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flomebul opened this issue Feb 18, 2021 · 1 comment · Fixed by #11478
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compiler crash "exception while typing" ... "scala.MatchError"... #11466

flomebul opened this issue Feb 18, 2021 · 1 comment · Fixed by #11478
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@liufengyun
Labels
area:implicits related to implicits itype:bug
Milestone
3.0.0

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@flomebul
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flomebul commented Feb 18, 2021 •
edited
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Compiler version

scala version 3.0.0-RC1

Minimized code

In the following code, the line val m = new Node("Alice") is supposed to give a compile error, but a compiler crash is obtained.

open class GraphDB[Id]:
  class Node private[GraphDB](val id: Id)
end GraphDB

import org.scalatest.flatspec.AnyFlatSpec

object GraphDBSpec extends AnyFlatSpec:
  object graph extends GraphDB[String]
  import graph.*
  val m = new Node("Alice")
end GraphDBSpec

Output

exception while typing asuivre.GraphDBSpec.convertToEqualizer[Object](
  new asuivre.GraphDBSpec.graph.Node
)[Object]("Alice") of class class dotty.tools.dotc.ast.Trees$Apply # -1
exception while typing def m: asuivre.GraphDBSpec.Equalizer[Object] = 
  asuivre.GraphDBSpec.convertToEqualizer[Object](
    new asuivre.GraphDBSpec.graph.Node
  )[Object]("Alice") of class class dotty.tools.dotc.ast.Trees$DefDef # -1
exception while typing @scala.annotation.internal.SourceFile(
  "asuivre/src/main/scala/asuivre/Issue99990.scala"
) final module class GraphDBSpec$() extends org.scalatest.flatspec.AnyFlatSpec()
   {
  private def writeReplace(): AnyRef = 
    new scala.runtime.ModuleSerializationProxy(classOf[asuivre.GraphDBSpec.type]
      )
  final lazy module val graph: asuivre.GraphDBSpec.graph$ = 
    new asuivre.GraphDBSpec.graph$()
  final module class graph$() extends asuivre.GraphDB[String]() {
    private def writeReplace(): AnyRef = 
      new scala.runtime.ModuleSerializationProxy(
        classOf[asuivre.GraphDBSpec.graph.type]
      )
  }
  def m: asuivre.GraphDBSpec.Equalizer[Object] = 
    asuivre.GraphDBSpec.convertToEqualizer[Object](
      new asuivre.GraphDBSpec.graph.Node
    )[Object]("Alice")
} of class class dotty.tools.dotc.ast.Trees$TypeDef # -1
exception while typing package asuivre {
  @scala.annotation.internal.SourceFile(
    "asuivre/src/main/scala/asuivre/Issue99990.scala"
  ) open class GraphDB[Id]() extends Object() {
    private type Id
    class Node private[GraphDB](id: Id) extends Object() {
      def id: Id
      private val $outer: asuivre.GraphDB[Id]
      final def asuivre$GraphDB$Node$$$outer: asuivre.GraphDB[Id] = 
        Node.this.$outer
    }
  }
  final lazy module val GraphDBSpec: asuivre.GraphDBSpec$ = 
    new asuivre.GraphDBSpec$()
  @scala.annotation.internal.SourceFile(
    "asuivre/src/main/scala/asuivre/Issue99990.scala"
  ) final module class GraphDBSpec$() extends org.scalatest.flatspec.AnyFlatSpec
    (
  ) {
    private def writeReplace(): AnyRef = 
      new scala.runtime.ModuleSerializationProxy(
        classOf[asuivre.GraphDBSpec.type]
      )
    final lazy module val graph: asuivre.GraphDBSpec.graph$ = 
      new asuivre.GraphDBSpec.graph$()
    final module class graph$() extends asuivre.GraphDB[String]() {
      private def writeReplace(): AnyRef = 
        new scala.runtime.ModuleSerializationProxy(
          classOf[asuivre.GraphDBSpec.graph.type]
        )
    }
    def m: asuivre.GraphDBSpec.Equalizer[Object] = 
      asuivre.GraphDBSpec.convertToEqualizer[Object](
        new asuivre.GraphDBSpec.graph.Node
      )[Object]("Alice")
  }
} of class class dotty.tools.dotc.ast.Trees$PackageDef # -1
[info] exception occurred while compiling D:\Users\Luc\Documents\Home\ProjCode\Scala_3.0\asuivre\src\main\scala\asuivre\Issue99990.scala
scala.MatchError: Apply(TypeApply(Ident(convertToEqualizer),List(TypeTree[TypeVar(TypeParamRef(T) -> TypeRef(ThisType(TypeRef(NoPrefix,module class lang)),class Object))])),List(New(TypeTree[TypeRef(TermRef(ThisType(TypeRef(ThisType(TypeRef(NoPrefix,module class asuivre)),module class GraphDBSpec$)),object graph),class Node)]))) (of class dotty.tools.dotc.ast.Trees$Apply) while compiling D:\Users\Luc\Documents\Home\ProjCode\Scala_3.0\asuivre\src\main\scala\asuivre\Issue99990.scala
[error] ## Exception when compiling 5 sources to D:\Users\Luc\Documents\Home\ProjCode\Scala_3.0\asuivre\target\scala-3.0.0-RC1\classes
[error] scala.MatchError: Apply(TypeApply(Ident(convertToEqualizer),List(TypeTree[TypeVar(TypeParamRef(T) -> TypeRef(ThisType(TypeRef(NoPrefix,module class lang)),class Object))])),List(New(TypeTree[TypeRef(TermRef(ThisType(TypeRef(ThisType(TypeRef(NoPrefix,module class asuivre)),module class GraphDBSpec$)),object graph),class Node)]))) (of class dotty.tools.dotc.ast.Trees$Apply)
[error] dotty.tools.dotc.transform.ExplicitOuter$OuterOps$.outerArg$1(ExplicitOuter.scala:381)
[error] dotty.tools.dotc.transform.ExplicitOuter$OuterOps$.args$extension(ExplicitOuter.scala:385)
[error] dotty.tools.dotc.transform.Erasure$Typer.typedApply(Erasure.scala:824)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2593)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2655)
[error] dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:118)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2720)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2724)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2840)
[error] dotty.tools.dotc.typer.Typer.$anonfun$35(Typer.scala:2080)
[error] dotty.tools.dotc.typer.PrepareInlineable$.dropInlineIfError(PrepareInlineable.scala:223)
[error] dotty.tools.dotc.typer.Typer.typedDefDef(Typer.scala:2080)
[error] dotty.tools.dotc.transform.Erasure$Typer.typedDefDef(Erasure.scala:929)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2570)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2654)
[error] dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:118)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2720)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2724)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2746)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2796)
[error] dotty.tools.dotc.transform.Erasure$Typer.typedStats(Erasure.scala:1037)
[error] dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:2226)
[error] dotty.tools.dotc.transform.Erasure$Typer.typedClassDef(Erasure.scala:1026)
[error] dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$2(Typer.scala:2581)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2585)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2654)
[error] dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:118)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2720)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2724)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2746)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2796)
[error] dotty.tools.dotc.transform.Erasure$Typer.typedStats(Erasure.scala:1037)
[error] dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:2378)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2626)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2655)
[error] dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:118)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2720)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2724)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2840)
[error] dotty.tools.dotc.transform.Erasure.run(Erasure.scala:124)
[error] dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:303)
[error] scala.collection.immutable.List.map(List.scala:246)
[error] dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:304)
[error] dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:205)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
[error] dotty.tools.dotc.Run.runPhases$5(Run.scala:215)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:223)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:230)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:166)
[error] dotty.tools.dotc.Run.compile(Run.scala:150)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:39)
[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:92)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:186)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:241)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:176)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:157)
[error] sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:157)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:204)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:573)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:573)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:174)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:172)
[error] sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:459)
[error] sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:261)
[error] sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:414)
[error] sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:499)
[error] sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:401)
[error] sbt.internal.inc.Incremental$.apply(Incremental.scala:166)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:573)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:491)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:420)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2177)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2134)
[error] sbt.internal.io.Retry$.apply(Retry.scala:40)
[error] sbt.internal.io.Retry$.apply(Retry.scala:23)
[error] sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:31)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2130)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] sbt.internal.util.$tilde$greater.$anonfun$$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:1128)
[error] java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[error] java.base/java.lang.Thread.run(Thread.java:834)
[error]            
[error] stack trace is suppressed; run last asuivre / Compile / compileIncremental for the full output
[error] (asuivre / Compile / compileIncremental) scala.MatchError: Apply(TypeApply(Ident(convertToEqualizer),List(TypeTree[TypeVar(TypeParamRef(T) -> TypeRef(ThisType(TypeRef(NoPrefix,module class lang)),class Object))])),List(New(TypeTree[TypeRef(TermRef(ThisType(TypeRef(ThisType(TypeRef(NoPrefix,module class asuivre)),module class GraphDBSpec$)),object graph),class Node)]))) (of class dotty.tools.dotc.ast.Trees$Apply)
[error] Total time: 9 s, completed 18 f├®vr. 2021 ├á 23:20:30
liufengyun added a commit to dotty-staging/dotty that referenced this issue Feb 19, 2021
@liufengyun
Fix scala#11466: add test
04d1f12
@liufengyun liufengyun self-assigned this Feb 19, 2021
@liufengyun liufengyun mentioned this issue Feb 19, 2021
Merged
@griggt
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griggt commented Feb 19, 2021

