Loading coursier-interfaces crashes the compiler

[dos65]

3.4.1

Minimized code

//> using scala 3
//> using dep "io.get-coursier:interface:1.0.19"
import coursierapi.shaded.coursier.internal.api.ApiHelper //<- this import leads to the issue

val foo = "asd"

Output (click arrow to expand)

``` exception caught when loading module class package$: java.lang.AssertionError: assertion failed: duplicate module class Dependency$#4218; previous was class Dependency$#4204 assertion failure for coursierapi.shaded.coursier.type <:< ?{ internal: ? }, frozen = false java.lang.AssertionError: assertion failed: duplicate module class Dependency$#4218; previous was class Dependency$#4204 while typechecking /home/v.chelyshov/projects/oss/samples/scalabug-cs/bug.scala exception occurred while typechecking /home/v.chelyshov/projects/oss/samples/scalabug-cs/bug.scala exception occurred while compiling /home/v.chelyshov/projects/oss/samples/scalabug-cs/bug.scala java.lang.AssertionError: assertion failed: duplicate module class Dependency$#4218; previous was class Dependency$#4204 while compiling /home/v.chelyshov/projects/oss/samples/scalabug-cs/bug.scala Exception in thread "main" java.lang.AssertionError: assertion failed: duplicate module class Dependency$#4218; previous was class Dependency$#4204 at scala.runtime.Scala3RunTime$.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:2035) at dotty.tools.dotc.core.SymDenotations$ClassDenotation.enter(SymDenotations.scala:2026) at dotty.tools.dotc.core.Symbols$Symbol.entered(Symbols.scala:207) at dotty.tools.dotc.core.NamerOps$.addConstructorProxies$$anonfun$1(NamerOps.scala:170) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10) at scala.collection.immutable.List.foreach(List.scala:333) at dotty.tools.dotc.core.Scopes$Scope.foreach(Scopes.scala:93) at dotty.tools.dotc.core.NamerOps$.addConstructorProxies(NamerOps.scala:176) at dotty.tools.dotc.core.classfile.ClassfileParser.parseClass(ClassfileParser.scala:221) at dotty.tools.dotc.core.classfile.ClassfileParser.$anonfun$1(ClassfileParser.scala:87) at dotty.tools.dotc.core.classfile.ClassfileParser.run(ClassfileParser.scala:82) at dotty.tools.dotc.core.ClassfileLoader.load(SymbolLoaders.scala:412) at dotty.tools.dotc.core.ClassfileLoader.doComplete(SymbolLoaders.scala:407) at dotty.tools.dotc.core.SymbolLoader$$anon$1.doComplete(SymbolLoaders.scala:325) at dotty.tools.dotc.core.SymbolLoader.complete(SymbolLoaders.scala:341) at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:174) 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$ClassDenotation.computeMembersNamed(SymDenotations.scala:2113) at dotty.tools.dotc.core.SymDenotations$ClassDenotation.membersNamed(SymDenotations.scala:2083) at dotty.tools.dotc.core.SymDenotations$ClassDenotation.membersNamedNoShadowingBasedOnFlags(SymDenotations.scala:2106) at dotty.tools.dotc.core.SymDenotations$ClassDenotation.nonPrivateMembersNamed(SymDenotations.scala:2096) at dotty.tools.dotc.core.SymDenotations$PackageClassDenotation.recur$5(SymDenotations.scala:2466) at dotty.tools.dotc.core.SymDenotations$PackageClassDenotation.computeMembersNamed(SymDenotations.scala:2533) at dotty.tools.dotc.core.SymDenotations$ClassDenotation.membersNamed(SymDenotations.scala:2083) at dotty.tools.dotc.core.SymDenotations$ClassDenotation.findMember(SymDenotations.scala:2134) at dotty.tools.dotc.core.Types$Type.go$1(Types.scala:689) at dotty.tools.dotc.core.Types$Type.findMember(Types.scala:872) at dotty.tools.dotc.core.Types$Type.memberBasedOnFlags(Types.scala:672) at dotty.tools.dotc.core.Types$Type.member(Types.scala:656) at dotty.tools.dotc.typer.ProtoTypes$SelectionProto.liftedTree1$1(ProtoTypes.scala:204) at dotty.tools.dotc.typer.ProtoTypes$SelectionProto.isMatchedBy(ProtoTypes.scala:226) at dotty.tools.dotc.core.TypeComparer.isMatchedByProto(TypeComparer.scala:2041) at dotty.tools.dotc.core.TypeComparer.firstTry$1(TypeComparer.scala:328) at dotty.tools.dotc.core.TypeComparer.recur(TypeComparer.scala:1455) at dotty.tools.dotc.core.TypeComparer.isSubType(TypeComparer.scala:208) at dotty.tools.dotc.core.TypeComparer.isSubType(TypeComparer.scala:218) at dotty.tools.dotc.core.TypeComparer.topLevelSubType(TypeComparer.scala:128) at dotty.tools.dotc.core.TypeComparer.testSubType(TypeComparer.scala:144) at