Closed
Description
minimized code
def f(): Any = ???
var f: (UndefinedA & UndefinedB) { val x: Int } = ???
val a = fStack trace
-- [E006] Unbound Identifier Error: testing/Test.scala:2:8 ---------------------
2 |var f: (UndefinedA & UndefinedB) { val x: Int } = ???
| ^^^^^^^^^^
| Not found: type UndefinedA
longer explanation available when compiling with `-explain`
-- [E006] Unbound Identifier Error: testing/Test.scala:2:21 --------------------
2 |var f: (UndefinedA & UndefinedB) { val x: Int } = ???
| ^^^^^^^^^^
| Not found: type UndefinedB
longer explanation available when compiling with `-explain`
exception occurred while typechecking testing/Test.scala
exception occurred while compiling testing/Test.scala
scala.MatchError: MethodType(List(), List(), TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Any)) (of class dotty.tools.dotc.core.Types$CachedMethodType) while compiling testing/Test.scala
Exception in thread "main" scala.MatchError: MethodType(List(), List(), TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Any)) (of class dotty.tools.dotc.core.Types$CachedMethodType)
at dotty.tools.dotc.core.TypeComparer.ensureStableSingleton(TypeComparer.scala:1496)
at dotty.tools.dotc.core.TypeComparer.compareRec$1(TypeComparer.scala:556)
at dotty.tools.dotc.core.TypeComparer.thirdTry$1(TypeComparer.scala:559)
at dotty.tools.dotc.core.TypeComparer.secondTry$1(TypeComparer.scala:445)
at dotty.tools.dotc.core.TypeComparer.firstTry$1(TypeComparer.scala:356)
at dotty.tools.dotc.core.TypeComparer.recur(TypeComparer.scala:1077)
at dotty.tools.dotc.core.TypeComparer.isSubType(TypeComparer.scala:161)
at dotty.tools.dotc.core.TypeComparer.isSubType(TypeComparer.scala:171)
at dotty.tools.dotc.core.TypeComparer.isSubType(TypeComparer.scala:171)
at dotty.tools.dotc.core.ConstraintHandling.isSubTypeWhenFrozen(ConstraintHandling.scala:220)
at dotty.tools.dotc.core.TypeComparer.isSubTypeWhenFrozen(TypeComparer.scala:30)
at dotty.tools.dotc.core.Types$Type.frozen_$less$colon$less(Types.scala:898)
at dotty.tools.dotc.core.Types$Type.overrides(Types.scala:939)
at dotty.tools.dotc.core.Denotations$Denotation.prefer$2(Denotations.scala:465)
at dotty.tools.dotc.core.Denotations$Denotation.mergeSingleDenot$1(Denotations.scala:472)
at dotty.tools.dotc.core.Denotations$Denotation.mergeDenot$1(Denotations.scala:404)
at dotty.tools.dotc.core.Denotations$Denotation.$amp(Denotations.scala:507)
at dotty.tools.dotc.core.Denotations$DenotUnion.toDenot(Denotations.scala:1303)
at dotty.tools.dotc.core.SymDenotations$ClassDenotation.findMember(SymDenotations.scala:1851)
at dotty.tools.dotc.typer.NamerContextOps.denotNamed(Namer.scala:62)
at dotty.tools.dotc.core.Contexts$Context.denotNamed(Contexts.scala:75)
at dotty.tools.dotc.typer.Typer.loop$2(Typer.scala:287)
at dotty.tools.dotc.typer.Typer.findRefRecur$1(Typer.scala:345)
at dotty.tools.dotc.typer.Typer.findRef(Typer.scala:348)
at dotty.tools.dotc.typer.Typer.typedIdent(Typer.scala:399)
at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2098)
at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2176)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2213)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2225)
at dotty.tools.dotc.typer.Namer.typedAheadExpr$$anonfun$1(Namer.scala:1263)
at dotty.tools.dotc.typer.Namer.typedAhead(Namer.scala:1253)
at dotty.tools.dotc.typer.Namer.typedAheadExpr(Namer.scala:1263)
at dotty.tools.dotc.typer.Namer.rhsType$2(Namer.scala:1397)
at dotty.tools.dotc.typer.Namer.cookedRhsType$1(Namer.scala:1408)
at dotty.tools.dotc.typer.Namer.lhsType$1(Namer.scala:1409)
at dotty.tools.dotc.typer.Namer.inferredType$1(Namer.scala:1420)
at dotty.tools.dotc.typer.Namer.valOrDefDefSig(Namer.scala:1428)
at dotty.tools.dotc.typer.Namer$Completer.typeSig(Namer.scala:811)
at dotty.tools.dotc.typer.Namer$Completer.completeInCreationContext(Namer.scala:935)
at dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:843)
at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:258)
at dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:185)
at dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:187)
at dotty.tools.dotc.core.SymDenotations$SymDenotation.ensureCompleted(SymDenotations.scala:398)
at dotty.tools.dotc.typer.Typer.retrieveSym(Typer.scala:2071)
at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2096)
at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2176)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2213)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2225)
at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2247)
at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2291)
at dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:1784)
at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2109)
at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2176)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2213)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2225)
at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2247)
at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2291)
at dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:1910)
at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2150)
at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2177)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2213)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2225)
at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2333)
at dotty.tools.dotc.typer.FrontEnd.liftedTree1$2(FrontEnd.scala:78)
at dotty.tools.dotc.typer.FrontEnd.typeCheck$$anonfun$1(FrontEnd.scala:83)
at dotty.runtime.function.JFunction0$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:84)
at dotty.tools.dotc.typer.FrontEnd.runOn$$anonfun$3(FrontEnd.scala:114)
at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
at scala.collection.immutable.List.foreach(List.scala:305)
at dotty.tools.dotc.typer.FrontEnd.runOn(FrontEnd.scala:114)
at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:161)
at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
at dotty.tools.dotc.Run.runPhases$5(Run.scala:171)
at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:179)
at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:65)
at dotty.tools.dotc.Run.compileUnits(Run.scala:186)
at dotty.tools.dotc.Run.compileSources(Run.scala:123)
at dotty.tools.dotc.Run.compile(Run.scala:106)
at dotty.tools.dotc.Driver.doCompile(Driver.scala:36)
at dotty.tools.dotc.Driver.process(Driver.scala:189)
at dotty.tools.dotc.Driver.process(Driver.scala:158)
at dotty.tools.dotc.Driver.process(Driver.scala:170)
at dotty.tools.dotc.Driver.main(Driver.scala:197)
at dotty.tools.dotc.Main.main(Main.scala)