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def == with an implicit crashes the compiler #6816

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def == with an implicit crashes the compiler#6816
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itype:bug
@soronpo

Description

@soronpo
soronpo
opened on Jul 6, 2019

minimized code

trait Bar
class MyBool
trait Foo {
  def == (that : Foo)(implicit b : Bar) : Boolean = ???
}

case class FooCC(f : Foo) //Compiler crash

FWIW, the following code compiles fine in dotty, but gets a missing implicit error in scalac:

trait Bar
class MyBool
trait Foo {
  def == (that : Foo)(implicit b : Bar) : MyBool = new MyBool
}

case class FooCC(f : Foo) //implicit not found in scalac

Related scalac issue: scala/bug#10536
Related dotty issue if extension methods will replace == in Any: https://github.com/lampepfl/dotty/issues/5803

Stack trace 
error while transforming (f: Foo) extends Object(), _root_.scala.Product, _root_.scala.Serializable { 
  val f: Foo
  def productElementName(x$1: _root_.scala.Int): java.lang.String = 
    x$1 match 
      {
        case 0 => "f"
        case _ => 
          throw 
            new java.lang.IndexOutOfBoundsException(
              java.lang.String.valueOf(x$1)
            )
      }
  def copy(f: Foo): FooCC = new FooCC(f)
  def copy$default$1: Foo = FooCC.this.f:Foo(FooCC.this.f) @uncheckedVariance
  def _1: Foo = this.f
}
error while transforming @scala.annotation.internal.SourceFile(
  "C:\\IdeaProjects\\dottytest\\src\\main\\scala\\Main.scala"
) case class FooCC(f: Foo) extends Object(), _root_.scala.Product, _root_.scala.
  Serializable
 { 
  val f: Foo
  def productElementName(x$1: _root_.scala.Int): java.lang.String = 
    x$1 match 
      {
        case 0 => "f"
        case _ => 
          throw 
            new java.lang.IndexOutOfBoundsException(
              java.lang.String.valueOf(x$1)
            )
      }
  def copy(f: Foo): FooCC = new FooCC(f)
  def copy$default$1: Foo = FooCC.this.f:Foo(FooCC.this.f) @uncheckedVariance
  def _1: Foo = this.f
}
error while transforming package <empty> {
  @scala.annotation.internal.SourceFile(
    "C:\\IdeaProjects\\dottytest\\src\\main\\scala\\Main.scala"
  ) trait Bar() extends Object {}
  @scala.annotation.internal.SourceFile(
    "C:\\IdeaProjects\\dottytest\\src\\main\\scala\\Main.scala"
  ) trait Foo() extends Object { 
    def ==(that: Foo)(implicit b: Bar): Boolean = ???
  }
  @scala.annotation.internal.SourceFile(
    "C:\\IdeaProjects\\dottytest\\src\\main\\scala\\Main.scala"
  ) case class FooCC(f: Foo) extends Object(), _root_.scala.Product, _root_.
    scala
  .Serializable { 
    val f: Foo
    def productElementName(x$1: _root_.scala.Int): java.lang.String = 
      x$1 match 
        {
          case 0 => "f"
          case _ => 
            throw 
              new java.lang.IndexOutOfBoundsException(
                java.lang.String.valueOf(x$1)
              )
        }
    def copy(f: Foo): FooCC = new FooCC(f)
    def copy$default$1: Foo = FooCC.this.f:Foo(FooCC.this.f) @uncheckedVariance
    def _1: Foo = this.f
  }
  final lazy module val FooCC: FooCC$ = new FooCC$()
  final module class FooCC$() extends Object(), Function1[Foo, FooCC], _root_.
    scala
  .Serializable { this: FooCC.type => 
    def apply(f: Foo): FooCC = new FooCC(f)
    def unapply(x$1: FooCC): FooCC = x$1
  }
  final lazy module val Main: Main$ = new Main$()
  final module class Main$() extends Object(), _root_.scala.Serializable { 
    this: Main.type =>
   
