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Crash (regression): dotty.tools.dotc.core.Denotations$StaleSymbol: stale symbol  #17152

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#18077
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Crash (regression): dotty.tools.dotc.core.Denotations$StaleSymbol: stale symbol #17152
#18077
Labels
area:typeritype:bugitype:crashregressionThis worked in a previous version but doesn't anymore
Milestone
 
3.4.0
@soronpo

Description

@soronpo
soronpo
opened on Mar 26, 2023

Regression introduced in #17088 causes a crash

Compiler version

From this version onward
v3.3.1-RC1-bin-20230312-89a744f-NIGHTLY

Minimized code

DFVal.scala

package crash

trait TCConv[T <: DFTypeAny, V, O]:
  type Out <: O
  def conv(dfType: T, value: V): Out

class DFVal[+T <: DFTypeAny]
type DFValAny = DFVal[DFTypeAny]
type DFValOf[+T <: DFTypeAny] = DFVal[T]

object DFVal:
  trait TC[T <: DFTypeAny, R] extends TCConv[T, R, DFValAny]:
    type Out = DFValOf[T]
    final def apply(dfType: T, value: R): Out = ???

  object TC:
    export CompanionsDFBits.Val.TC.given
  end TC

  object Ops:
    extension [T <: DFTypeAny, A, C, I](dfVal: DFVal[T])
      def bits(using w: Width[T]): DFValOf[DFBits[w.Out]] = ???
    end extension
  end Ops
end DFVal

DFBits.scala

package crash

import scala.quoted.*

class IRDFType
class IRDFBoolOrBit extends IRDFType
class IRDFDecimal extends IRDFType
class IRDFBits extends IRDFType

final class DFType[+T <: IRDFType, +A]
type DFTypeAny = DFType[IRDFType, Any]

trait Baz

trait Width[T]:
  type Out <: Int
object Width:
  given fromDFBoolOrBit[T <: DFBoolOrBit]: Width[T] with
    type Out = 1
  transparent inline given [T]: Width[T] = ${ getWidthMacro[T] }
  def getWidthMacro[T](using Quotes, Type[T]): Expr[Width[T]] =
    '{
      new Width[T]:
        type Out = 1
    }
end Width

extension [T](t: T)(using baz: Baz) def width: 1 = ???

trait Check[T1 <: Int, T2 <: Int]

type DFBits[W <: Int] = DFType[IRDFBits, Tuple1[W]]

private object CompanionsDFBits:
  object Val:
    trait Candidate[R]:
      type OutW <: Int
      def apply(value: R): DFValOf[DFBits[OutW]]
    object Candidate:
      given fromDFUInt[W <: Int, R <: DFValOf[DFDecimal]]: Candidate[R] with
        type OutW = W
        def apply(value: R): DFValOf[DFBits[W]] =
          import DFVal.Ops.bits
          value.bits
          ???
    end Candidate

    object TC:
      import DFVal.TC
      given DFBitsFromCandidate[
          LW <: Int,
          V
      ](using candidate: Candidate[V])(using
          check: Check[LW, candidate.OutW]
      ): TC[DFBits[LW], V] with
        def conv(dfType: DFBits[LW], value: V): DFValOf[DFBits[LW]] =
          val dfVal = candidate(value)
          ???
    end TC
  end Val

end CompanionsDFBits

type DFBoolOrBit = DFType[IRDFBoolOrBit, Any]
type DFDecimal = DFType[IRDFDecimal, Any]
object DFDecimal:
  def foo(arg1: Int, arg2: Int): Unit = ???

  object Val:
    object TC:
      import DFVal.TC
      given [R]: TC[DFDecimal, R] = ???
      def apply(
          dfType: DFDecimal,
          dfVal: DFValOf[DFDecimal]
      ): DFValOf[DFDecimal] =
        foo(dfType.width, dfVal.width)
        dfVal
    end TC
  end Val
end DFDecimal

Output (click arrow to expand)