dotty.tools.dotc.core.TypeComparer$.testSubType(TypeComparer.scala:2938) at dotty.tools.dotc.typer.Typer.adaptNoArgsOther$1(Typer.scala:3828) at dotty.tools.dotc.typer.Typer.adaptNoArgs$1(Typer.scala:3907) at dotty.tools.dotc.typer.Typer.adapt1(Typer.scala:4120) at dotty.tools.dotc.typer.Typer.adapt(Typer.scala:3435) at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3058) at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3062) at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3174) at dotty.tools.dotc.typer.Typer.typeSelectOnTerm$1(Typer.scala:686) at dotty.tools.dotc.typer.Typer.typedSelect(Typer.scala:724) at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2897) at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2990) at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3058) at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3062) at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3174) at dotty.tools.dotc.typer.Typer.typeSelectOnTerm$1(Typer.scala:686) at dotty.tools.dotc.typer.Typer.typedSelect(Typer.scala:724) at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2897) at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2990) at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3058) at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3062) at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3174) at dotty.tools.dotc.typer.Namer.typedAheadExpr$$anonfun$1(Namer.scala:1619) at dotty.tools.dotc.typer.Namer.typedAhead(Namer.scala:1609) at dotty.tools.dotc.typer.Namer.typedAheadExpr(Namer.scala:1619) at dotty.tools.dotc.typer.Namer$Completer.$anonfun$14(Namer.scala:790) at dotty.tools.dotc.typer.Typer.typedImportQualifier(Typer.scala:2664) at dotty.tools.dotc.typer.Namer$Completer.typeSig(Namer.scala:790) at dotty.tools.dotc.typer.Namer$Completer.completeInCreationContext(Namer.scala:922) at dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:810) at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:174) at dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:187) at dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:189) at dotty.tools.dotc.core.SymDenotations$SymDenotation.ensureCompleted(SymDenotations.scala:390) at dotty.tools.dotc.typer.Typer.retrieveSym(Typer.scala:2869) at dotty.tools.dotc.typer.Typer.typedImport(Typer.scala:2667) at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2940) at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2991) at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3058) at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3062) at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3074) at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3130) at dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:2692) at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2961) at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2991) at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3058) at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3062) at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3174) at dotty.tools.dotc.typer.TyperPhase.typeCheck$$anonfun$1(TyperPhase.scala:44) at dotty.tools.dotc.typer.TyperPhase.typeCheck$$anonfun$adapted$1(TyperPhase.scala:54) at scala.Function0.apply$mcV$sp(Function0.scala:42) at dotty.tools.dotc.core.Phases$Phase.monitor(Phases.scala:437) at dotty.tools.dotc.typer.TyperPhase.typeCheck(TyperPhase.scala:54) at dotty.tools.dotc.typer.TyperPhase.runOn$$anonfun$3(TyperPhase.scala:88) 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:88) at dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:247) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10) at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1321) at dotty.tools.dotc.Run.runPhases$1(Run.scala:263) at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:271) at dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:280) at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67) at dotty.tools.dotc.Run.compileUnits(Run.scala:280) at dotty.tools.dotc.Run.compileSources(Run.scala:195) at dotty.tools.dotc.Run.compile(Run.scala:179) 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) Compilation failed ```

[Gedochao]

We'll still need to minimise it to a snippet without the dependency.

[som-snytt]

likely duplicates https://github.com/scala/scala3/issues/20405