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Fix #9916: Round-trip through sourceModule in scalacLinkedClass #9976

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Fix #9916: Round-trip through sourceModule in scalacLinkedClass #9976

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griggt
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@griggt griggt commented Oct 9, 2020 •
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Commit e88c5b7 introduced the regression documented in #9916.

The commit message states:

The round-trip is useless, and causes issues with some
Scala2-emitted modules that do not have module classes (seems to be
related to modules inside traits).

Do we have some concrete examples / test cases where the round-trip causes issues, to motivate finding a solution other than reverting the commit? [Edit: see comments below for examples]

/cc @sjrd

Fixes #9916 (but breaks the examples below)

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Hello, and thank you for opening this PR! 🎉

All contributors have signed the CLA, thank you! ❤️

Have an awesome day! ☀️

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griggt commented Oct 10, 2020

Here's an example (minimized from fastparse in the community build) where the round-trip causes issues:

import scala.tools.nsc.{Global, Settings}

object ScalacParser{
  val settings = new Settings()
  val global = new Global(settings)
}
Compiler output 
Error while emitting Main.scala
[info] exception occurred while compiling /src/dotty-issues/pull-9976/src/main/scala/Main.scala
dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait Trees from /home/tgrigg/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.13.3/scala-reflect-2.13.3.jar(scala/reflect/internal/Trees.class):
error occurred at position 50979: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$) while compiling /src/dotty-issues/pull-9976/src/main/scala/Main.scala
[error] ## Exception when compiling 1 sources to /src/dotty-issues/pull-9976/target/scala-0.28/classes
[error] dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait Trees from /home/tgrigg/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.13.3/scala-reflect-2.13.3.jar(scala/reflect/internal/Trees.class):
[error] error occurred at position 50979: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$)
[error] dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler.errorBadSignature(Scala2Unpickler.scala:157)
[error] dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler.handleRuntimeException(Scala2Unpickler.scala:164)
[error] dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$LocalUnpickler.complete(Scala2Unpickler.scala:606)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:166)
[error] dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:188)
[error] dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:190)
[error] dotty.tools.dotc.core.DenotTransformers$InfoTransformer.transform(DenotTransformers.scala:42)
[error] dotty.tools.dotc.core.DenotTransformers$InfoTransformer.transform$(DenotTransformers.scala:34)
[error] dotty.tools.dotc.transform.FirstTransform.transform(FirstTransform.scala:36)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] dotty.tools.dotc.core.Symbols$.toDenot(Symbols.scala:487)
[error] dotty.tools.dotc.core.SymDenotations$ClassDenotation.registeredCompanion(SymDenotations.scala:2146)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.companionType(SymDenotations.scala:1168)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.companionClass(SymDenotations.scala:1175)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.linkedClass(SymDenotations.scala:1216)
[error] dotty.tools.dotc.transform.ExtensionMethods.transform(ExtensionMethods.scala:58)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] dotty.tools.dotc.transform.ValueClasses$.isDerivedValueClass(ValueClasses.scala:17)
[error] dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$apply(TypeErasure.scala:447)
[error] dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$eraseResult(TypeErasure.scala:580)
[error] dotty.tools.dotc.core.TypeErasure.eraseInfo(TypeErasure.scala:547)
[error] dotty.tools.dotc.core.TypeErasure$.transformInfo(TypeErasure.scala:202)
[error] dotty.tools.dotc.transform.Erasure.transform(Erasure.scala:82)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] dotty.tools.dotc.core.Symbols$.toDenot(Symbols.scala:487)
[error] dotty.tools.dotc.transform.Mixin.needsTraitSetter(Mixin.scala:167)
[error] dotty.tools.dotc.transform.Mixin.transformSym$$anonfun$1(Mixin.scala:147)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.core.Scopes$Scope.foreach(Scopes.scala:94)
[error] dotty.tools.dotc.transform.Mixin.transformSym(Mixin.scala:150)
[error] dotty.tools.dotc.core.DenotTransformers$SymTransformer.transform(DenotTransformers.scala:70)
[error] dotty.tools.dotc.core.DenotTransformers$SymTransformer.transform$(DenotTransformers.scala:65)
[error] dotty.tools.dotc.transform.Mixin.transform(Mixin.scala:109)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] dotty.tools.dotc.core.Symbols$ClassSymbol.classDenot(Symbols.scala:450)
[error] dotty.tools.dotc.core.Symbols$.toClassDenot(Symbols.scala:490)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.$anonfun$4(BTypesFromSymbols.scala:129)
[error] scala.collection.Iterator$$anon$10.nextCur(Iterator.scala:585)
[error] scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:599)
[error] scala.collection.mutable.Growable.addAll(Growable.scala:61)
[error] scala.collection.mutable.Growable.addAll$(Growable.scala:59)
[error] scala.collection.immutable.SetBuilderImpl.addAll(Set.scala:396)
[error] scala.collection.immutable.Set$.from(Set.scala:353)
[error] scala.collection.IterableOnceOps.toSet(IterableOnce.scala:1265)
[error] scala.collection.IterableOnceOps.toSet$(IterableOnce.scala:1265)
[error] scala.collection.AbstractIterator.toSet(Iterator.scala:1279)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.extension_superInterfaces$1(BTypesFromSymbols.scala:129)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.setClassInfo(BTypesFromSymbols.scala:137)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol$$anonfun$4(BTypesFromSymbols.scala:93)