[error] ## Exception when compiling 2 sources to C:\example\target\scala-3.3.1-RC1-bin-20230325-dcf5f9d-NIGHTLY\classes
[error] dotty.tools.dotc.core.Denotations$StaleSymbol: stale symbol; type Out#6462 in trait Width, defined in Period(1..62, run = 2), is referred to in run Period(2..2, run = 3)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.staleSymbolError(Denotations.scala:948)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.bringForward(Denotations.scala:752)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.toNewRun$1(Denotations.scala:799)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:870)
[error] dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:120)
[error] dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:114)
[error] dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:107)
[error] dotty.tools.dotc.core.Symbols$.toDenot(Symbols.scala:494)
[error] dotty.tools.dotc.core.Types$NamedType.derivedSelect(Types.scala:2657)
[error] dotty.tools.dotc.core.Substituters$.subst(Substituters.scala:18)
[error] dotty.tools.dotc.core.Substituters$.mapArgs$1(Substituters.scala:22)
[error] dotty.tools.dotc.core.Substituters$.subst(Substituters.scala:22)
[error] dotty.tools.dotc.core.Substituters$.mapArgs$1(Substituters.scala:22)
[error] dotty.tools.dotc.core.Substituters$.subst(Substituters.scala:22)
[error] dotty.tools.dotc.core.Types$Type.subst(Types.scala:1798)
[error] dotty.tools.dotc.core.Types$LambdaType.newLikeThis$$anonfun$2(Types.scala:3679)
[error] dotty.tools.dotc.core.Types$MethodType.<init>(Types.scala:3934)
[error] dotty.tools.dotc.core.Types$CachedMethodType.<init>(Types.scala:3953)
[error] dotty.tools.dotc.core.Types$MethodTypeCompanion.apply(Types.scala:4045)
[error] dotty.tools.dotc.core.Types$MethodTypeCompanion.apply(Types.scala:4044)
[error] dotty.tools.dotc.core.Types$LambdaType.newLikeThis(Types.scala:3679)
[error] dotty.tools.dotc.core.Types$LambdaType.newLikeThis$(Types.scala:3606)
[error] dotty.tools.dotc.core.Types$MethodOrPoly.newLikeThis(Types.scala:3692)
[error] dotty.tools.dotc.core.Types$LambdaType.derivedLambdaType(Types.scala:3669)
[error] dotty.tools.dotc.core.Types$LambdaType.derivedLambdaType$(Types.scala:3606)
[error] dotty.tools.dotc.core.Types$MethodOrPoly.derivedLambdaType(Types.scala:3692)
[error] dotty.tools.dotc.core.Types$TypeMap.derivedLambdaType(Types.scala:5655)
[error] dotty.tools.dotc.core.Types$TypeMap.mapOverLambda(Types.scala:5674)
[error] dotty.tools.dotc.core.Types$TypeMap.mapOver(Types.scala:5701)
[error] dotty.tools.dotc.core.Substituters$.substParams(Substituters.scala:163)
[error] dotty.tools.dotc.core.Substituters$SubstParamsMap.apply(Substituters.scala:201)
[error] dotty.tools.dotc.core.Types$TypeMap.mapOverLambda(Types.scala:5674)
[error] dotty.tools.dotc.core.Types$TypeMap.mapOver(Types.scala:5701)
[error] dotty.tools.dotc.core.Substituters$.substParams(Substituters.scala:163)
[error] dotty.tools.dotc.core.Types$Type.substParams(Types.scala:1818)
[error] dotty.tools.dotc.core.Types$LambdaType.instantiate(Types.scala:3645)
[error] dotty.tools.dotc.core.Types$LambdaType.instantiate$(Types.scala:3606)
[error] dotty.tools.dotc.core.Types$MethodOrPoly.instantiate(Types.scala:3692)
[error] dotty.tools.dotc.typer.TypeAssigner.assignType(TypeAssigner.scala:360)
[error] dotty.tools.dotc.typer.TypeAssigner.assignType$(TypeAssigner.scala:16)
[error] dotty.tools.dotc.typer.Typer.assignType(Typer.scala:116)
[error] dotty.tools.dotc.ast.tpd$.TypeApply(tpd.scala:58)
[error] dotty.tools.dotc.ast.tpd$TreeOps$.appliedToTypeTrees$extension(tpd.scala:979)
[error] dotty.tools.dotc.typer.Typer.adapt1(Typer.scala:4153)
[error] dotty.tools.dotc.typer.Typer.adapt(Typer.scala:3485)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3108)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3112)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3224)
[error] dotty.tools.dotc.typer.Applications.realApply$1(Applications.scala:941)
[error] dotty.tools.dotc.typer.Applications.typedApply(Applications.scala:1101)
[error] dotty.tools.dotc.typer.Applications.typedApply$(Applications.scala:352)
[error] dotty.tools.dotc.typer.Typer.typedApply(Typer.scala:116)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2973)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3036)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3108)
[error] dotty.tools.dotc.typer.Applications.extMethodApply(Applications.scala:2368)
[error] dotty.tools.dotc.typer.Applications.extMethodApply$(Applications.scala:352)
[error] dotty.tools.dotc.typer.Typer.extMethodApply(Typer.scala:116)
[error] dotty.tools.dotc.typer.Typer.tryExtension$1(Typer.scala:3396)
[error] dotty.tools.dotc.typer.Typer.tryExtensionOrConversion(Typer.scala:3409)
[error] dotty.tools.dotc.typer.Typer.typedSelect(Typer.scala:644)
[error] dotty.tools.dotc.typer.Typer.typeSelectOnTerm$1(Typer.scala:694)
[error] dotty.tools.dotc.typer.Typer.typedSelect(Typer.scala:731)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2942)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3035)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3108)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3112)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3161)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3180)
[error] dotty.tools.dotc.typer.Typer.typedBlockStats(Typer.scala:1100)
[error] dotty.tools.dotc.typer.Typer.typedBlock(Typer.scala:1104)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2981)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3036)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3108)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3112)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3224)
[error] dotty.tools.dotc.typer.Typer.$anonfun$57(Typer.scala:2411)
[error] dotty.tools.dotc.inlines.PrepareInlineable$.dropInlineIfError(PrepareInlineable.scala:250)
[error] dotty.tools.dotc.typer.Typer.typedDefDef(Typer.scala:2411)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2949)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3035)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3108)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3112)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3134)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3180)
