invalid prefix NoType when using report.errorAndAbort

[TomasMikula]

Compiler version

3.3.3
3.4.0
3.4.1-RC1

Minimized code

import scala.quoted.*

opaque type Box[A] = Any

object Box {
  transparent inline def pack[A]: Nothing => Box[A] =
    ${ packImpl[A] }

  private def packImpl[A](using
    Quotes,
    Type[A],
  ): Expr[Nothing => Box[A]] =
    import quotes.reflect.*
    report.errorAndAbort("Not implemented")
}

def main: Unit =
  Box.pack[Int]

Output (click arrow to expand)

[error] -- Error: /Users/tomas/tmp/scalac-crash-invalid-prefix-NoType/use.scala:2:10 ---
[error] 2 |  Box.pack[Int]
[error]   |  ^^^^^^^^^^^^^
[error]   |  Not implemented
[info] 
[info]   exception occurred while typechecking /Users/tomas/tmp/scalac-crash-invalid-prefix-NoType/use.scala
[info] 
[info]   An unhandled exception was thrown in the compiler.
[info]   Please file a crash report here:
[info]   https://github.com/lampepfl/dotty/issues/new/choose
[info]   For non-enriched exceptions, compile with -Yno-enrich-error-messages.
[info] 
[info]      while compiling: /Users/tomas/tmp/scalac-crash-invalid-prefix-NoType/use.scala
[info]         during phase: typer
[info]                 mode: Mode(ImplicitsEnabled)
[info]      library version: version 2.13.12
[info]     compiler version: version 3.4.0
[info]             settings: -bootclasspath /Users/tomas/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala3-library_3/3.4.0/scala3-library_3-3.4.0.jar:/Users/tomas/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.12/scala-library-2.13.12.jar -classpath /Users/tomas/tmp/scalac-crash-invalid-prefix-NoType/target/scala-3.4.0/classes -d /Users/tomas/tmp/scalac-crash-invalid-prefix-NoType/target/scala-3.4.0/classes

  Exception while compiling /Users/tomas/tmp/scalac-crash-invalid-prefix-NoType/defns.scala, /Users/tomas/tmp/scalac-crash-invalid-prefix-NoType/use.scala

  An unhandled exception was thrown in the compiler.
  Please file a crash report here:
  https://github.com/lampepfl/dotty/issues/new/choose
  For non-enriched exceptions, compile with -Yno-enrich-error-messages.

     while compiling: <no file>
        during phase: parser
                mode: Mode()
     library version: version 2.13.12
    compiler version: version 3.4.0
            settings: -bootclasspath /Users/tomas/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala3-library_3/3.4.0/scala3-library_3-3.4.0.jar:/Users/tomas/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.12/scala-library-2.13.12.jar -classpath /Users/tomas/tmp/scalac-crash-invalid-prefix-NoType/target/scala-3.4.0/classes -d /Users/tomas/tmp/scalac-crash-invalid-prefix-NoType/target/scala-3.4.0/classes

