Crash when trying to export the same member twice

[anatoliykmetyuk]

Compiler version

Latest main to date, commit a5a85a28218d1a869680c33cf2dc09e1bf7be829.

Minimized code

object M {
  type B
}

export M.{B, B}

Output (click arrow to expand)

Exception in thread "main" java.lang.AssertionError: assertion failed: duplicate type B#4873; previous was type B#4872                                                                                                                                                                                      
        at scala.runtime.Scala3RunTime$.assertFailed(Scala3RunTime.scala:8)
        at dotty.tools.dotc.core.Scopes$MutableScope.enter(Scopes.scala:271)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.enterNoReplace(SymDenotations.scala:1962)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.enter(SymDenotations.scala:1953)
        at dotty.tools.dotc.core.Symbols$Symbol.entered(Symbols.scala:206)
        at dotty.tools.dotc.typer.Namer.dotty$tools$dotc$typer$Namer$ClassCompleter$$_$process$1$$anonfun$1(Namer.scala:1267)
        at scala.collection.immutable.List.foreach(List.scala:333)
        at dotty.tools.dotc.typer.Namer$ClassCompleter.process$1(Namer.scala:1267)
        at dotty.tools.dotc.typer.Namer$ClassCompleter.processExports(Namer.scala:1278)
        at dotty.tools.dotc.typer.Namer$ClassCompleter.completeInCreationContext(Namer.scala:1463)
        at dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:808)
        at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:167)
        at dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:187)
        at dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:189)
        at dotty.tools.dotc.core.SymDenotations$SymDenotation.ensureCompleted(SymDenotations.scala:369)
        at dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:2602)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2865)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2895)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2960)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2964)
        at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3080)
        at dotty.tools.dotc.typer.TyperPhase.typeCheck$$anonfun$1(TyperPhase.scala:43)
        at dotty.tools.dotc.core.Phases$Phase.monitor(Phases.scala:414)
        at dotty.tools.dotc.typer.TyperPhase.typeCheck(TyperPhase.scala:50)
        at dotty.tools.dotc.typer.TyperPhase.runOn$$anonfun$3(TyperPhase.scala:84)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.immutable.List.foreach(List.scala:333)
        at dotty.tools.dotc.typer.TyperPhase.runOn(TyperPhase.scala:84)
        at dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:225)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1328)
        at dotty.tools.dotc.Run.runPhases$1(Run.scala:236)
        at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:244)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
        at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:68)
        at dotty.tools.dotc.Run.compileUnits(Run.scala:253)
        at dotty.tools.dotc.Run.compileSources(Run.scala:186)
        at dotty.tools.dotc.Run.compile(Run.scala:170)
        at dotty.tools.dotc.Driver.doCompile(Driver.scala:35)
        at dotty.tools.dotc.Driver.process(Driver.scala:195)
        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:205)
        at dotty.tools.dotc.Main.main(Main.scala)