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prolativ opened this issue Jan 8, 2021 · 1 comment
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Compiler crash when defining parameterless PolyFunction #11040

prolativ opened this issue Jan 8, 2021 · 1 comment
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itype:bug itype:crash stat:duplicate

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@prolativ
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prolativ commented Jan 8, 2021

Minimized code

val foo = new PolyFunction { def apply[A]: Unit = ??? }

Output (click arrow to expand)

exception while typing [cannot display due to assertion failed, raw string = TypeDef(rs$line$1$,Template(DefDef(<init>,List(),List(List()),TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Unit)],EmptyTree),List(Apply(Select(New(TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class lang)),class Object)]),<init>),List())),ValDef(_,EmptyTree,EmptyTree),List(DefDef(writeReplace,List(),List(List()),TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),type AnyRef)],Apply(Select(New(TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class runtime)),class ModuleSerializationProxy)]),<init>),List(Literal(Constant(TermRef(ThisType(TypeRef(NoPrefix,module class <empty>)),module rs$line$1)))))), DefDef(foo,List(),List(),TypeTree[RefinedType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),trait PolyFunction),apply,ExprType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Unit)))],Block(List(TypeDef($anon,Template(DefDef(<init>,List(),List(List()),TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Unit)],EmptyTree),List(Apply(Select(New(TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class lang)),class Object)]),<init>),List()), TypeTree[TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),trait PolyFunction)]),ValDef(_,EmptyTree,EmptyTree),List(DefDef(apply,List(),List(),TypeTree[TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Unit)],Ident(???)))))),Typed(Apply(Select(New(TypeTree[TypeRef(NoPrefix,class $anon)]),<init>),List()),TypeTree[RefinedType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),trait PolyFunction),apply,ExprType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Unit)))]))))))] of class class dotty.tools.dotc.ast.Trees$TypeDef # -1
exception while typing [cannot display due to assertion failed, raw string = PackageDef(Ident(<empty>),List(ValDef(rs$line$1,TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class <empty>)),module class rs$line$1$)],Apply(Select(New(TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class <empty>)),module class rs$line$1$)]),<init>),List())), TypeDef(rs$line$1$,Template(DefDef(<init>,List(),List(List()),TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Unit)],EmptyTree),List(Apply(Select(New(TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class lang)),class Object)]),<init>),List())),ValDef(_,EmptyTree,EmptyTree),List(DefDef(writeReplace,List(),List(List()),TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),type AnyRef)],Apply(Select(New(TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class runtime)),class ModuleSerializationProxy)]),<init>),List(Literal(Constant(TermRef(ThisType(TypeRef(NoPrefix,module class <empty>)),module rs$line$1)))))), DefDef(foo,List(),List(),TypeTree[RefinedType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),trait PolyFunction),apply,ExprType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Unit)))],Block(List(TypeDef($anon,Template(DefDef(<init>,List(),List(List()),TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Unit)],EmptyTree),List(Apply(Select(New(TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class lang)),class Object)]),<init>),List()), TypeTree[TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),trait PolyFunction)]),ValDef(_,EmptyTree,EmptyTree),List(DefDef(apply,List(),List(),TypeTree[TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Unit)],Ident(???)))))),Typed(Apply(Select(New(TypeTree[TypeRef(NoPrefix,class $anon)]),<init>),List()),TypeTree[RefinedType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),trait PolyFunction),apply,ExprType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),module scala),class Unit)))]))))))))] of class class dotty.tools.dotc.ast.Trees$PackageDef # -1
Exception in thread "main" java.lang.AssertionError: assertion failed
	at scala.runtime.Scala3RunTime$.assertFailed(Scala3RunTime.scala:11)
	at dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$apply(TypeErasure.scala:464)
	at dotty.tools.dotc.core.TypeErasure.eraseResult(TypeErasure.scala:611)
	at dotty.tools.dotc.core.TypeErasure.eraseInfo(TypeErasure.scala:548)
	at dotty.tools.dotc.core.TypeErasure$.transformInfo(TypeErasure.scala:202)
	at dotty.tools.dotc.transform.Erasure.transform(Erasure.scala:83)
	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:805)
	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:854)
	at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:122)
	at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:116)
	at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:109)
	at dotty.tools.dotc.core.Symbols$.toDenot(Symbols.scala:494)
	at dotty.tools.dotc.transform.Erasure$Typer.dropConstructorProxies$$anonfun$1(Erasure.scala:990)
	at dotty.tools.dotc.transform.Erasure$Typer$$Lambda$975/0x00000000638b3a20.applyVoid(Unknown Source)
	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.immutable.List.foreach(List.scala:333)
	at dotty.tools.dotc.core.Scopes$Scope.foreach(Scopes.scala:94)
	at dotty.tools.dotc.transform.Erasure$Typer.dropConstructorProxies(Erasure.scala:990)
	at dotty.tools.dotc.transform.Erasure$Typer.typedClassDef(Erasure.scala:994)
	at dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$2(Typer.scala:2516)
	at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2520)
	at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2589)
	at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:118)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2659)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2663)
	at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2685)
	at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2735)
	at dotty.tools.dotc.transform.Erasure$Typer.typedStats(Erasure.scala:1004)
	at dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:2313)
	at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2561)
	at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2590)
	at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:118)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2659)
	at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2663)
	at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2779)
	at dotty.tools.dotc.transform.Erasure.run(Erasure.scala:124)
	at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:296)
	at dotty.tools.dotc.core.Phases$Phase$$Lambda$677/000000000000000000.apply(Unknown Source)
	at scala.collection.immutable.List.map(List.scala:246)
	at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:297)
	at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:185)
	at dotty.tools.dotc.Run$$Lambda$357/000000000000000000.applyVoid(Unknown Source)
	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
	at dotty.tools.dotc.Run.runPhases$5(Run.scala:195)
	at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:203)
	at dotty.tools.dotc.Run$$Lambda$317/000000000000000000.apply$mcV$sp(Unknown Source)
	at scala.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
	at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
	at dotty.tools.dotc.Run.compileUnits(Run.scala:210)
	at dotty.tools.dotc.Run.compileUnits(Run.scala:152)
	at dotty.tools.repl.ReplCompiler.runCompilationUnit(ReplCompiler.scala:151)
	at dotty.tools.repl.ReplCompiler.compile(ReplCompiler.scala:161)
	at dotty.tools.repl.ReplDriver.compile(ReplDriver.scala:234)
	at dotty.tools.repl.ReplDriver.interpret(ReplDriver.scala:197)
	at dotty.tools.repl.ReplDriver.loop$1(ReplDriver.scala:130)
	at dotty.tools.repl.ReplDriver.runUntilQuit$$anonfun$1(ReplDriver.scala:133)
	at dotty.tools.repl.ReplDriver$$Lambda$271/0x0000000094829020.apply(Unknown Source)
	at dotty.tools.repl.ReplDriver.withRedirectedOutput(ReplDriver.scala:152)
	at dotty.tools.repl.ReplDriver.runUntilQuit(ReplDriver.scala:133)
	at dotty.tools.repl.Main$.main(Main.scala:6)
	at dotty.tools.repl.Main.main(Main.scala)
@bishabosha
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I would close this in favour of #10075 which documents some more examples in this comment #10075 (comment)

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@prolativ @bishabosha