    def main(args: Array[String]): Unit = 
      {
        println("Hello world!")
        println(Main.msg)
      }
    def msg: String = "I was compiled by dotty :)"
  }
}
java.lang.AssertionError: assertion failed: ImplicitMethodType(List(b), List(TypeRef(ThisType(TypeRef(NoPrefix,module class <empty>)),class Bar)), TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Boolean)) ConstantType(Constant(false)) while compiling C:\IdeaProjects\dottytest\src\main\scala\Main.scala
[info] exception occurred while compiling C:\IdeaProjects\dottytest\src\main\scala\Main.scala
[error] ## Exception when compiling 1 sources to C:\IdeaProjects\dottytest\target\scala-0.16\classes
[error] assertion failed: ImplicitMethodType(List(b), List(TypeRef(ThisType(TypeRef(NoPrefix,module class <empty>)),class Bar)), TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Boolean)) ConstantType(Constant(false))
[error] dotty.DottyPredef$.assertFail(DottyPredef.scala:16)
[error] dotty.tools.dotc.core.Types$OrType.<init>(Types.scala:2799)
[error] dotty.tools.dotc.core.Types$CachedOrType.<init>(Types.scala:2853)
[error] dotty.tools.dotc.core.Types$OrType$.apply(Types.scala:2858)
[error] dotty.tools.dotc.core.TypeComparer.orType$$anonfun$1(TypeComparer.scala:1933)
[error] dotty.tools.dotc.core.TypeComparer.liftIfHK(TypeComparer.scala:1947)
[error] dotty.tools.dotc.core.TypeComparer.orType(TypeComparer.scala:1933)
[error] dotty.tools.dotc.core.TypeComparer.lub(TypeComparer.scala:1753)
[error] dotty.tools.dotc.core.TypeComparer.lub$$anonfun$1(TypeComparer.scala:1758)
[error] scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126)
[error] scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122)
[error] scala.collection.immutable.List.foldLeft(List.scala:89)
[error] scala.collection.TraversableOnce.$div$colon(TraversableOnce.scala:154)
[error] scala.collection.TraversableOnce.$div$colon$(TraversableOnce.scala:154)
[error] scala.collection.AbstractTraversable.$div$colon(Traversable.scala:108)
[error] dotty.tools.dotc.core.TypeComparer.lub(TypeComparer.scala:1758)
[error] dotty.tools.dotc.typer.TypeAssigner.assignType(TypeAssigner.scala:521)
[error] dotty.tools.dotc.typer.Typer.assignType(Typer.scala:87)
[error] dotty.tools.dotc.ast.tpd$.Match(tpd.scala:129)
[error] dotty.tools.dotc.transform.SyntheticMembers.equalsBody$1(SyntheticMembers.scala:207)
[error] dotty.tools.dotc.transform.SyntheticMembers.syntheticRHS$1(SyntheticMembers.scala:124)
[error] dotty.tools.dotc.transform.SyntheticMembers.syntheticDef$3$$anonfun$2$$anonfun$1(SyntheticMembers.scala:132)
[error] dotty.tools.dotc.transform.SyntheticMembers.synthesizeDef$$anonfun$1(SyntheticMembers.scala:82)
[error] dotty.tools.dotc.ast.tpd$.polyDefDef(tpd.scala:262)
[error] dotty.tools.dotc.ast.tpd$.DefDef(tpd.scala:221)
[error] dotty.tools.dotc.transform.SyntheticMembers.synthesizeDef(SyntheticMembers.scala:82)
[error] dotty.tools.dotc.transform.SyntheticMembers.syntheticDef$1(SyntheticMembers.scala:132)
[error] dotty.tools.dotc.transform.SyntheticMembers.syntheticDefIfMissing$1(SyntheticMembers.scala:105)
[error] dotty.tools.dotc.transform.SyntheticMembers.caseAndValueMethods$$anonfun$1(SyntheticMembers.scala:295)
[error] scala.collection.immutable.List.flatMap(List.scala:338)
[error] dotty.tools.dotc.transform.SyntheticMembers.caseAndValueMethods(SyntheticMembers.scala:295)
[error] dotty.tools.dotc.transform.SyntheticMembers.addSyntheticMembers(SyntheticMembers.scala:471)
[error] dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform$$anonfun$3(PostTyper.scala:236)
[error] dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.withNoCheckNews(PostTyper.scala:96)
[error] dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:237)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1343)
[error] dotty.tools.dotc.transform.MacroTransform$Transformer.transform(MacroTransform.scala:54)
[error] dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:253)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform$$anonfun$2(Trees.scala:1363)
[error] scala.collection.immutable.List.mapConserve(List.scala:179)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1363)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transformStats(Trees.scala:1361)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1349)
[error] dotty.tools.dotc.transform.MacroTransform$Transformer.transform(MacroTransform.scala:54)
[error] dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:312)
[error] dotty.tools.dotc.transform.MacroTransform.run(MacroTransform.scala:21)
[error] dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:316)
[error] scala.collection.immutable.List.map(List.scala:286)
[error] dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:318)
[error] dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:158)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.IndexedSeqOptimized.foreach(IndexedSeqOptimized.scala:36)
[error] scala.collection.IndexedSeqOptimized.foreach$(IndexedSeqOptimized.scala:33)
[error] scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:198)
[error] dotty.tools.dotc.Run.runPhases$5(Run.scala:170)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:178)
[error] dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:102)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:185)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:120)
[error] dotty.tools.dotc.Run.compile(Run.scala:104)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:34)