Self-contained minimization (without ScalaTest dependency):

import scala.language.implicitConversions

trait TripleEqualsSupport:
  class Equalizer[L](val leftSide: L)
  def convertToEqualizer[T](left: T): Equalizer[T]

trait TripleEquals extends TripleEqualsSupport:
  implicit override def convertToEqualizer[T](left: T): Equalizer[T] = new Equalizer(left)

class GraphDB[Id]:
  class Node private[GraphDB](val id: Id)

object GraphDBSpec extends TripleEquals:
  object graph extends GraphDB[String]
  import graph.Node
  val m = new Node("Alice")

liufengyun added a commit to dotty-staging/dotty that referenced this issue Feb 19, 2021
@liufengyun
Fix scala#11466: disallow implicit conversion for <init>
e12886e
@liufengyun liufengyun added area:implicits related to implicits itype:bug labels Feb 22, 2021
nicolasstucki added a commit that referenced this issue Feb 24, 2021
@nicolasstucki
Merge pull request #11478 from dotty-staging/fix-i11466
dff96fa 
Fix #11466: disallow implicit conversion for <init>
@jackcviers jackcviers mentioned this issue Sep 8, 2022
Merged
@Kordyjan Kordyjan added this to the 3.0.0 milestone Aug 2, 2023
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Fix #11466: disallow implicit conversion for <init> dotty-staging/dotty
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@liufengyun @Kordyjan @griggt @flomebul