Compiler crash (ClassCastException) with -Ysafe-init

[durban]

Compiler version

3.3.0

Minimized code

Full code is at https://github.com/durban/dotty-crash

package com.example


trait MySelfType

trait MyTrait extends munit.FunSuite { this: MySelfType =>

  test("foo") {
  }

  val x = ""

  test("bar") {
  }
}

abstract class MyAbstractClass extends munit.FunSuite { this: MySelfType =>

  override def munitValueTransforms: List[ValueTransform] = {
    super.munitValueTransforms
  }
}

final class MyFinalClass
  extends MyAbstractClass
  with MyTrait
  with MySelfType

Output (click arrow to expand)

sbt:dotty-crash> Test/compile
[info] compiling 1 Scala source to .../dotty-crash/target/scala-3.3.0/test-classes ...
[info] exception occurred while compiling .../dotty-crash/src/test/scala/com/example/Foo.scala
java.lang.ClassCastException: class dotty.tools.dotc.core.Symbols$NoSymbol$ cannot be cast to class dotty.tools.dotc.core.Symbols$ClassSymbol (dotty.tools.dotc.core.Symbols$NoSymbol$ and dotty.tools.dotc.core.Symbols$ClassSymbol are in unnamed module of loader sbt.internal.classpath.ClassLoaderCache$Key$CachedClassLoader @155f058) while compiling .../dotty-crash/src/test/scala/com/example/Foo.scala
[error] ## Exception when compiling 1 sources to .../dotty-crash/target/scala-3.3.0/test-classes
[error] java.lang.ClassCastException: class dotty.tools.dotc.core.Symbols$NoSymbol$ cannot be cast to class dotty.tools.dotc.core.Symbols$ClassSymbol (dotty.tools.dotc.core.Symbols$NoSymbol$ and dotty.tools.dotc.core.Symbols$ClassSymbol are in unnamed module of loader sbt.internal.classpath.ClassLoaderCache$Key$CachedClassLoader @155f058)
[error] dotty.tools.dotc.core.Symbols$Symbol.asClass(Symbols.scala:178)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$42(Semantic.scala:1342)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1342)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1418)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$11(Semantic.scala:813)
[error] dotty.tools.dotc.transform.init.Semantic$.call(Semantic.scala:812)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$45(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1346)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1346)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1346)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1466)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$2(Semantic.scala:1290)
[error] scala.collection.immutable.List.map(List.scala:246)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1290)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1417)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$31(Semantic.scala:1103)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.transform.init.Semantic$Reporter$.stopEarly(Semantic.scala:542)
[error] dotty.tools.dotc.transform.init.Semantic$.promote(Semantic.scala:1107)
[error] dotty.tools.dotc.transform.init.Semantic$ArgInfo.$anonfun$39(Semantic.scala:1258)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.transform.init.Semantic$ArgInfo.promote(Semantic.scala:1257)
[error] dotty.tools.dotc.transform.init.Semantic$.promoteArgs$1$$anonfun$1(Semantic.scala:717)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.transform.init.Semantic$.promoteArgs$1(Semantic.scala:717)
[error] dotty.tools.dotc.transform.init.Semantic$.call(Semantic.scala:777)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$45(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1466)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$2(Semantic.scala:1290)
[error] scala.collection.immutable.List.map(List.scala:246)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1290)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1417)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$11(Semantic.scala:813)
[error] dotty.tools.dotc.transform.init.Semantic$.call(Semantic.scala:812)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$47(Semantic.scala:1359)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1359)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1418)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$11(Semantic.scala:813)
[error] dotty.tools.dotc.transform.init.Semantic$.call(Semantic.scala:812)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$45(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$31(Semantic.scala:1103)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.transform.init.Semantic$Reporter$.stopEarly(Semantic.scala:542)
[error] dotty.tools.dotc.transform.init.Semantic$.promote(Semantic.scala:1107)
[error] dotty.tools.dotc.transform.init.Semantic$ArgInfo.$anonfun$39(Semantic.scala:1258)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.transform.init.Semantic$ArgInfo.promote(Semantic.scala:1257)
[error] dotty.tools.dotc.transform.init.Semantic$.promoteArgs$1$$anonfun$1(Semantic.scala:717)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.transform.init.Semantic$.promoteArgs$1(Semantic.scala:717)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$10(Semantic.scala:802)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.transform.init.Semantic$Reporter$.errorsIn(Semantic.scala:534)
[error] dotty.tools.dotc.transform.init.Semantic$.call(Semantic.scala:802)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$45(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1418)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1448)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1418)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$31(Semantic.scala:1103)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.transform.init.Semantic$Reporter$.stopEarly(Semantic.scala:542)
[error] dotty.tools.dotc.transform.init.Semantic$.promote(Semantic.scala:1107)
[error] dotty.tools.dotc.transform.init.Semantic$ArgInfo.$anonfun$39(Semantic.scala:1258)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.transform.init.Semantic$ArgInfo.promote(Semantic.scala:1257)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$26(Semantic.scala:936)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.transform.init.Semantic$Reporter$.$anonfun$4(Semantic.scala:549)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.transform.init.Semantic$Reporter$.stopEarly(Semantic.scala:542)
[error] dotty.tools.dotc.transform.init.Semantic$Reporter$.hasErrors(Semantic.scala:549)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$25(Semantic.scala:936)
[error] scala.collection.immutable.List.map(List.scala:250)
[error] dotty.tools.dotc.transform.init.Semantic$.instantiate(Semantic.scala:939)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$41(Semantic.scala:1332)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1330)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.evalArgs$$anonfun$1(Semantic.scala:1300)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.transform.init.Semantic$.evalArgs(Semantic.scala:1302)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1337)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.evalArgs$$anonfun$1(Semantic.scala:1300)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.transform.init.Semantic$.evalArgs(Semantic.scala:1302)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1337)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$2(Semantic.scala:1290)