[error] scala.collection.mutable.HashMap.getOrElse(HashMap.scala:428)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol(BTypesFromSymbols.scala:94)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.setClassInfo(BTypesFromSymbols.scala:120)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol$$anonfun$4(BTypesFromSymbols.scala:93)
[error] scala.collection.mutable.HashMap.getOrElse(HashMap.scala:428)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol(BTypesFromSymbols.scala:94)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.setClassInfo(BTypesFromSymbols.scala:120)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol$$anonfun$4(BTypesFromSymbols.scala:93)
[error] scala.collection.mutable.HashMap.getOrElse(HashMap.scala:428)
[error] dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol(BTypesFromSymbols.scala:94)
[error] dotty.tools.backend.jvm.BCodeHelpers$BCInnerClassGen.getClassBTypeAndRegisterInnerClass(BCodeHelpers.scala:270)
[error] dotty.tools.backend.jvm.BCodeHelpers$BCInnerClassGen.getClassBTypeAndRegisterInnerClass$(BCodeHelpers.scala:210)
[error] dotty.tools.backend.jvm.BCodeHelpers$JCommonBuilder.getClassBTypeAndRegisterInnerClass(BCodeHelpers.scala:649)
[error] dotty.tools.backend.jvm.BCodeHelpers.primitiveOrClassToBType$4$$anonfun$3(BCodeHelpers.scala:800)
[error] scala.collection.immutable.HashMap.getOrElse(HashMap.scala:683)
[error] dotty.tools.backend.jvm.BCodeHelpers.primitiveOrClassToBType$1(BCodeHelpers.scala:800)
[error] dotty.tools.backend.jvm.BCodeHelpers.dotty$tools$backend$jvm$BCodeHelpers$$typeToTypeKind(BCodeHelpers.scala:819)
[error] dotty.tools.backend.jvm.BCodeHelpers$BCInnerClassGen.toTypeKind(BCodeHelpers.scala:299)
[error] dotty.tools.backend.jvm.BCodeHelpers$BCInnerClassGen.toTypeKind$(BCodeHelpers.scala:210)
[error] dotty.tools.backend.jvm.BCodeHelpers$JCommonBuilder.toTypeKind(BCodeHelpers.scala:649)
[error] dotty.tools.backend.jvm.BCodeHelpers$BCForwardersGen.addForwarder(BCodeHelpers.scala:522)
[error] dotty.tools.backend.jvm.BCodeHelpers$BCForwardersGen.addForwarders$$anonfun$2(BCodeHelpers.scala:589)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.backend.jvm.BCodeHelpers$BCForwardersGen.addForwarders(BCodeHelpers.scala:591)
[error] dotty.tools.backend.jvm.BCodeHelpers$BCForwardersGen.addForwarders$(BCodeHelpers.scala:495)
[error] dotty.tools.backend.jvm.BCodeHelpers$JCommonBuilder.addForwarders(BCodeHelpers.scala:649)
[error] dotty.tools.backend.jvm.BCodeHelpers$JMirrorBuilder.genMirrorClass(BCodeHelpers.scala:697)
[error] dotty.tools.backend.jvm.GenBCodePipeline$Worker1.visit(GenBCode.scala:220)
[error] dotty.tools.backend.jvm.GenBCodePipeline$Worker1.run(GenBCode.scala:194)
[error] dotty.tools.backend.jvm.GenBCodePipeline.buildAndSendToDisk(GenBCode.scala:533)
[error] dotty.tools.backend.jvm.GenBCodePipeline.run(GenBCode.scala:499)
[error] dotty.tools.backend.jvm.GenBCode.run(GenBCode.scala:60)
[error] dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:296)
[error] scala.collection.immutable.List.map(List.scala:246)
[error] dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:297)
[error] dotty.tools.backend.jvm.GenBCode.runOn(GenBCode.scala:64)
[error] dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:185)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
[error] dotty.tools.dotc.Run.runPhases$5(Run.scala:195)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:203)
[error] dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:210)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:147)
[error] dotty.tools.dotc.Run.compile(Run.scala:129)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:38)
[error] dotty.tools.dotc.Driver.process(Driver.scala:195)
[error] dotty.tools.dotc.Main.process(Main.scala)
[error] xsbt.CachedCompilerImpl.run(CachedCompilerImpl.java:69)
[error] xsbt.CompilerInterface.run(CompilerInterface.java:41)
[error] java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error] java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] java.base/java.lang.reflect.Method.invoke(Method.java:566)
[error] sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:248)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:122)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:95)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:91)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:186)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3$adapted(MixedAnalyzingCompiler.scala:77)
[error] sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:215)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:77)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:146)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:343)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:343)
[error] sbt.internal.inc.Incremental$.doCompile(Incremental.scala:120)
[error] sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:100)
[error] sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:180)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:98)
[error] sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:102)
[error] sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:155)
[error] sbt.internal.inc.Incremental$.compile(Incremental.scala:92)
[error] sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:75)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:348)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:301)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:168)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:248)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:74)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1765)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1738)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error] sbt.std.Transform$$anon$4.work(Transform.scala:67)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:281)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:19)
