NoDenotation.owner

[sir-wabbit]

Minimized code

// AE-44b62f1449e9e3d9ed6f535c2facdcc6283703a3
object Foo {
  object Foo { }
  Foo { }
}
implicit class Foo(a: Float)
case class Foo()

Output (click arrow to expand)

-- Error: test.scala:1:0 -------------------------------------------------------
1 |object Foo {
  |^
  |Foo is already defined as object Foo in package <empty>
-- Error: test.scala:5:15 ------------------------------------------------------
5 |implicit class Foo(a: Float)
  |^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |Foo is already defined as class Foo in package <empty>
exception occurred while typechecking test.scala
exception occurred while compiling test.scala
java.lang.AssertionError: NoDenotation.owner while compiling test.scala
Exception in thread "main" java.lang.AssertionError: NoDenotation.owner
	at dotty.tools.dotc.core.SymDenotations$NoDenotation$.owner(SymDenotations.scala:2403)
	at dotty.tools.dotc.core.SymDenotations$SymDenotation.termRef(SymDenotations.scala:1460)
	at dotty.tools.dotc.typer.ImplicitRunInfo$collectParts$1$.traverse(Implicits.scala:551)
	at dotty.tools.dotc.core.Types$TypeTraverser.apply(Types.scala:5454)
	at dotty.tools.dotc.core.Types$TypeTraverser.apply(Types.scala:5454)
	at dotty.tools.dotc.typer.ProtoTypes$ViewProto.fold(ProtoTypes.scala:434)
	at dotty.tools.dotc.core.Types$TypeAccumulator.foldOver(Types.scala:5417)
	at dotty.tools.dotc.core.Types$TypeTraverser.traverseChildren(Types.scala:5455)
	at dotty.tools.dotc.typer.ImplicitRunInfo$collectParts$1$.traverse(Implicits.scala:560)
	at dotty.tools.dotc.typer.ImplicitRunInfo$collectParts$1$.apply(Implicits.scala:566)
	at dotty.tools.dotc.typer.ImplicitRunInfo.recur$1(Implicits.scala:634)
	at dotty.tools.dotc.typer.ImplicitRunInfo.computeIScope(Implicits.scala:646)
	at dotty.tools.dotc.typer.ImplicitRunInfo.implicitScope$$anonfun$1(Implicits.scala:714)
	at scala.collection.mutable.AnyRefMap.getOrElse(AnyRefMap.scala:155)
	at dotty.tools.dotc.typer.ImplicitRunInfo.implicitScope(Implicits.scala:719)
	at dotty.tools.dotc.Run.implicitScope(Run.scala:32)
	at dotty.tools.dotc.typer.Implicits$ImplicitSearch.implicitScope(Implicits.scala:1340)
	at dotty.tools.dotc.typer.Implicits$ImplicitSearch.bestImplicit(Implicits.scala:1316)
	at dotty.tools.dotc.typer.Implicits$ImplicitSearch.bestImplicit(Implicits.scala:1325)
	at dotty.tools.dotc.typer.Implicits.op$1(Implicits.scala:979)
	at dotty.tools.dotc.typer.Implicits.inferImplicit(Implicits.scala:1015)
	at dotty.tools.dotc.typer.Typer.inferImplicit(Typer.scala:89)
	at dotty.tools.dotc.typer.Implicits.inferView(Implicits.scala:763)
	at dotty.tools.dotc.typer.Typer.inferView(Typer.scala:89)
	at dotty.tools.dotc.typer.Typer.adaptToSubType$1(Typer.scala:3468)
	at dotty.tools.dotc.typer.Typer.adaptNoArgsOther$4(Typer.scala:3264)
	at dotty.tools.dotc.typer.Typer.adaptNoArgs$1(Typer.scala:3326)
	at dotty.tools.dotc.typer.Typer.adapt1(Typer.scala:3557)
	at dotty.tools.dotc.typer.Typer.op$3(Typer.scala:2881)
	at dotty.tools.dotc.typer.Typer.adapt(Typer.scala:2882)
	at dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2544)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2553)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2556)
	at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2670)
	at dotty.tools.dotc.typer.Typer.typeSelectOnTerm$1(Typer.scala:555)
	at dotty.tools.dotc.typer.Typer.typedSelect(Typer.scala:579)
	at dotty.tools.dotc.typer.Typer.tryApply$1(Typer.scala:2791)
	at dotty.tools.dotc.typer.Typer.tryInsertApplyOrImplicit$$anonfun$2(Typer.scala:2813)
	at dotty.tools.dotc.typer.Typer.tryEither(Typer.scala:2678)
	at dotty.tools.dotc.typer.Typer.tryInsertApplyOrImplicit(Typer.scala:2822)
	at dotty.tools.dotc.typer.Typer.adaptToArgs$1(Typer.scala:3008)
	at dotty.tools.dotc.typer.Typer.adapt1(Typer.scala:3549)
	at dotty.tools.dotc.typer.Typer.op$3(Typer.scala:2881)
	at dotty.tools.dotc.typer.Typer.adapt(Typer.scala:2882)
	at dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2544)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2553)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2556)
	at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2670)
