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abgruszecki opened this issue Jan 17, 2019 · 10 comments
Closed

Assertion error with curiously-indirect F-bound using match types #5735

abgruszecki opened this issue Jan 17, 2019 · 10 comments
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@milessabin
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area:typer itype:crash

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@abgruszecki
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abgruszecki commented Jan 17, 2019 •
edited by Blaisorblade
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Below code triggers: denotation module class <empty> invalid in run 2. ValidFor: Period(1..66, run = 3)

scala> object Test {
     |   // The identity on types of the form N | P[a, P[b, ... P[z, N]]]
     |   type Nested[X, P[_, _], N] = X match {
     |     case N => N
     |     case P[a, b] => P[a, Nested[b, P, N]]
     |   }
     |
     |   class Foo[T] { def apply[Y >: T <: Nested[T, Tuple2, Unit]](t: T): T = t }
     |   def foo[T] = new Foo[T]
     | }
// defined object Test

scala> Test.foo.apply((21, ()))
assertion failure for (Int, Unit) <:< (Int, Unit) match {
  case Unit => Unit
  case [a, b] => ((a, b)) => (a, LazyRef(...))
}, frozen = false
assertion failure for (Int, Unit) <:< Test.Nested[(Int, Unit), Tuple2, Unit], frozen = false
assertion failure for (Int, Unit) <:< Test.Nested[(Int, Unit), Tuple2, Unit], frozen = false
error while transforming Test.foo[(Int, Unit)].apply[(Int, Unit)]
error while transforming Test.foo[(Int, Unit)].apply[(Int, Unit)](Tuple2.apply[Int, Unit](21, ()))
error while transforming val res0: (Int, Unit) =
  Test.foo[(Int, Unit)].apply[(Int, Unit)](Tuple2.apply[Int, Unit](21, ()))
error while transforming () extends Object() { this: rs$line$2.type =>
  val res0: (Int, Unit) =
    Test.foo[(Int, Unit)].apply[(Int, Unit)](Tuple2.apply[Int, Unit](21, ()))
}
error while transforming @scala.annotation.internal.SourceFile("rs$line$2") final module class rs$line$2(
  )
 extends Object() { this: rs$line$2.type =>
  val res0: (Int, Unit) =
    Test.foo[(Int, Unit)].apply[(Int, Unit)](Tuple2.apply[Int, Unit](21, ()))
}
error while transforming package <empty> {
  final lazy module val rs$line$2: rs$line$2 = new rs$line$2()
  @scala.annotation.internal.SourceFile("rs$line$2") final module class
    rs$line$2
  () extends Object() { this: rs$line$2.type =>
    val res0: (Int, Unit) =
      Test.foo[(Int, Unit)].apply[(Int, Unit)](Tuple2.apply[Int, Unit](21, ()))
  }
}
Exception in thread "main" java.lang.AssertionError: assertion failed: denotation module class <empty> invalid in run 2. ValidFor: Period(1..66, run = 3)
        at scala.Predef$.assert(Predef.scala:223)
        at dotty.tools.dotc.core.Denotations$SingleDenotation.updateValidity(Denotations.scala:824)
        at dotty.tools.dotc.core.Denotations$SingleDenotation.bringForward(Denotations.scala:847)
        at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:902)
        at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:482)
        at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:477)
        at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:471)
        at dotty.tools.dotc.core.SymDenotations.dotty$tools$dotc$core$SymDenotations$$stillValidInOwner(SymDenotations.scala:58)
        at dotty.tools.dotc.core.SymDenotations.dotty$tools$dotc$core$SymDenotations$$stillValidInOwner$(SymDenotations.scala:57)
        at dotty.tools.dotc.core.Contexts$Context.dotty$tools$dotc$core$SymDenotations$$stillValidInOwner(Contexts.scala:69)
        at dotty.tools.dotc.core.SymDenotations.stillValid(SymDenotations.scala:54)
        at dotty.tools.dotc.core.SymDenotations.stillValid$(SymDenotations.scala:46)
        at dotty.tools.dotc.core.Contexts$Context.stillValid(Contexts.scala:69)
        at dotty.tools.dotc.core.Denotations$SingleDenotation.bringForward(Denotations.scala:847)
        at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:902)
        at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:482)
        at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:477)
        at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:471)
        at dotty.tools.dotc.core.SymDenotations.dotty$tools$dotc$core$SymDenotations$$stillValidInOwner(SymDenotations.scala:58)
        at dotty.tools.dotc.core.SymDenotations.dotty$tools$dotc$core$SymDenotations$$stillValidInOwner$(SymDenotations.scala:57)
        at dotty.tools.dotc.core.Contexts$Context.dotty$tools$dotc$core$SymDenotations$$stillValidInOwner(Contexts.scala:69)