[error] sbt.Execute.work(Execute.scala:290)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:281)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[error] java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[error] java.base/java.lang.Thread.run(Thread.java:834)
[error]
[error] dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait Trees from /home/tgrigg/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.13.3/scala-reflect-2.13.3.jar(scala/reflect/internal/Trees.class):
[error] error occurred at position 50979: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$)
[error] 	at dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler.errorBadSignature(Scala2Unpickler.scala:157)
[error] 	at dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler.handleRuntimeException(Scala2Unpickler.scala:164)
[error] 	at dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$LocalUnpickler.complete(Scala2Unpickler.scala:606)
[error] 	at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:166)
[error] 	at dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:188)
[error] 	at dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:190)
[error] 	at dotty.tools.dotc.core.DenotTransformers$InfoTransformer.transform(DenotTransformers.scala:42)
[error] 	at dotty.tools.dotc.core.DenotTransformers$InfoTransformer.transform$(DenotTransformers.scala:34)
[error] 	at dotty.tools.dotc.transform.FirstTransform.transform(FirstTransform.scala:36)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] 	at dotty.tools.dotc.core.Symbols$.toDenot(Symbols.scala:487)
[error] 	at dotty.tools.dotc.core.SymDenotations$ClassDenotation.registeredCompanion(SymDenotations.scala:2146)
[error] 	at dotty.tools.dotc.core.SymDenotations$SymDenotation.companionType(SymDenotations.scala:1168)
[error] 	at dotty.tools.dotc.core.SymDenotations$SymDenotation.companionClass(SymDenotations.scala:1175)
[error] 	at dotty.tools.dotc.core.SymDenotations$SymDenotation.linkedClass(SymDenotations.scala:1216)
[error] 	at dotty.tools.dotc.transform.ExtensionMethods.transform(ExtensionMethods.scala:58)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] 	at dotty.tools.dotc.transform.ValueClasses$.isDerivedValueClass(ValueClasses.scala:17)
[error] 	at dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$apply(TypeErasure.scala:447)
[error] 	at dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$eraseResult(TypeErasure.scala:580)
[error] 	at dotty.tools.dotc.core.TypeErasure.eraseInfo(TypeErasure.scala:547)
[error] 	at dotty.tools.dotc.core.TypeErasure$.transformInfo(TypeErasure.scala:202)
[error] 	at dotty.tools.dotc.transform.Erasure.transform(Erasure.scala:82)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] 	at dotty.tools.dotc.core.Symbols$.toDenot(Symbols.scala:487)
[error] 	at dotty.tools.dotc.transform.Mixin.needsTraitSetter(Mixin.scala:167)
[error] 	at dotty.tools.dotc.transform.Mixin.transformSym$$anonfun$1(Mixin.scala:147)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] 	at scala.collection.immutable.List.foreach(List.scala:333)
[error] 	at dotty.tools.dotc.core.Scopes$Scope.foreach(Scopes.scala:94)
[error] 	at dotty.tools.dotc.transform.Mixin.transformSym(Mixin.scala:150)
[error] 	at dotty.tools.dotc.core.DenotTransformers$SymTransformer.transform(DenotTransformers.scala:70)
[error] 	at dotty.tools.dotc.core.DenotTransformers$SymTransformer.transform$(DenotTransformers.scala:65)
[error] 	at dotty.tools.dotc.transform.Mixin.transform(Mixin.scala:109)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] 	at dotty.tools.dotc.core.Symbols$ClassSymbol.classDenot(Symbols.scala:450)
[error] 	at dotty.tools.dotc.core.Symbols$.toClassDenot(Symbols.scala:490)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.$anonfun$4(BTypesFromSymbols.scala:129)
[error] 	at scala.collection.Iterator$$anon$10.nextCur(Iterator.scala:585)
[error] 	at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:599)
[error] 	at scala.collection.mutable.Growable.addAll(Growable.scala:61)
[error] 	at scala.collection.mutable.Growable.addAll$(Growable.scala:59)
[error] 	at scala.collection.immutable.SetBuilderImpl.addAll(Set.scala:396)
[error] 	at scala.collection.immutable.Set$.from(Set.scala:353)
[error] 	at scala.collection.IterableOnceOps.toSet(IterableOnce.scala:1265)
[error] 	at scala.collection.IterableOnceOps.toSet$(IterableOnce.scala:1265)
[error] 	at scala.collection.AbstractIterator.toSet(Iterator.scala:1279)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.extension_superInterfaces$1(BTypesFromSymbols.scala:129)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.setClassInfo(BTypesFromSymbols.scala:137)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol$$anonfun$4(BTypesFromSymbols.scala:93)
[error] 	at scala.collection.mutable.HashMap.getOrElse(HashMap.scala:428)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol(BTypesFromSymbols.scala:94)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.setClassInfo(BTypesFromSymbols.scala:120)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol$$anonfun$4(BTypesFromSymbols.scala:93)
[error] 	at scala.collection.mutable.HashMap.getOrElse(HashMap.scala:428)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol(BTypesFromSymbols.scala:94)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.setClassInfo(BTypesFromSymbols.scala:120)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol$$anonfun$4(BTypesFromSymbols.scala:93)
[error] 	at scala.collection.mutable.HashMap.getOrElse(HashMap.scala:428)
[error] 	at dotty.tools.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol(BTypesFromSymbols.scala:94)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$BCInnerClassGen.getClassBTypeAndRegisterInnerClass(BCodeHelpers.scala:270)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$BCInnerClassGen.getClassBTypeAndRegisterInnerClass$(BCodeHelpers.scala:210)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$JCommonBuilder.getClassBTypeAndRegisterInnerClass(BCodeHelpers.scala:649)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers.primitiveOrClassToBType$4$$anonfun$3(BCodeHelpers.scala:800)