[error] dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:2594)
[error] dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$1(Typer.scala:2961)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2965)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3035)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3108)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3112)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3134)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3180)
[error] dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:2594)
[error] dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$1(Typer.scala:2961)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2965)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3035)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3108)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3112)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3134)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3180)
[error] dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:2594)
[error] dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$1(Typer.scala:2961)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2965)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3035)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3108)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3112)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3134)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3180)
[error] dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:2594)
[error] dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$1(Typer.scala:2961)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2965)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3035)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3108)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3112)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3134)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3180)
[error] dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:2737)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3006)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3036)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3108)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3112)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3224)
[error] dotty.tools.dotc.typer.TyperPhase.typeCheck$$anonfun$1(TyperPhase.scala:44)
[error] dotty.tools.dotc.typer.TyperPhase.typeCheck$$anonfun$adapted$1(TyperPhase.scala:54)
[error] scala.Function0.apply$mcV$sp(Function0.scala:42)
[error] dotty.tools.dotc.core.Phases$Phase.monitor(Phases.scala:437)
[error] dotty.tools.dotc.typer.TyperPhase.typeCheck(TyperPhase.scala:54)
[error] dotty.tools.dotc.typer.TyperPhase.runOn$$anonfun$3(TyperPhase.scala:88)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.typer.TyperPhase.runOn(TyperPhase.scala:88)
[error] dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:246)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1321)
[error] dotty.tools.dotc.Run.runPhases$1(Run.scala:262)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:270)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:279)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:279)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:200)
[error] dotty.tools.dotc.Driver.finish(Driver.scala:58)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:38)
[error] dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:88)
[error] dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:193)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:248)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:183)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:163)
[error] sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:163)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:211)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:179)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:177)
[error] sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:463)
[error] sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:263)
[error] sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:418)
[error] sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:506)
[error] sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:405)
[error] sbt.internal.inc.Incremental$.apply(Incremental.scala:171)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:488)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:425)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2363)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2313)
[error] sbt.internal.server.BspCompileTask$.$anonfun$compute$1(BspCompileTask.scala:30)
[error] sbt.internal.io.Retry$.apply(Retry.scala:46)
[error] sbt.internal.io.Retry$.apply(Retry.scala:28)
[error] sbt.internal.io.Retry$.apply(Retry.scala:23)
[error] sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:30)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2311)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error] sbt.std.Transform$$anon$4.work(Transform.scala:68)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:282)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:23)
[error] sbt.Execute.work(Execute.scala:291)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:282)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:64)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
[error] java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
[error] java.base/java.lang.Thread.run(Thread.java:831)
[error]
[error] stack trace is suppressed; run last core / Compile / compileIncremental for the full output
[error] (core / Compile / compileIncremental) dotty.tools.dotc.core.Denotations$StaleSymbol: stale symbol; type Out#6462 in trait Width, defined in Period(1..62, run = 2), is referred to in run Period(2..2, run = 3)

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