        at dotty.tools.dotc.core.SymDenotations.stillValid(SymDenotations.scala:54)
        at dotty.tools.dotc.core.SymDenotations.stillValid$(SymDenotations.scala:46)
        at dotty.tools.dotc.core.Contexts$Context.stillValid(Contexts.scala:69)
        at dotty.tools.dotc.core.Denotations$SingleDenotation.bringForward(Denotations.scala:847)
        at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:902)
        at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:482)
        at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:477)
        at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:471)
        at dotty.tools.dotc.core.SymDenotations.dotty$tools$dotc$core$SymDenotations$$stillValidInOwner(SymDenotations.scala:58)
        at dotty.tools.dotc.core.SymDenotations.dotty$tools$dotc$core$SymDenotations$$stillValidInOwner$(SymDenotations.scala:57)
        at dotty.tools.dotc.core.Contexts$Context.dotty$tools$dotc$core$SymDenotations$$stillValidInOwner(Contexts.scala:69)
        at dotty.tools.dotc.core.SymDenotations.stillValid(SymDenotations.scala:54)
        at dotty.tools.dotc.core.SymDenotations.stillValid$(SymDenotations.scala:46)
        at dotty.tools.dotc.core.Contexts$Context.stillValid(Contexts.scala:69)
        at dotty.tools.dotc.core.Symbols$Symbol.isValidInCurrentRun(Symbols.scala:507)
        at dotty.tools.dotc.core.Types$NamedType.computeSymbol(Types.scala:1749)
        at dotty.tools.dotc.core.Types$NamedType.symbol(Types.scala:1744)
        at dotty.tools.dotc.core.TypeApplications$.$anonfun$typeParams$extension$1(TypeApplications.scala:170)
        at dotty.tools.dotc.util.Stats$.track(Stats.scala:37)
        at dotty.tools.dotc.core.TypeApplications$.typeParams$extension(TypeApplications.scala:162)
        at dotty.tools.dotc.core.TypeApplications$.$anonfun$appliedTo$extension0$1(TypeApplications.scala:352)
        at dotty.tools.dotc.util.Stats$.track(Stats.scala:37)
        at dotty.tools.dotc.core.TypeApplications$.appliedTo$extension0(TypeApplications.scala:351)
        at dotty.tools.dotc.core.TypeApplications$.$anonfun$appliedTo$3(TypeApplications.scala:401)
        at dotty.tools.dotc.core.Types$LazyRef.ref(Types.scala:2416)
        at dotty.tools.dotc.core.Types$TypeMap.$anonfun$mapOver$8(Types.scala:4415)
        at dotty.tools.dotc.core.Types$LazyRef.ref(Types.scala:2416)
        at dotty.tools.dotc.core.Types$TypeMap.$anonfun$mapOver$8(Types.scala:4415)
        at dotty.tools.dotc.core.Types$LazyRef.ref(Types.scala:2416)
        at dotty.tools.dotc.core.Types$TypeMap.$anonfun$mapOver$8(Types.scala:4415)
        at dotty.tools.dotc.core.Types$LazyRef.ref(Types.scala:2416)
        at dotty.tools.dotc.core.Types$TypeMap.$anonfun$mapOver$8(Types.scala:4415)
        at dotty.tools.dotc.core.Types$LazyRef.ref(Types.scala:2416)
        at dotty.tools.dotc.core.Types$TypeMap.$anonfun$mapOver$8(Types.scala:4415)
        at dotty.tools.dotc.core.Types$LazyRef.ref(Types.scala:2416)
        at dotty.tools.dotc.core.Types$TypeMap.$anonfun$mapOver$8(Types.scala:4415)
        at dotty.tools.dotc.core.Types$LazyRef.ref(Types.scala:2416)
        at dotty.tools.dotc.core.Types$TypeMap.$anonfun$mapOver$8(Types.scala:4415)
        at dotty.tools.dotc.core.Types$LazyRef.ref(Types.scala:2416)
        at dotty.tools.dotc.core.Types$TypeMap.$anonfun$mapOver$8(Types.scala:4415)
        at dotty.tools.dotc.core.Types$LazyRef.ref(Types.scala:2416)
        at dotty.tools.dotc.core.Types$TypeMap.$anonfun$mapOver$8(Types.scala:4415)
        at dotty.tools.dotc.core.Types$LazyRef.ref(Types.scala:2416)
        at dotty.tools.dotc.core.TrackingTypeComparer$$anon$3.apply(TypeComparer.scala:1896)
        at dotty.tools.dotc.core.Types$TypeMap.$anonfun$mapOver$6(Types.scala:4370)
        at dotty.tools.dotc.core.Types$VariantTraversal.atVariance(Types.scala:4296)
        at dotty.tools.dotc.core.Types$TypeMap.mapArgs$1(Types.scala:4370)
        at dotty.tools.dotc.core.Types$TypeMap.mapArgs$1(Types.scala:4372)
        at dotty.tools.dotc.core.Types$TypeMap.mapOver(Types.scala:4378)
        at dotty.tools.dotc.core.TrackingTypeComparer$$anon$3.apply(TypeComparer.scala:1897)
        at dotty.tools.dotc.core.TrackingTypeComparer.$anonfun$matchCase$1(TypeComparer.scala:1916)
        at dotty.tools.dotc.core.ConstraintHandling.inFrozenConstraint(ConstraintHandling.scala:194)
        at dotty.tools.dotc.core.ConstraintHandling.inFrozenConstraint$(ConstraintHandling.scala:189)
