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Crash depending on where in a file a certain term is referenced

See original GitHub issue

Compiler version

3.0.0

Minification

Unfortunately this is super hard to minimise in isolation but I can provide a minification and reproduction with scalajs-react.

import japgolly.scalajs.react._

object BUG {

  def problem = Main // crashes

  val NameChanger =
    ScalaComponent.builder[Int]
      .stateless
      .noBackend
      .render_(???)
      .build

  def noProblem = Main // no crash

  val Main =
    ScalaComponent.builder[Unit]
      .initialState(123)
      .render(_ => NameChanger(123))
      .build
}

The only difference between problem which causes a crash, and noProblem which doesn’t, is that problem is defined before NameChanger.

Reproduction

git clone https://github.com/japgolly/scalajs-react.git
cd scalajs-react
git checkout tmp/s3crash
sbt compile

Output (click arrow to expand)

[info] compiling 1 Scala source to scalajs-react/gh-pages/target/scala-3.0.0/classes ...
[info] exception occurred while typechecking scalajs-react/gh-pages/src/main/scala/ghpages/BUG.scala
[info] exception occurred while compiling scalajs-react/gh-pages/src/main/scala/ghpages/BUG.scala
java.lang.AssertionError: cannot merge Constraint(
 uninstantiated variables: S
 constrained types: 
  [X, P, S]
    (using ev: 
      X => japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[P, S]
    ): 
      Conversion[X, 
        japgolly.scalajs.react.component.builder.ComponentBuilder.Step3[P, S, 
          Unit
        ]
      ]
 bounds: 
     X := 
    japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, S]
     P := Unit
     S >: (123 : Int)
 ordering: 
) with Constraint(
 uninstantiated variables: 
 constrained types: 
  [X, P, S]
    (using ev: 
      X => japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[P, S]
    ): 
      Conversion[X, 
        japgolly.scalajs.react.component.builder.ComponentBuilder.Step3[P, S, 
          Unit
        ]
      ]
 bounds: 
     X := 
    japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, Int]
     P := Unit
     S := Int
 ordering: 
), mergeEntries(japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, S], japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, Int]) failed while compiling scalajs-react/gh-pages/src/main/scala/ghpages/BUG.scala
[error] ## Exception when compiling 32 sources to scalajs-react/gh-pages/target/scala-3.0.0/classes
[error] java.lang.AssertionError: cannot merge Constraint(
[error]  uninstantiated variables: S
[error]  constrained types: 
[error]   [X, P, S]
[error]     (using ev: 
[error]       X => japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[P, S]
[error]     ): 
[error]       Conversion[X, 
[error]         japgolly.scalajs.react.component.builder.ComponentBuilder.Step3[P, S, 
[error]           Unit
[error]         ]
[error]       ]
[error]  bounds: 
[error]      X := 
[error]     japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, S]
[error]      P := Unit
[error]      S >: (123 : Int)
[error]  ordering: 
[error] ) with Constraint(
[error]  uninstantiated variables: 
[error]  constrained types: 
[error]   [X, P, S]
[error]     (using ev: 
[error]       X => japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[P, S]
[error]     ): 
[error]       Conversion[X, 
[error]         japgolly.scalajs.react.component.builder.ComponentBuilder.Step3[P, S, 
[error]           Unit
[error]         ]
[error]       ]
[error]  bounds: 
[error]      X := 
[error]     japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, Int]
[error]      P := Unit
[error]      S := Int
[error]  ordering: 
[error] ), mergeEntries(japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, S], japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, Int]) failed
[error] dotty.tools.dotc.core.OrderingConstraint.mergeEntries$1(OrderingConstraint.scala:485)
[error] dotty.tools.dotc.core.OrderingConstraint.$amp$$anonfun$1(OrderingConstraint.scala:508)
[error] dotty.tools.dotc.core.OrderingConstraint.mergeArrays$1$$anonfun$1(OrderingConstraint.scala:460)
[error] scala.runtime.java8.JFunction1$mcVI$sp.apply(JFunction1$mcVI$sp.scala:18)
[error] scala.collection.immutable.Range.foreach(Range.scala:190)
[error] dotty.tools.dotc.core.OrderingConstraint.mergeArrays$2(OrderingConstraint.scala:460)
[error] dotty.tools.dotc.core.OrderingConstraint.merge$2$$anonfun$1(OrderingConstraint.scala:465)
[error] scala.runtime.function.JProcedure2.apply(JProcedure2.java:15)
[error] scala.runtime.function.JProcedure2.apply(JProcedure2.java:10)
[error] dotty.tools.dotc.util.SimpleIdentityMap$Map1.foreachBinding(SimpleIdentityMap.scala:61)
[error] dotty.tools.dotc.core.OrderingConstraint.merge$1(OrderingConstraint.scala:465)
[error] dotty.tools.dotc.core.OrderingConstraint.$amp(OrderingConstraint.scala:508)
[error] dotty.tools.dotc.core.OrderingConstraint.$amp(OrderingConstraint.scala:454)
[error] dotty.tools.dotc.core.TyperState.mergeConstraintWith(TyperState.scala:135)
[error] dotty.tools.dotc.core.TyperState.commit(TyperState.scala:124)
[error] dotty.tools.dotc.typer.Typer.tryEither(Typer.scala:2931)
[error] dotty.tools.dotc.typer.Applications.realApply$1(Applications.scala:983)
[error] dotty.tools.dotc.typer.Applications.typedApply(Applications.scala:1021)
[error] dotty.tools.dotc.typer.Applications.typedApply$(Applications.scala:303)
[error] dotty.tools.dotc.typer.Typer.typedApply(Typer.scala:103)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2669)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2731)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2796)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2800)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2916)
[error] dotty.tools.dotc.typer.Typer.typeSelectOnTerm$1(Typer.scala:602)
[error] dotty.tools.dotc.typer.Typer.typedSelect(Typer.scala:652)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2639)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2730)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2796)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2800)
[error] dotty.tools.dotc.typer.Namer.typedAheadExpr$$anonfun$1(Namer.scala:1377)
[error] dotty.tools.dotc.typer.Namer.typedAhead(Namer.scala:1364)
[error] dotty.tools.dotc.typer.Namer.typedAheadExpr(Namer.scala:1377)
[error] dotty.tools.dotc.typer.Namer.typedAheadRhs$1$$anonfun$1(Namer.scala:1505)
[error] dotty.tools.dotc.typer.PrepareInlineable$.dropInlineIfError(PrepareInlineable.scala:225)
[error] dotty.tools.dotc.typer.Namer.typedAheadRhs$2(Namer.scala:1505)
[error] dotty.tools.dotc.typer.Namer.rhsType$1(Namer.scala:1513)
[error] dotty.tools.dotc.typer.Namer.cookedRhsType$1(Namer.scala:1538)
[error] dotty.tools.dotc.typer.Namer.lhsType$1(Namer.scala:1539)
[error] dotty.tools.dotc.typer.Namer.inferredType$1(Namer.scala:1550)
[error] dotty.tools.dotc.typer.Namer.valOrDefDefSig(Namer.scala:1559)
[error] dotty.tools.dotc.typer.Namer$Completer.typeSig(Namer.scala:699)
[error] dotty.tools.dotc.typer.Namer$Completer.completeInCreationContext(Namer.scala:826)