[error] dotty.tools.dotc.Driver.process(Driver.scala:172)
[error] dotty.tools.dotc.Main.process(Main.scala)
[error] xsbt.CachedCompilerImpl.run(CachedCompilerImpl.java:69)
[error] xsbt.CompilerInterface.run(CompilerInterface.java:41)
[error] sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[error] sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[error] java.lang.reflect.Method.invoke(Unknown Source)
[error] sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:237)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:111)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:90)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:133)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:73)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:116)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:307)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:307)
[error] sbt.internal.inc.Incremental$.doCompile(Incremental.scala:106)
[error] sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:87)
[error] sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:63)
[error] sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:89)
[error] sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:134)
[error] sbt.internal.inc.Incremental$.compile(Incremental.scala:80)
[error] sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:67)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:311)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:269)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:159)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:238)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:69)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1549)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1523)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:40)
[error] sbt.std.Transform$$anon$4.work(System.scala:67)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:269)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error] sbt.Execute.work(Execute.scala:278)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:269)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] java.util.concurrent.FutureTask.run(Unknown Source)
[error] java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
[error] java.util.concurrent.FutureTask.run(Unknown Source)
[error] java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[error] java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[error] java.lang.Thread.run(Unknown Source)
[error]            
[error] java.lang.AssertionError: assertion failed: ImplicitMethodType(List(b), List(TypeRef(ThisType(TypeRef(NoPrefix,module class <empty>)),class Bar)), TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Boolean)) ConstantType(Constant(false))
[error] 	at dotty.DottyPredef$.assertFail(DottyPredef.scala:16)
[error] 	at dotty.tools.dotc.core.Types$OrType.<init>(Types.scala:2799)
[error] 	at dotty.tools.dotc.core.Types$CachedOrType.<init>(Types.scala:2853)
[error] 	at dotty.tools.dotc.core.Types$OrType$.apply(Types.scala:2858)
[error] 	at dotty.tools.dotc.core.TypeComparer.orType$$anonfun$1(TypeComparer.scala:1933)
[error] 	at dotty.tools.dotc.core.TypeComparer.liftIfHK(TypeComparer.scala:1947)
[error] 	at dotty.tools.dotc.core.TypeComparer.orType(TypeComparer.scala:1933)
[error] 	at dotty.tools.dotc.core.TypeComparer.lub(TypeComparer.scala:1753)
[error] 	at dotty.tools.dotc.core.TypeComparer.lub$$anonfun$1(TypeComparer.scala:1758)
[error] 	at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126)
[error] 	at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122)
[error] 	at scala.collection.immutable.List.foldLeft(List.scala:89)
[error] 	at scala.collection.TraversableOnce.$div$colon(TraversableOnce.scala:154)
[error] 	at scala.collection.TraversableOnce.$div$colon$(TraversableOnce.scala:154)
[error] 	at scala.collection.AbstractTraversable.$div$colon(Traversable.scala:108)
[error] 	at dotty.tools.dotc.core.TypeComparer.lub(TypeComparer.scala:1758)
[error] 	at dotty.tools.dotc.typer.TypeAssigner.assignType(TypeAssigner.scala:521)
[error] 	at dotty.tools.dotc.typer.Typer.assignType(Typer.scala:87)
[error] 	at dotty.tools.dotc.ast.tpd$.Match(tpd.scala:129)
[error] 	at dotty.tools.dotc.transform.SyntheticMembers.equalsBody$1(SyntheticMembers.scala:207)
[error] 	at dotty.tools.dotc.transform.SyntheticMembers.syntheticRHS$1(SyntheticMembers.scala:124)
[error] 	at dotty.tools.dotc.transform.SyntheticMembers.syntheticDef$3$$anonfun$2$$anonfun$1(SyntheticMembers.scala:132)
[error] 	at dotty.tools.dotc.transform.SyntheticMembers.synthesizeDef$$anonfun$1(SyntheticMembers.scala:82)
[error] 	at dotty.tools.dotc.ast.tpd$.polyDefDef(tpd.scala:262)
[error] 	at dotty.tools.dotc.ast.tpd$.DefDef(tpd.scala:221)
[error] 	at dotty.tools.dotc.transform.SyntheticMembers.synthesizeDef(SyntheticMembers.scala:82)
[error] 	at dotty.tools.dotc.transform.SyntheticMembers.syntheticDef$1(SyntheticMembers.scala:132)
[error] 	at dotty.tools.dotc.transform.SyntheticMembers.syntheticDefIfMissing$1(SyntheticMembers.scala:105)
[error] 	at dotty.tools.dotc.transform.SyntheticMembers.caseAndValueMethods$$anonfun$1(SyntheticMembers.scala:295)
[error] 	at scala.collection.immutable.List.flatMap(List.scala:338)
[error] 	at dotty.tools.dotc.transform.SyntheticMembers.caseAndValueMethods(SyntheticMembers.scala:295)
[error] 	at dotty.tools.dotc.transform.SyntheticMembers.addSyntheticMembers(SyntheticMembers.scala:471)
[error] 	at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform$$anonfun$3(PostTyper.scala:236)