        at dotty.tools.dotc.core.TypeComparer.inFrozenConstraint(TypeComparer.scala:27)
        at dotty.tools.dotc.core.TrackingTypeComparer.matchCase(TypeComparer.scala:1903)
        at dotty.tools.dotc.core.Types$MatchType.reduceSequential$1(Types.scala:3735)
        at dotty.tools.dotc.core.Types$MatchType.$anonfun$reduced$17(Types.scala:3792)
        at dotty.tools.dotc.reporting.trace$.apply(trace.scala:40)
        at dotty.tools.dotc.core.Types$MatchType.reduced(Types.scala:3788)
        at dotty.tools.dotc.core.TypeComparer.thirdTry$1(TypeComparer.scala:564)
        at dotty.tools.dotc.core.TypeComparer.secondTry$1(TypeComparer.scala:397)
        at dotty.tools.dotc.core.TypeComparer.firstTry$1(TypeComparer.scala:316)
        at dotty.tools.dotc.core.TypeComparer.$anonfun$recur$2(TypeComparer.scala:966)
        at scala.runtime.java8.JFunction0$mcZ$sp.apply(JFunction0$mcZ$sp.java:23)
        at dotty.tools.dotc.reporting.trace$.apply(trace.scala:40)
        at dotty.tools.dotc.reporting.trace$.apply(trace.scala:44)
        at dotty.tools.dotc.core.TypeComparer.recur(TypeComparer.scala:148)
        at dotty.tools.dotc.core.TypeComparer.isSubType(TypeComparer.scala:139)
        at dotty.tools.dotc.core.TypeComparer.isSubApproxHi$1(TypeComparer.scala:955)
        at dotty.tools.dotc.core.TypeComparer.$anonfun$recur$24(TypeComparer.scala:851)
        at dotty.tools.dotc.core.TypeComparer.either(TypeComparer.scala:1123)
        at dotty.tools.dotc.core.TypeComparer.fallback$1(TypeComparer.scala:851)
        at dotty.tools.dotc.core.TypeComparer.compareLower$1(TypeComparer.scala:867)
        at dotty.tools.dotc.core.TypeComparer.compareAppliedType2$1(TypeComparer.scala:879)
        at dotty.tools.dotc.core.TypeComparer.thirdTry$1(TypeComparer.scala:438)
        at dotty.tools.dotc.core.TypeComparer.secondTry$1(TypeComparer.scala:397)
        at dotty.tools.dotc.core.TypeComparer.firstTry$1(TypeComparer.scala:316)
        at dotty.tools.dotc.core.TypeComparer.$anonfun$recur$2(TypeComparer.scala:966)
        at scala.runtime.java8.JFunction0$mcZ$sp.apply(JFunction0$mcZ$sp.java:23)
        at dotty.tools.dotc.reporting.trace$.apply(trace.scala:40)
        at dotty.tools.dotc.reporting.trace$.apply(trace.scala:44)
        at dotty.tools.dotc.core.TypeComparer.recur(TypeComparer.scala:148)
        at dotty.tools.dotc.core.TypeComparer.secondTry$1(TypeComparer.scala:362)
        at dotty.tools.dotc.core.TypeComparer.firstTry$1(TypeComparer.scala:316)
        at dotty.tools.dotc.core.TypeComparer.$anonfun$recur$2(TypeComparer.scala:966)
        at scala.runtime.java8.JFunction0$mcZ$sp.apply(JFunction0$mcZ$sp.java:23)
        at dotty.tools.dotc.reporting.trace$.apply(trace.scala:40)
        at dotty.tools.dotc.reporting.trace$.apply(trace.scala:44)
        at dotty.tools.dotc.core.TypeComparer.recur(TypeComparer.scala:148)
        at dotty.tools.dotc.core.TypeComparer.isSubType(TypeComparer.scala:139)
        at dotty.tools.dotc.core.TypeComparer.isSubType(TypeComparer.scala:146)
        at dotty.tools.dotc.core.TypeComparer.topLevelSubType(TypeComparer.scala:125)
        at dotty.tools.dotc.core.Types$Type.$anonfun$$less$colon$less$1(Types.scala:824)
        at scala.runtime.java8.JFunction0$mcZ$sp.apply(JFunction0$mcZ$sp.java:23)
        at dotty.tools.dotc.util.Stats$.track(Stats.scala:37)
        at dotty.tools.dotc.core.Types$Type.$less$colon$less(Types.scala:824)
        at dotty.tools.dotc.core.TypeOps.checkOverlapsBounds$1(TypeOps.scala:265)
        at dotty.tools.dotc.core.TypeOps.$anonfun$boundsViolations$2(TypeOps.scala:270)
        at dotty.tools.dotc.core.TypeOps.$anonfun$boundsViolations$2$adapted(TypeOps.scala:257)
        at scala.collection.TraversableLike$WithFilter.$anonfun$foreach$1(TraversableLike.scala:792)
        at scala.collection.immutable.List.foreach(List.scala:392)
        at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:791)
        at dotty.tools.dotc.core.TypeOps.boundsViolations(TypeOps.scala:257)
        at dotty.tools.dotc.core.TypeOps.boundsViolations$(TypeOps.scala:254)
        at dotty.tools.dotc.core.Contexts$Context.boundsViolations(Contexts.scala:69)
        at dotty.tools.dotc.typer.Checking$.checkBounds(Checking.scala:47)
        at dotty.tools.dotc.typer.Checking$.checkBounds(Checking.scala:58)
        at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:231)
        at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1223)
        at dotty.tools.dotc.transform.MacroTransform$Transformer.transform(MacroTransform.scala:62)