[error] 	at scala.collection.immutable.HashMap.getOrElse(HashMap.scala:683)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers.primitiveOrClassToBType$1(BCodeHelpers.scala:800)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers.dotty$tools$backend$jvm$BCodeHelpers$$typeToTypeKind(BCodeHelpers.scala:819)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$BCInnerClassGen.toTypeKind(BCodeHelpers.scala:299)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$BCInnerClassGen.toTypeKind$(BCodeHelpers.scala:210)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$JCommonBuilder.toTypeKind(BCodeHelpers.scala:649)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$BCForwardersGen.addForwarder(BCodeHelpers.scala:522)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$BCForwardersGen.addForwarders$$anonfun$2(BCodeHelpers.scala:589)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] 	at scala.collection.immutable.List.foreach(List.scala:333)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$BCForwardersGen.addForwarders(BCodeHelpers.scala:591)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$BCForwardersGen.addForwarders$(BCodeHelpers.scala:495)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$JCommonBuilder.addForwarders(BCodeHelpers.scala:649)
[error] 	at dotty.tools.backend.jvm.BCodeHelpers$JMirrorBuilder.genMirrorClass(BCodeHelpers.scala:697)
[error] 	at dotty.tools.backend.jvm.GenBCodePipeline$Worker1.visit(GenBCode.scala:220)
[error] 	at dotty.tools.backend.jvm.GenBCodePipeline$Worker1.run(GenBCode.scala:194)
[error] 	at dotty.tools.backend.jvm.GenBCodePipeline.buildAndSendToDisk(GenBCode.scala:533)
[error] 	at dotty.tools.backend.jvm.GenBCodePipeline.run(GenBCode.scala:499)
[error] 	at dotty.tools.backend.jvm.GenBCode.run(GenBCode.scala:60)
[error] 	at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:296)
[error] 	at scala.collection.immutable.List.map(List.scala:246)
[error] 	at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:297)
[error] 	at dotty.tools.backend.jvm.GenBCode.runOn(GenBCode.scala:64)
[error] 	at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:185)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] 	at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
[error] 	at dotty.tools.dotc.Run.runPhases$5(Run.scala:195)
[error] 	at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:203)
[error] 	at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] 	at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] 	at dotty.tools.dotc.Run.compileUnits(Run.scala:210)
[error] 	at dotty.tools.dotc.Run.compileSources(Run.scala:147)
[error] 	at dotty.tools.dotc.Run.compile(Run.scala:129)
[error] 	at dotty.tools.dotc.Driver.doCompile(Driver.scala:38)
[error] 	at dotty.tools.dotc.Driver.process(Driver.scala:195)
[error] 	at dotty.tools.dotc.Main.process(Main.scala)
[error] 	at xsbt.CachedCompilerImpl.run(CachedCompilerImpl.java:69)
[error] 	at xsbt.CompilerInterface.run(CompilerInterface.java:41)
[error] 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error] 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] 	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[error] 	at sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:248)
[error] 	at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:122)
[error] 	at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:95)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:91)
[error] 	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:186)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3$adapted(MixedAnalyzingCompiler.scala:77)
[error] 	at sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:215)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:77)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:146)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:343)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:343)
[error] 	at sbt.internal.inc.Incremental$.doCompile(Incremental.scala:120)
[error] 	at sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:100)
[error] 	at sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:180)
[error] 	at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:98)
[error] 	at sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:102)
[error] 	at sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:155)
[error] 	at sbt.internal.inc.Incremental$.compile(Incremental.scala:92)
[error] 	at sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:75)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:348)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:301)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:168)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:248)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:74)
[error] 	at sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1765)
[error] 	at sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1738)
[error] 	at scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] 	at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error] 	at sbt.std.Transform$$anon$4.work(Transform.scala:67)
[error] 	at sbt.Execute.$anonfun$submit$2(Execute.scala:281)
[error] 	at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:19)
[error] 	at sbt.Execute.work(Execute.scala:290)
[error] 	at sbt.Execute.$anonfun$submit$1(Execute.scala:281)
[error] 	at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] 	at sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] 	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[error] 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[error] 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[error] 	at java.base/java.lang.Thread.run(Thread.java:834)
[error] (Compile / compileIncremental) dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait Trees from /home/tgrigg/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.13.3/scala-reflect-2.13.3.jar(scala/reflect/internal/Trees.class):
[error] error occurred at position 50979: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$)