[error] ## Exception when compiling 2 sources to /Users/tomas/tmp/scalac-crash-invalid-prefix-NoType/target/scala-3.4.0/classes
[error] java.lang.AssertionError: assertion failed: invalid prefix NoType
[error] scala.runtime.Scala3RunTime$.assertFailed(Scala3RunTime.scala:8)
[error] dotty.tools.dotc.core.Types$NamedType.<init>(Types.scala:2296)
[error] dotty.tools.dotc.core.Types$TermRef.<init>(Types.scala:2901)
[error] dotty.tools.dotc.core.Types$CachedTermRef.<init>(Types.scala:2998)
[error] dotty.tools.dotc.core.Uniques$NamedTypeUniques.newType$1(Uniques.scala:44)
[error] dotty.tools.dotc.core.Uniques$NamedTypeUniques.linkedListLoop$1(Uniques.scala:56)
[error] dotty.tools.dotc.core.Uniques$NamedTypeUniques.enterIfNew(Uniques.scala:62)
[error] dotty.tools.dotc.core.Types$TermRef$.apply(Types.scala:3052)
[error] dotty.tools.dotc.core.Types$TermRef$.apply(Types.scala:3058)
[error] dotty.tools.dotc.ast.tpd$TreeOps$.select$extension(tpd.scala:930)
[error] dotty.tools.dotc.ast.tpd$TreeOps$.cast$extension(tpd.scala:1028)
[error] dotty.tools.dotc.ast.tpd$TreeOps$.cast$extension(tpd.scala:1023)
[error] dotty.tools.dotc.ast.tpd$TreeOps$.ensureConforms$extension(tpd.scala:1037)
[error] dotty.tools.dotc.inlines.Inlines$InlineCall.expand(Inlines.scala:491)
[error] dotty.tools.dotc.inlines.Inlines$.inlineCall(Inlines.scala:152)
[error] dotty.tools.dotc.typer.Typer.adaptNoArgsOther$1(Typer.scala:4048)
[error] dotty.tools.dotc.typer.Typer.adaptNoArgs$1(Typer.scala:4156)
[error] dotty.tools.dotc.typer.Typer.adapt1(Typer.scala:4368)
[error] dotty.tools.dotc.typer.Typer.adapt(Typer.scala:3679)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3275)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3279)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3391)
[error] dotty.tools.dotc.typer.Typer.$anonfun$62(Typer.scala:2602)
[error] dotty.tools.dotc.inlines.PrepareInlineable$.dropInlineIfError(PrepareInlineable.scala:256)
[error] dotty.tools.dotc.typer.Typer.typedDefDef(Typer.scala:2602)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:3096)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3197)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3275)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3279)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3301)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3347)
[error] dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:2789)
[error] dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$1(Typer.scala:3102)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:3106)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3197)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3275)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3279)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3301)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3347)
[error] dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:2922)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3148)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3198)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3275)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3279)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3391)
[error] dotty.tools.dotc.typer.TyperPhase.typeCheck$$anonfun$1(TyperPhase.scala:47)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.core.Phases$Phase.monitor(Phases.scala:477)
[error] dotty.tools.dotc.typer.TyperPhase.typeCheck(TyperPhase.scala:53)
[error] dotty.tools.dotc.typer.TyperPhase.$anonfun$4(TyperPhase.scala:99)
[error] scala.collection.Iterator$$anon$6.hasNext(Iterator.scala:479)
[error] scala.collection.Iterator$$anon$9.hasNext(Iterator.scala:583)
[error] scala.collection.immutable.List.prependedAll(List.scala:152)
[error] scala.collection.immutable.List$.from(List.scala:684)
[error] scala.collection.immutable.List$.from(List.scala:681)
[error] scala.collection.IterableOps$WithFilter.map(Iterable.scala:898)
[error] dotty.tools.dotc.typer.TyperPhase.runOn(TyperPhase.scala:100)
[error] dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:315)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
[error] dotty.tools.dotc.Run.runPhases$1(Run.scala:337)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:348)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:357)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:71)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:357)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:267)
[error] dotty.tools.dotc.Driver.finish(Driver.scala:58)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:38)
[error] dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:141)
[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$5(Incremental.scala:180)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:178)
[error] sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:464)
[error] sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:263)
[error] sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:419)
[error] sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:506)
[error] sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:406)
[error] sbt.internal.inc.Incremental$.apply(Incremental.scala:172)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:488)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:425)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2371)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2321)
[error] sbt.internal.server.BspCompileTask$.$anonfun$compute$1(BspCompileTask.scala:31)
[error] sbt.internal.io.Retry$.apply(Retry.scala:47)
[error] sbt.internal.io.Retry$.apply(Retry.scala:29)
[error] sbt.internal.io.Retry$.apply(Retry.scala:24)
[error] sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:31)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2319)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:63)
[error] sbt.std.Transform$$anon$4.work(Transform.scala:69)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:283)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:24)
[error] sbt.Execute.work(Execute.scala:292)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:283)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:65)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
[error] java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
[error] java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
[error] java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
[error] java.base/java.lang.Thread.run(Thread.java:1583)
[error]            
[error] stack trace is suppressed; run last Compile / compileIncremental for the full output
[error] (Compile / compileIncremental) java.lang.AssertionError: assertion failed: invalid prefix NoType
[error] Total time: 0 s, completed Mar 1, 2024, 9:19:50 PM

Expected

The compiler should not crash and only report the explicit compilation error:

[error] 2 |  Box.pack[Int]
[error]   |  ^^^^^^^^^^^^^
[error]   |  Not implemented

[soronpo]

Possible workaround:
Return the expression

'{compiletime.error("Not implemented")}

[TomasMikula]

Possible workaround: Return the expression

'{compiletime.error("Not implemented")}

That would work for expressions, but sometimes I also want to errorAndAbort("Not implemented") from a method returning a Type[A].