added a commit that referenced this issue Sep 2, 2020
@bishabosha
Merge pull request #9673 from dotty-staging/fix-9670
039f84e 
Fix #9670: handle local class in parent effects
@Kordyjan Kordyjan added this to the 3.0.0 milestone Aug 2, 2023
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Fix #9670: handle local class in parent effects dotty-staging/dotty
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@liufengyun @Kordyjan @bishabosha