@griggt
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griggt commented Oct 10, 2020

... and a standalone reproducer where the round-trip causes issues (works on current master, fails if this PR is applied)

//src/dotty-issues/p9776/lib$ cat build.sbt
scalaVersion := "2.13.3"
name := "p9976-lib"
organization := "io.grigg"
version := "1.0"

//src/dotty-issues/p9776/lib$ cat src/main/scala/Lib.scala
package p9976

trait T {
  class A
  object A
  def A(x: Int): Unit = ???
}

//src/dotty-issues/p9776/lib$ sbt publishLocal
//src/dotty-issues/p9776/test$ cat build.sbt
scalaVersion := "0.28.0-bin-SNAPSHOT"
name := "p9976-test"
version := "0.1"
libraryDependencies += ("io.grigg" %% "p9976-lib" % "1.0").withDottyCompat(scalaVersion.value)

//src/dotty-issues/p9776/test$ cat src/main/scala/Test.scala
import p9976.T

trait Test {
  def foo: T
}

//src/dotty-issues/p9776/test$ sbt compile
Compiler output 
[info] Compiling 1 Scala source to /src/dotty-issues/p9776/test/target/scala-0.28/classes ...
dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait T from /home/tgrigg/.ivy2/local/io.grigg/p9976-lib_2.13/1.0/jars/p9976-lib_2.13.jar(p9976/T.class):
error occurred at position 199: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$) while traversing p9976.T
dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait T from /home/tgrigg/.ivy2/local/io.grigg/p9976-lib_2.13/1.0/jars/p9976-lib_2.13.jar(p9976/T.class):
error occurred at position 199: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$) while traversing def foo(): p9976.T
dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait T from /home/tgrigg/.ivy2/local/io.grigg/p9976-lib_2.13/1.0/jars/p9976-lib_2.13.jar(p9976/T.class):
error occurred at position 199: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$) while traversing () extends Object {
  def foo(): p9976.T
}
dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait T from /home/tgrigg/.ivy2/local/io.grigg/p9976-lib_2.13/1.0/jars/p9976-lib_2.13.jar(p9976/T.class):
error occurred at position 199: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$) while traversing @scala.annotation.internal.SourceFile(
  "/src/dotty-issues/p9776/test/src/main/scala/Test.scala"
) trait Test() extends Object {
  def foo(): p9976.T
}
dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait T from /home/tgrigg/.ivy2/local/io.grigg/p9976-lib_2.13/1.0/jars/p9976-lib_2.13.jar(p9976/T.class):
error occurred at position 199: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$) while traversing package <empty> {
  @scala.annotation.internal.SourceFile(
    "/src/dotty-issues/p9776/test/src/main/scala/Test.scala"
  ) trait Test() extends Object {
    def foo(): p9976.T
  }
}
[info] exception occurred while compiling /src/dotty-issues/p9776/test/src/main/scala/Test.scala
dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait T from /home/tgrigg/.ivy2/local/io.grigg/p9976-lib_2.13/1.0/jars/p9976-lib_2.13.jar(p9976/T.class):
error occurred at position 199: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$) while compiling /src/dotty-issues/p9776/test/src/main/scala/Test.scala
[error] ## Exception when compiling 1 sources to /src/dotty-issues/p9776/test/target/scala-0.28/classes
[error] dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait T from /home/tgrigg/.ivy2/local/io.grigg/p9976-lib_2.13/1.0/jars/p9976-lib_2.13.jar(p9976/T.class):
[error] error occurred at position 199: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$)
[error] dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler.errorBadSignature(Scala2Unpickler.scala:157)
[error] dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler.handleRuntimeException(Scala2Unpickler.scala:164)
[error] dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$LocalUnpickler.complete(Scala2Unpickler.scala:606)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:166)
[error] dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:188)
[error] dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:190)
[error] dotty.tools.dotc.core.DenotTransformers$InfoTransformer.transform(DenotTransformers.scala:42)
[error] dotty.tools.dotc.core.DenotTransformers$InfoTransformer.transform$(DenotTransformers.scala:34)
[error] dotty.tools.dotc.transform.FirstTransform.transform(FirstTransform.scala:36)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] dotty.tools.dotc.core.Symbols$.toDenot(Symbols.scala:487)
[error] dotty.tools.dotc.core.SymDenotations$ClassDenotation.registeredCompanion(SymDenotations.scala:2146)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.companionType(SymDenotations.scala:1168)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.companionClass(SymDenotations.scala:1175)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.linkedClass(SymDenotations.scala:1216)
[error] dotty.tools.dotc.transform.ExtensionMethods.transform(ExtensionMethods.scala:58)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] dotty.tools.dotc.transform.ValueClasses$.isDerivedValueClass(ValueClasses.scala:17)
[error] dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$apply(TypeErasure.scala:447)
[error] dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$eraseResult(TypeErasure.scala:580)
[error] dotty.tools.dotc.core.TypeErasure.eraseInfo(TypeErasure.scala:547)
[error] dotty.tools.dotc.core.TypeErasure$.transformInfo(TypeErasure.scala:202)
[error] dotty.tools.dotc.transform.Erasure.transform(Erasure.scala:82)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] dotty.tools.dotc.core.Symbols$.toDenot(Symbols.scala:487)
[error] dotty.tools.dotc.transform.Mixin.needsTraitSetter(Mixin.scala:167)