[error] dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:727)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:167)
[error] dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:188)
[error] dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:190)
[error] dotty.tools.dotc.core.Types$TermRef.underlying(Types.scala:2578)
[error] dotty.tools.dotc.core.Types$Type.widen(Types.scala:1201)
[error] dotty.tools.dotc.typer.Typer.simplify(Typer.scala:2744)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2733)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2796)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2800)
[error] dotty.tools.dotc.typer.Namer.typedAheadExpr$$anonfun$1(Namer.scala:1377)
[error] dotty.tools.dotc.typer.Namer.typedAhead(Namer.scala:1364)
[error] dotty.tools.dotc.typer.Namer.typedAheadExpr(Namer.scala:1377)
[error] dotty.tools.dotc.typer.Namer.typedAheadRhs$1$$anonfun$1(Namer.scala:1505)
[error] dotty.tools.dotc.typer.PrepareInlineable$.dropInlineIfError(PrepareInlineable.scala:225)
[error] dotty.tools.dotc.typer.Namer.typedAheadRhs$2(Namer.scala:1505)
[error] dotty.tools.dotc.typer.Namer.rhsType$1(Namer.scala:1513)
[error] dotty.tools.dotc.typer.Namer.cookedRhsType$1(Namer.scala:1538)
[error] dotty.tools.dotc.typer.Namer.lhsType$1(Namer.scala:1539)
[error] dotty.tools.dotc.typer.Namer.inferredType$1(Namer.scala:1550)
[error] dotty.tools.dotc.typer.Namer.valOrDefDefSig(Namer.scala:1559)
[error] dotty.tools.dotc.typer.Namer.defDefSig(Namer.scala:1642)
[error] dotty.tools.dotc.typer.Namer$Completer.typeSig(Namer.scala:703)
[error] dotty.tools.dotc.typer.Namer$Completer.completeInCreationContext(Namer.scala:826)
[error] dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:727)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:167)
[error] dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:188)
[error] dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:190)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.ensureCompleted(SymDenotations.scala:369)
[error] dotty.tools.dotc.typer.Typer.retrieveSym(Typer.scala:2611)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2636)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2730)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2796)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2800)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2822)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2872)
[error] dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:2328)
[error] dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$2(Typer.scala:2657)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2661)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2730)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2796)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2800)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2822)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2872)
[error] dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:2451)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2702)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2731)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2796)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2800)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2916)
[error] dotty.tools.dotc.typer.FrontEnd.liftedTree1$1(FrontEnd.scala:79)
[error] dotty.tools.dotc.typer.FrontEnd.typeCheck$$anonfun$1(FrontEnd.scala:84)
[error] dotty.tools.dotc.typer.FrontEnd.monitor(FrontEnd.scala:43)
[error] dotty.tools.dotc.typer.FrontEnd.typeCheck(FrontEnd.scala:85)
[error] dotty.tools.dotc.typer.FrontEnd.runOn$$anonfun$3(FrontEnd.scala:120)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.typer.FrontEnd.runOn(FrontEnd.scala:120)
[error] dotty.tools.dotc.Run.runPhases$4$$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$$anonfun$1(Run.scala:223)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:230)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:166)
[error] dotty.tools.dotc.Run.compile(Run.scala:150)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:39)
[error] dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:88)
[error] dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:186)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:241)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:176)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:157)
[error] sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:157)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:204)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:528)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:528)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:174)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:172)
[error] sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:457)
[error] sbt.internal.inc.IncrementalCommon$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$8(Incremental.scala:412)
[error] sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:499)
[error] sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:399)
[error] sbt.internal.inc.Incremental$.apply(Incremental.scala:166)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:528)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:482)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:420)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2362)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2319)
[error] sbt.internal.io.Retry$.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$.compute(BspCompileTask.scala:31)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2315)
[error] scala.Function1.$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 gh-pages / Compile / compileIncremental for the full output
[error] (gh-pages / Compile / compileIncremental) java.lang.AssertionError: cannot merge Constraint(
[error]  uninstantiated variables: S
[error]  constrained types: 
[error]   [X, P, S]
[error]     (using ev: 
[error]       X => japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[P, S]
[error]     ): 
[error]       Conversion[X, 
[error]         japgolly.scalajs.react.component.builder.ComponentBuilder.Step3[P, S, 
[error]           Unit
[error]         ]
[error]       ]
[error]  bounds: 
[error]      X := 
[error]     japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, S]
[error]      P := Unit
[error]      S >: (123 : Int)
[error]  ordering: 
[error] ) with Constraint(
[error]  uninstantiated variables: 
[error]  constrained types: 
[error]   [X, P, S]
[error]     (using ev: 
[error]       X => japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[P, S]
[error]     ): 
[error]       Conversion[X, 
[error]         japgolly.scalajs.react.component.builder.ComponentBuilder.Step3[P, S, 
[error]           Unit
[error]         ]
[error]       ]
[error]  bounds: 
[error]      X := 
[error]     japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, Int]
[error]      P := Unit
[error]      S := Int
[error]  ordering: 
[error] ), mergeEntries(japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, S], japgolly.scalajs.react.component.builder.ComponentBuilder.Step2[Unit, Int]) failed