[error] 	at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.withNoCheckNews(PostTyper.scala:96)
[error] 	at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:237)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1343)
[error] 	at dotty.tools.dotc.transform.MacroTransform$Transformer.transform(MacroTransform.scala:54)
[error] 	at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:253)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform$$anonfun$2(Trees.scala:1363)
[error] 	at scala.collection.immutable.List.mapConserve(List.scala:179)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1363)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transformStats(Trees.scala:1361)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1349)
[error] 	at dotty.tools.dotc.transform.MacroTransform$Transformer.transform(MacroTransform.scala:54)
[error] 	at dotty.tools.dotc.transform.PostTyper$PostTyperTransformer.transform(PostTyper.scala:312)
[error] 	at dotty.tools.dotc.transform.MacroTransform.run(MacroTransform.scala:21)
[error] 	at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:316)
[error] 	at scala.collection.immutable.List.map(List.scala:286)
[error] 	at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:318)
[error] 	at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:158)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] 	at scala.collection.IndexedSeqOptimized.foreach(IndexedSeqOptimized.scala:36)
[error] 	at scala.collection.IndexedSeqOptimized.foreach$(IndexedSeqOptimized.scala:33)
[error] 	at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:198)
[error] 	at dotty.tools.dotc.Run.runPhases$5(Run.scala:170)
[error] 	at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:178)
[error] 	at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] 	at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:102)
[error] 	at dotty.tools.dotc.Run.compileUnits(Run.scala:185)
[error] 	at dotty.tools.dotc.Run.compileSources(Run.scala:120)
[error] 	at dotty.tools.dotc.Run.compile(Run.scala:104)
[error] 	at dotty.tools.dotc.Driver.doCompile(Driver.scala:34)
[error] 	at dotty.tools.dotc.Driver.process(Driver.scala:172)
[error] 	at dotty.tools.dotc.Main.process(Main.scala)
[error] 	at xsbt.CachedCompilerImpl.run(CachedCompilerImpl.java:69)
[error] 	at xsbt.CompilerInterface.run(CompilerInterface.java:41)
[error] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] 	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[error] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[error] 	at java.lang.reflect.Method.invoke(Unknown Source)
[error] 	at sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:237)
[error] 	at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:111)
[error] 	at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:90)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
[error] 	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:133)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:73)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:116)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:307)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:307)
[error] 	at sbt.internal.inc.Incremental$.doCompile(Incremental.scala:106)
[error] 	at sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:87)
[error] 	at sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:116)
[error] 	at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:63)
[error] 	at sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:89)
[error] 	at sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:134)
[error] 	at sbt.internal.inc.Incremental$.compile(Incremental.scala:80)
[error] 	at sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:67)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:311)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:269)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:159)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:238)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:69)
[error] 	at sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1549)
[error] 	at sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1523)
[error] 	at scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error] 	at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:40)
[error] 	at sbt.std.Transform$$anon$4.work(System.scala:67)
[error] 	at sbt.Execute.$anonfun$submit$2(Execute.scala:269)
[error] 	at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error] 	at sbt.Execute.work(Execute.scala:278)
[error] 	at sbt.Execute.$anonfun$submit$1(Execute.scala:269)
[error] 	at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] 	at sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] 	at java.util.concurrent.FutureTask.run(Unknown Source)
[error] 	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
[error] 	at java.util.concurrent.FutureTask.run(Unknown Source)
[error] 	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[error] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[error] 	at java.lang.Thread.run(Unknown Source)
[error] (Compile / compileIncremental) java.lang.AssertionError: assertion failed: ImplicitMethodType(List(b), List(TypeRef(ThisType(TypeRef(NoPrefix,module class <empty>)),class Bar)), TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Boolean)) ConstantType(Constant(false))
[error] Total time: 3 s, completed 00:05:52 07/07/2019

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