[error] dotty.tools.dotc.transform.Mixin.transformSym$$anonfun$1(Mixin.scala:147)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.core.Scopes$Scope.foreach(Scopes.scala:94)
[error] dotty.tools.dotc.transform.Mixin.transformSym(Mixin.scala:150)
[error] dotty.tools.dotc.core.DenotTransformers$SymTransformer.transform(DenotTransformers.scala:70)
[error] dotty.tools.dotc.core.DenotTransformers$SymTransformer.transform$(DenotTransformers.scala:65)
[error] dotty.tools.dotc.transform.Mixin.transform(Mixin.scala:109)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] dotty.tools.dotc.core.Types$NamedType.computeDenot(Types.scala:2062)
[error] dotty.tools.dotc.core.Types$NamedType.denot(Types.scala:2025)
[error] dotty.tools.dotc.ast.Trees$DenotingTree.denot(Trees.scala:265)
[error] dotty.tools.dotc.ast.Trees$Tree.symbol(Trees.scala:154)
[error] dotty.tools.dotc.transform.LambdaLift$Lifter$CollectDependencies.traverse(LambdaLift.scala:196)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.foldOver(Trees.scala:1480)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.traverseChildren(Trees.scala:1516)
[error] dotty.tools.dotc.transform.LambdaLift$Lifter$CollectDependencies.traverse(LambdaLift.scala:250)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.fold$1(Trees.scala:1390)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.apply(Trees.scala:1392)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.foldOver(Trees.scala:1487)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.traverseChildren(Trees.scala:1516)
[error] dotty.tools.dotc.transform.LambdaLift$Lifter$CollectDependencies.traverse(LambdaLift.scala:250)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.foldOver(Trees.scala:1484)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.traverseChildren(Trees.scala:1516)
[error] dotty.tools.dotc.transform.LambdaLift$Lifter$CollectDependencies.traverse(LambdaLift.scala:250)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.fold$1(Trees.scala:1390)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.apply(Trees.scala:1392)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.foldOver(Trees.scala:1491)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.traverseChildren(Trees.scala:1516)
[error] dotty.tools.dotc.transform.LambdaLift$Lifter$CollectDependencies.traverse(LambdaLift.scala:250)
[error] dotty.tools.dotc.transform.LambdaLift$Lifter.<init>(LambdaLift.scala:374)
[error] dotty.tools.dotc.transform.LambdaLift.prepareForUnit(LambdaLift.scala:531)
[error] dotty.tools.dotc.transform.MegaPhase.prepUnit(MegaPhase.scala:1040)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnit(MegaPhase.scala:447)
[error] dotty.tools.dotc.transform.MegaPhase.run(MegaPhase.scala:460)
[error] dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:296)
[error] scala.collection.immutable.List.map(List.scala:246)
[error] dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:297)
[error] dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:185)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
[error] dotty.tools.dotc.Run.runPhases$5(Run.scala:195)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:203)
[error] dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:210)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:147)
[error] dotty.tools.dotc.Run.compile(Run.scala:129)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:38)
[error] dotty.tools.dotc.Driver.process(Driver.scala:195)
[error] dotty.tools.dotc.Main.process(Main.scala)
[error] xsbt.CachedCompilerImpl.run(CachedCompilerImpl.java:69)
[error] xsbt.CompilerInterface.run(CompilerInterface.java:41)
[error] java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error] java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] java.base/java.lang.reflect.Method.invoke(Method.java:566)
[error] sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:248)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:122)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:95)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:91)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:186)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3$adapted(MixedAnalyzingCompiler.scala:77)
[error] sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:215)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:77)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:146)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:343)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:343)
[error] sbt.internal.inc.Incremental$.doCompile(Incremental.scala:120)
[error] sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:100)
[error] sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:180)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:98)
[error] sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:102)
[error] sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:155)
[error] sbt.internal.inc.Incremental$.compile(Incremental.scala:92)
[error] sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:75)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:348)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:301)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:168)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:248)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:74)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1765)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1738)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error] sbt.std.Transform$$anon$4.work(Transform.scala:67)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:281)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:19)