[error] scala.collection.immutable.List.map(List.scala:246)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1290)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1417)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1418)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$11(Semantic.scala:813)
[error] dotty.tools.dotc.transform.init.Semantic$.call(Semantic.scala:812)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$45(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1418)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$11(Semantic.scala:813)
[error] dotty.tools.dotc.transform.init.Semantic$.call(Semantic.scala:812)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$45(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1350)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.init$$anonfun$4(Semantic.scala:1704)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.transform.init.Semantic$.init(Semantic.scala:1705)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1481)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.$anonfun$18(Semantic.scala:894)
[error] dotty.tools.dotc.transform.init.Semantic$.callConstructor(Semantic.scala:894)
[error] dotty.tools.dotc.transform.init.Semantic$.superCall$1$$anonfun$1(Semantic.scala:1612)
[error] dotty.tools.dotc.transform.init.Semantic$.init$$anonfun$3(Semantic.scala:1677)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.IterableOnceOps.foreach(IterableOnce.scala:575)
[error] scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:573)
[error] scala.collection.AbstractIterable.foreach(Iterable.scala:933)
[error] dotty.tools.dotc.transform.init.Semantic$.init(Semantic.scala:1677)
[error] dotty.tools.dotc.transform.init.Semantic$.cases(Semantic.scala:1481)
[error] dotty.tools.dotc.transform.init.Semantic$.eval$$anonfun$1(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$Cache$Cache.assume(Semantic.scala:374)
[error] dotty.tools.dotc.transform.init.Semantic$.eval(Semantic.scala:1285)
[error] dotty.tools.dotc.transform.init.Semantic$.iterate$1(Semantic.scala:1231)
[error] dotty.tools.dotc.transform.init.Semantic$.checkClass(Semantic.scala:1242)
[error] dotty.tools.dotc.transform.init.Semantic$.checkClasses$$anonfun$2(Semantic.scala:1251)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.IterableOnceOps.foreach(IterableOnce.scala:575)
[error] scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:573)
[error] scala.collection.AbstractIterable.foreach(Iterable.scala:933)
[error] scala.collection.IterableOps$WithFilter.foreach(Iterable.scala:903)
[error] dotty.tools.dotc.transform.init.Semantic$.checkClasses(Semantic.scala:1251)
[error] dotty.tools.dotc.transform.init.Checker.runOn(Checker.scala:39)
[error] dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:247)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1321)
[error] dotty.tools.dotc.Run.runPhases$1(Run.scala:263)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:271)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:280)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:280)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:195)
[error] dotty.tools.dotc.Run.compile(Run.scala:179)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:35)
[error] dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:88)
[error] dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:193)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:248)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:183)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:163)
[error] sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:163)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:211)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:179)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:177)
[error] sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:463)
[error] sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:263)
[error] sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:418)
[error] sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:505)
[error] sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:405)
[error] sbt.internal.inc.Incremental$.apply(Incremental.scala:171)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:488)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:425)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2366)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2316)
[error] sbt.internal.server.BspCompileTask$.$anonfun$compute$1(BspCompileTask.scala:30)
[error] sbt.internal.io.Retry$.apply(Retry.scala:46)
[error] sbt.internal.io.Retry$.apply(Retry.scala:28)
[error] sbt.internal.io.Retry$.apply(Retry.scala:23)
[error] sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:30)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2314)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error] sbt.std.Transform$$anon$4.work(Transform.scala:68)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:282)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:23)
[error] sbt.Execute.work(Execute.scala:291)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:282)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:64)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
[error] java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
[error] java.base/java.lang.Thread.run(Thread.java:833)
[error]            
[error] stack trace is suppressed; run last Test / compileIncremental for the full output
[error] (Test / compileIncremental) java.lang.ClassCastException: class dotty.tools.dotc.core.Symbols$NoSymbol$ cannot be cast to class dotty.tools.dotc.core.Symbols$ClassSymbol (dotty.tools.dotc.core.Symbols$NoSymbol$ and dotty.tools.dotc.core.Symbols$ClassSymbol are in unnamed module of loader sbt.internal.classpath.ClassLoaderCache$Key$CachedClassLoader @155f058)

Note: -Ysafe-init seems to be required for the crash to happen.

[q-ata]

The project that crashes depends on munit compiled in Scala 3.

The crash seems to be a result of this line in the init checker: https://github.com/lampepfl/dotty/blob/894809278a47a5455ee12f5dfb7c16da8d641e6c/compiler/src/dotty/tools/dotc/transform/init/Semantic.scala#L1232C11-L1232C102

val thisValue2 = extendTrace(ref) { resolveThis(thisTp.classSymbol.asClass, thisV, klass) }

thisTp.classSymbol.asClass seems to be failing. The value for thisTp is ThisType(TypeRef(ThisType(TypeRef(NoPrefix,module class example)),class MyAbstractClass)). classSymbol returns NoSymbol for this class.