        at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:225)
        at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1290)
        at dotty.tools.dotc.transform.MacroTransform$Transformer.transform(MacroTransform.scala:54)
        at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:253)
        at dotty.tools.dotc.transform.MacroTransform$Transformer.transformStat$1(MacroTransform.scala:42)
        at dotty.tools.dotc.transform.MacroTransform$Transformer.$anonfun$transformStats$1(MacroTransform.scala:45)
        at dotty.tools.dotc.core.Decorators$ListDecorator$.loop$1(Decorators.scala:62)
        at dotty.tools.dotc.core.Decorators$ListDecorator$.mapconserve$extension(Decorators.scala:78)
        at dotty.tools.dotc.transform.MacroTransform$Transformer.transformStats(MacroTransform.scala:45)
        at dotty.tools.dotc.transform.MacroTransform$Transformer.transform(MacroTransform.scala:60)
        at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.super$transform(PostTyper.scala:223)
        at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.$anonfun$transform$5(PostTyper.scala:249)
        at dotty.tools.dotc.transform.SuperAccessors.wrapTemplate(SuperAccessors.scala:177)
        at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.$anonfun$transform$4(PostTyper.scala:248)
        at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.withNoCheckNews(PostTyper.scala:90)
        at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:245)
        at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1297)
        at dotty.tools.dotc.transform.MacroTransform$Transformer.transform(MacroTransform.scala:54)
        at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:267)
        at dotty.tools.dotc.ast.Trees$Instance$TreeMap.$anonfun$transform$6(Trees.scala:1317)
        at scala.collection.immutable.List.mapConserve(List.scala:179)
        at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1317)
        at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transformStats(Trees.scala:1315)
        at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1303)
        at dotty.tools.dotc.transform.MacroTransform$Transformer.transform(MacroTransform.scala:54)
        at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:324)
        at dotty.tools.dotc.transform.MacroTransform.run(MacroTransform.scala:21)
        at dotty.tools.dotc.core.Phases$Phase.$anonfun$runOn$1(Phases.scala:297)
        at scala.collection.immutable.List.map(List.scala:286)
        at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:295)
        at dotty.tools.dotc.Run.$anonfun$compileUnits$3(Run.scala:172)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
        at dotty.tools.dotc.util.Stats$.trackTime(Stats.scala:49)
        at dotty.tools.dotc.Run.$anonfun$compileUnits$2(Run.scala:169)
        at dotty.tools.dotc.Run.$anonfun$compileUnits$2$adapted(Run.scala:167)
        at scala.collection.IndexedSeqOptimized.foreach(IndexedSeqOptimized.scala:36)
        at scala.collection.IndexedSeqOptimized.foreach$(IndexedSeqOptimized.scala:33)
        at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:198)
        at dotty.tools.dotc.Run.runPhases$1(Run.scala:167)
        at dotty.tools.dotc.Run.$anonfun$compileUnits$1(Run.scala:192)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
        at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:90)
        at dotty.tools.dotc.Run.compileUnits(Run.scala:147)
        at dotty.tools.dotc.Run.compileUnits(Run.scala:139)
        at dotty.tools.repl.ReplCompiler.runCompilationUnit(ReplCompiler.scala:151)
        at dotty.tools.repl.ReplCompiler.compile(ReplCompiler.scala:160)
        at dotty.tools.repl.ReplDriver.compile(ReplDriver.scala:213)
        at dotty.tools.repl.ReplDriver.interpret(ReplDriver.scala:182)
        at dotty.tools.repl.ReplDriver.loop$1(ReplDriver.scala:127)
        at dotty.tools.repl.ReplDriver.$anonfun$runUntilQuit$2(ReplDriver.scala:130)
        at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62)
        at scala.Console$.withErr(Console.scala:196)
        at dotty.tools.repl.ReplDriver.$anonfun$withRedirectedOutput$1(ReplDriver.scala:143)
        at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62)
        at scala.Console$.withOut(Console.scala:167)
        at dotty.tools.repl.ReplDriver.withRedirectedOutput(ReplDriver.scala:143)
        at dotty.tools.repl.ReplDriver.runUntilQuit(ReplDriver.scala:130)
        at dotty.tools.repl.Main$.main(Main.scala:6)
        at dotty.tools.repl.Main.main(Main.scala)