[error] sbt.Execute.work(Execute.scala:290)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:281)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[error] java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[error] java.base/java.lang.Thread.run(Thread.java:834)
[error]
[error] dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait T from /home/tgrigg/.ivy2/local/io.grigg/p9976-lib_2.13/1.0/jars/p9976-lib_2.13.jar(p9976/T.class):
[error] error occurred at position 199: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$)
[error] 	at dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler.errorBadSignature(Scala2Unpickler.scala:157)
[error] 	at dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler.handleRuntimeException(Scala2Unpickler.scala:164)
[error] 	at dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$LocalUnpickler.complete(Scala2Unpickler.scala:606)
[error] 	at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:166)
[error] 	at dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:188)
[error] 	at dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:190)
[error] 	at dotty.tools.dotc.core.DenotTransformers$InfoTransformer.transform(DenotTransformers.scala:42)
[error] 	at dotty.tools.dotc.core.DenotTransformers$InfoTransformer.transform$(DenotTransformers.scala:34)
[error] 	at dotty.tools.dotc.transform.FirstTransform.transform(FirstTransform.scala:36)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] 	at dotty.tools.dotc.core.Symbols$.toDenot(Symbols.scala:487)
[error] 	at dotty.tools.dotc.core.SymDenotations$ClassDenotation.registeredCompanion(SymDenotations.scala:2146)
[error] 	at dotty.tools.dotc.core.SymDenotations$SymDenotation.companionType(SymDenotations.scala:1168)
[error] 	at dotty.tools.dotc.core.SymDenotations$SymDenotation.companionClass(SymDenotations.scala:1175)
[error] 	at dotty.tools.dotc.core.SymDenotations$SymDenotation.linkedClass(SymDenotations.scala:1216)
[error] 	at dotty.tools.dotc.transform.ExtensionMethods.transform(ExtensionMethods.scala:58)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] 	at dotty.tools.dotc.transform.ValueClasses$.isDerivedValueClass(ValueClasses.scala:17)
[error] 	at dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$apply(TypeErasure.scala:447)
[error] 	at dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$eraseResult(TypeErasure.scala:580)
[error] 	at dotty.tools.dotc.core.TypeErasure.eraseInfo(TypeErasure.scala:547)
[error] 	at dotty.tools.dotc.core.TypeErasure$.transformInfo(TypeErasure.scala:202)
[error] 	at dotty.tools.dotc.transform.Erasure.transform(Erasure.scala:82)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.recomputeDenot(Symbols.scala:119)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.computeDenot(Symbols.scala:113)
[error] 	at dotty.tools.dotc.core.Symbols$Symbol.denot(Symbols.scala:106)
[error] 	at dotty.tools.dotc.core.Symbols$.toDenot(Symbols.scala:487)
[error] 	at dotty.tools.dotc.transform.Mixin.needsTraitSetter(Mixin.scala:167)
[error] 	at dotty.tools.dotc.transform.Mixin.transformSym$$anonfun$1(Mixin.scala:147)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] 	at scala.collection.immutable.List.foreach(List.scala:333)
[error] 	at dotty.tools.dotc.core.Scopes$Scope.foreach(Scopes.scala:94)
[error] 	at dotty.tools.dotc.transform.Mixin.transformSym(Mixin.scala:150)
[error] 	at dotty.tools.dotc.core.DenotTransformers$SymTransformer.transform(DenotTransformers.scala:70)
[error] 	at dotty.tools.dotc.core.DenotTransformers$SymTransformer.transform$(DenotTransformers.scala:65)
[error] 	at dotty.tools.dotc.transform.Mixin.transform(Mixin.scala:109)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:803)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.goForward$1(Denotations.scala:823)
[error] 	at dotty.tools.dotc.core.Denotations$SingleDenotation.current(Denotations.scala:852)
[error] 	at dotty.tools.dotc.core.Types$NamedType.computeDenot(Types.scala:2062)
[error] 	at dotty.tools.dotc.core.Types$NamedType.denot(Types.scala:2025)
[error] 	at dotty.tools.dotc.ast.Trees$DenotingTree.denot(Trees.scala:265)
[error] 	at dotty.tools.dotc.ast.Trees$Tree.symbol(Trees.scala:154)
[error] 	at dotty.tools.dotc.transform.LambdaLift$Lifter$CollectDependencies.traverse(LambdaLift.scala:196)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.foldOver(Trees.scala:1480)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.traverseChildren(Trees.scala:1516)
[error] 	at dotty.tools.dotc.transform.LambdaLift$Lifter$CollectDependencies.traverse(LambdaLift.scala:250)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.fold$1(Trees.scala:1390)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.apply(Trees.scala:1392)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.foldOver(Trees.scala:1487)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.traverseChildren(Trees.scala:1516)
[error] 	at dotty.tools.dotc.transform.LambdaLift$Lifter$CollectDependencies.traverse(LambdaLift.scala:250)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.foldOver(Trees.scala:1484)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.traverseChildren(Trees.scala:1516)
[error] 	at dotty.tools.dotc.transform.LambdaLift$Lifter$CollectDependencies.traverse(LambdaLift.scala:250)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.apply(Trees.scala:1515)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.fold$1(Trees.scala:1390)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.apply(Trees.scala:1392)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.foldOver(Trees.scala:1491)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.traverseChildren(Trees.scala:1516)
[error] 	at dotty.tools.dotc.transform.LambdaLift$Lifter$CollectDependencies.traverse(LambdaLift.scala:250)