	at dotty.tools.dotc.typer.Applications.typedFunPart$$anonfun$1(Applications.scala:843)
	at dotty.tools.dotc.typer.Typer.tryEither(Typer.scala:2678)
	at dotty.tools.dotc.typer.Applications.typedFunPart(Applications.scala:852)
	at dotty.tools.dotc.typer.Typer.typedFunPart(Typer.scala:89)
	at dotty.tools.dotc.typer.Applications.realApply$1(Applications.scala:864)
	at dotty.tools.dotc.typer.Applications.typedApply(Applications.scala:999)
	at dotty.tools.dotc.typer.Typer.typedApply(Typer.scala:89)
	at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2418)
	at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2478)
	at dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2544)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2553)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2556)
	at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2604)
	at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2626)
	at dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:2076)
	at dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$2(Typer.scala:2406)
	at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2410)
	at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2477)
	at dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2544)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2553)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2556)
	at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2578)
	at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2626)
	at dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:2076)
	at dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$2(Typer.scala:2406)
	at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2410)
	at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2477)
	at dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2544)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2553)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2556)
	at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2578)
	at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2626)
	at dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:2202)
	at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2450)
	at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2478)
	at dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2544)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2553)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2556)
	at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2670)
	at dotty.tools.dotc.typer.FrontEnd.liftedTree1$1(FrontEnd.scala:79)
	at dotty.tools.dotc.typer.FrontEnd.typeCheck$$anonfun$1(FrontEnd.scala:84)
	at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
	at dotty.tools.dotc.typer.FrontEnd.monitor(FrontEnd.scala:42)
	at dotty.tools.dotc.typer.FrontEnd.typeCheck(FrontEnd.scala:85)
	at dotty.tools.dotc.typer.FrontEnd.runOn$$anonfun$3(FrontEnd.scala:114)
	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.immutable.List.foreach(List.scala:333)
	at dotty.tools.dotc.typer.FrontEnd.runOn(FrontEnd.scala:114)
	at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:180)
	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
	at dotty.tools.dotc.Run.runPhases$5(Run.scala:190)
	at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:198)
	at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
	at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:64)
	at dotty.tools.dotc.Run.compileUnits(Run.scala:205)
	at dotty.tools.dotc.Run.compileSources(Run.scala:142)
	at dotty.tools.dotc.Run.compile(Run.scala:124)
	at dotty.tools.dotc.Driver.doCompile(Driver.scala:38)
	at dotty.tools.dotc.Driver.process(Driver.scala:194)
	at dotty.tools.dotc.Driver.process(Driver.scala:163)
	at dotty.tools.dotc.Driver.process(Driver.scala:175)
	at dotty.tools.dotc.Driver.main(Driver.scala:202)
	at dotty.tools.dotc.Main.main(Main.scala)

[sir-wabbit]

And another far more obscure example (I could not minimize it further, ridiculous!):

case class Bar(
} { ;
object Bar {
  class Foo(a: Int) extends AnyVal
  Foo()
}
type Bar

[soronpo]

Here is a very short example that leads to a NoDenotation.owner assertion:

type Id[T] = T match {
  case _ => T
}

class Foo[T <: Id[T]]