Workarounds

Any of the following changes avoid the crash:

  1. -  val NameChanger =
+  val NameChanger: ScalaComponent[Int, Unit, Unit, CtorType.Props] =

  2. -  val Main =
+  val Main: ScalaComponent[Unit, Int, Unit, CtorType.Nullary] =

  3. -      .initialState(123)
+      .initialState[Int](123)

  4.        .initialState(123)
+      .noBackend // this is normally an implicit conversion

  5. -      .render(_ => NameChanger(123))
+      .render(_ => NameChanger.ctor(123)) // this is normally an implicit conversion

Issue Analytics

  • State:closed
  • Created 2 years ago
  • Comments:6 (6 by maintainers)

github_iconTop GitHub Comments

1reaction
japgollycommented, Jun 23, 2021

Oh crap I was planning on trying again to minimise this further but it completely slipped my mind. Thanks @smarter, it wouldn’t have been fun at all.

1reaction
smartercommented, Jun 23, 2021

It wasn’t fun to do, but I managed to minimize this to:

class InitState

class ComponentSimple

class Props {
  def apply(props: Any): Any = ???
}

class Foo[C](initState: InitState) {
  def build: ComponentSimple = ???
}

class Bar[E] {
  def render(r: E => Any): Unit = {}
}

trait Conv[A, B] {
  def apply(a: A): B
}

object Test {
  def toComponentCtor[F](c: ComponentSimple): Props = ???

  def defaultToNoBackend[G, H](ev: G => Foo[H]): Conv[Foo[H], Bar[H]] = ???

  def stateless[I]: InitState = ???

  def conforms[A]: A => A = ???

  def problem = Main // crashes

  val NameChanger =
    new Foo[Any](stateless)
      .build

  val Main =
    defaultToNoBackend(conforms).apply(new Foo[Any](stateless))
      .render(_ => toComponentCtor(NameChanger)(13))
}
Read more comments on GitHub >

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`asInstanceOf` causes type mismatch error when used in method argument position

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Document given CanEqual on companion objects