[error] 	at dotty.tools.dotc.transform.LambdaLift$Lifter.<init>(LambdaLift.scala:374)
[error] 	at dotty.tools.dotc.transform.LambdaLift.prepareForUnit(LambdaLift.scala:531)
[error] 	at dotty.tools.dotc.transform.MegaPhase.prepUnit(MegaPhase.scala:1040)
[error] 	at dotty.tools.dotc.transform.MegaPhase.transformUnit(MegaPhase.scala:447)
[error] 	at dotty.tools.dotc.transform.MegaPhase.run(MegaPhase.scala:460)
[error] 	at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:296)
[error] 	at scala.collection.immutable.List.map(List.scala:246)
[error] 	at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:297)
[error] 	at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:185)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] 	at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
[error] 	at dotty.tools.dotc.Run.runPhases$5(Run.scala:195)
[error] 	at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:203)
[error] 	at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] 	at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] 	at dotty.tools.dotc.Run.compileUnits(Run.scala:210)
[error] 	at dotty.tools.dotc.Run.compileSources(Run.scala:147)
[error] 	at dotty.tools.dotc.Run.compile(Run.scala:129)
[error] 	at dotty.tools.dotc.Driver.doCompile(Driver.scala:38)
[error] 	at dotty.tools.dotc.Driver.process(Driver.scala:195)
[error] 	at dotty.tools.dotc.Main.process(Main.scala)
[error] 	at xsbt.CachedCompilerImpl.run(CachedCompilerImpl.java:69)
[error] 	at xsbt.CompilerInterface.run(CompilerInterface.java:41)
[error] 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error] 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] 	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[error] 	at sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:248)
[error] 	at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:122)
[error] 	at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:95)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:91)
[error] 	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:186)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3$adapted(MixedAnalyzingCompiler.scala:77)
[error] 	at sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:215)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:77)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:146)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:343)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:343)
[error] 	at sbt.internal.inc.Incremental$.doCompile(Incremental.scala:120)
[error] 	at sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:100)
[error] 	at sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:180)
[error] 	at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:98)
[error] 	at sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:102)
[error] 	at sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:155)
[error] 	at sbt.internal.inc.Incremental$.compile(Incremental.scala:92)
[error] 	at sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:75)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:348)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:301)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:168)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:248)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:74)
[error] 	at sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1765)
[error] 	at sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1738)
[error] 	at scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] 	at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error] 	at sbt.std.Transform$$anon$4.work(Transform.scala:67)
[error] 	at sbt.Execute.$anonfun$submit$2(Execute.scala:281)
[error] 	at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:19)
[error] 	at sbt.Execute.work(Execute.scala:290)
[error] 	at sbt.Execute.$anonfun$submit$1(Execute.scala:281)
[error] 	at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] 	at sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] 	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[error] 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[error] 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[error] 	at java.base/java.lang.Thread.run(Thread.java:834)
[error] (Compile / compileIncremental) dotty.tools.dotc.core.unpickleScala2.Scala2Unpickler$BadSignature: error reading Scala signature of trait T from /home/tgrigg/.ivy2/local/io.grigg/p9976-lib_2.13/1.0/jars/p9976-lib_2.13.jar(p9976/T.class):
[error] error occurred at position 199: a runtime exception occurred: scala.MatchError: NoType (of class dotty.tools.dotc.core.Types$NoType$)

smarter added a commit to dotty-staging/dotty that referenced this pull request Oct 14, 2020
@smarter
Fix scala#9916: Properly unpickle non-toplevel Scala 2 objects
634f070 
Test cases from scala#9976.
@smarter smarter mentioned this pull request Oct 14, 2020
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smarter commented Oct 14, 2020

I've created a PR at #10006 which passes the testcases from this PR, thanks for the investigation @griggt !

@smarter smarter closed this Oct 14, 2020
smarter added a commit to dotty-staging/dotty that referenced this pull request Oct 14, 2020
@smarter
Fix scala#9916: Properly unpickle non-toplevel Scala 2 objects
88eea1b 
Test cases from scala#9976.
smarter added a commit to dotty-staging/dotty that referenced this pull request Oct 14, 2020
@smarter
Fix scala#9916: Properly unpickle non-toplevel Scala 2 objects
448af4c 
Test cases from scala#9976.
@griggt griggt deleted the fix-#9916 branch March 17, 2021 00:17
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