Note that Test.foo.apply(()) works.

/cc @smarter
@abgruszecki
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abgruszecki commented Jan 17, 2019 •
edited
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Or /cc @OlivierBlanvillain? (match types)

@abgruszecki abgruszecki mentioned this issue Jan 17, 2019
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@abgruszecki abgruszecki changed the title Assertion error with semi-F-bound using a match type Assertion error with curiously-indirect F-bound using match types Jan 17, 2019
@Blaisorblade
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Marked as blocker (tentatively) because the error is so scary.

@smarter
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smarter commented Jan 23, 2019

I think blockers should be assigned to a specific milestone, otherwise it's not clear what they're blocking exactly. Also for a crash to be a blocker it should be something that is likely to impact a lot of people, so I don't think this qualifies.

@Blaisorblade
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Ok! My reasoning was, this should block 1.0 until we figure the bug is not in fundamental code. But we don’t have that milestone, so unlabeled!

@odersky
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odersky commented Jan 24, 2019

The error is that somebody is looking at the package in run 2, when the current run is 3. Backwards timetravel is not allowed, hence the error.

How to fix this: Two possibilities: (1) Find out what causes the jump to run 2, and eliminate it. Most likely it's some cached context. Or, (2), allow backwards timetravel for package denotations. I am less sure about this one, since it might hide real errors so I'd prefer (1) if that works out.

@odersky
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odersky commented Jan 24, 2019

Who wants to give this a try?

@milessabin
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I'd like to when I have a moment ...

@milessabin
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This appears to be fixed. Needs test case to close.

@smarter smarter closed this as completed in 0f79124 Mar 5, 2019
smarter added a commit that referenced this issue Mar 5, 2019
@smarter
Merge pull request #6022 from dotty-staging/close-5735
3185338 
Close #5735: Add regression test
@travisbrown
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@smarter Do you happen to know what resolved this? I'm seeing similar errors on 0.22.0-RC1 and recent nightlies when calling inline methods in a trait with an F-bound. My quick attempt to minimize didn't work (the piece of code that's failing in my sbt project seems fine when pulled out and compiled with dotc).

@smarter
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smarter commented Feb 23, 2020

I don't, it might be that the root cause is the same and the test case now works by accident if it's related to caching as mentioned above.

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@smarter @milessabin @Blaisorblade @travisbrown @odersky @abgruszecki