Crash on ScalaFX 16.0.0-R24 hello world

[pubnoconst]

Compiler version

3.6.2

Minimized code

//> using dep "org.scalafx::scalafx:16.0.0-R24"

import scalafx.application.JFXApp3
import scalafx.scene.Scene
import scalafx.scene.control.Label

object HelloWorld extends JFXApp3:
  override def start(): Unit =
    stage = new JFXApp3.PrimaryStage:
      title = "ScalaFX Hello World"
      scene = new Scene(400, 300):
        content = new Label("Hello, World!")

Output (click arrow to expand)

$scala run .\src\Main.scala
Compiling project (Scala 3.6.2, JVM (19))

  exception occurred while typechecking C:\Users\relay\proj\scalafxbed\src\Main.scala

  An unhandled exception was thrown in the compiler.
  Please file a crash report here:
  https://github.com/scala/scala3/issues/new/choose
  For non-enriched exceptions, compile with -Xno-enrich-error-messages.

     while compiling: C:\Users\relay\proj\scalafxbed\src\Main.scala
        during phase: typer
                mode: Mode(ImplicitsEnabled)
     library version: version 2.13.15
    compiler version: version 3.6.2
            settings: -bootclasspath C:\Users\relay\scoop\apps\scala\current\maven2\org\scala-lang\scala3-library_3\3.6.2\scala3-library_3-3.6.2.jar;C:\Users\relay\scoop\apps\scala\current\maven2\org\scala-lang\scala-library\2.13.15\scala-library-2.13.15.jar -classpath C:\Users\relay\proj\scalafxbed\src\.scala-build\.bloop\src_5d71158a2d-ac99cb1497\bloop-internal-classes\main-bJh-onUhT2KO2SsQsoPtcQ==;C:\Users\relay\proj\scalafxbed\src\.scala-build\src_5d71158a2d-ac99cb1497\classes\classes-empty-src_5d71158a2d-ac99cb1497;C:\Users\relay\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scalafx\scalafx_3\16.0.0-R24\scalafx_3-16.0.0-R24.jar -d C:\Users\relay\proj\scalafxbed\src\.scala-build\.bloop\src_5d71158a2d-ac99cb1497\bloop-internal-classes\main-bJh-onUhT2KO2SsQsoPtcQ== -sourceroot C:\Users\relay\proj\scalafxbed\src

Error compiling project (Scala 3.6.2, JVM (19))
Error: java.lang.AssertionError: assertion failed: class Window has non-class parent: TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class javafx)),object event),EventTarget)
        at scala.runtime.Scala3RunTime$.assertFailed(Scala3RunTime.scala:8)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.traverse$1(SymDenotations.scala:2007)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.computeBaseData(SymDenotations.scala:2012)
        at dotty.tools.dotc.core.SymDenotations$BaseDataImpl.apply(SymDenotations.scala:3005)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseData(SymDenotations.scala:1978)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseClasses(SymDenotations.scala:1985)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.traverse$1(SymDenotations.scala:2006)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.computeBaseData(SymDenotations.scala:2012)
        at dotty.tools.dotc.core.SymDenotations$BaseDataImpl.apply(SymDenotations.scala:3005)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseData(SymDenotations.scala:1978)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseClasses(SymDenotations.scala:1985)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.traverse$1(SymDenotations.scala:2006)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.computeBaseData(SymDenotations.scala:2012)
        at dotty.tools.dotc.core.SymDenotations$BaseDataImpl.apply(SymDenotations.scala:3005)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseData(SymDenotations.scala:1978)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseClassSet(SymDenotations.scala:1994)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.derivesFrom(SymDenotations.scala:2020)
        at dotty.tools.dotc.core.Types$Type.loop$1(Types.scala:286)
        at dotty.tools.dotc.core.Types$Type.derivesFrom(Types.scala:310)
        at dotty.tools.dotc.typer.Namer$ClassCompleter.checkedParentType$1(Namer.scala:1618)
        at dotty.tools.dotc.typer.Namer$ClassCompleter.$anonfun$29(Namer.scala:1704)
        at scala.collection.immutable.List.map(List.scala:247)
        at dotty.tools.dotc.typer.Namer$ClassCompleter.completeInCreationContext(Namer.scala:1704)
        at dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:859)
        at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:175)
        at dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:190)
        at dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:192)
        at dotty.tools.dotc.core.SymDenotations$SymDenotation.ensureCompleted(SymDenotations.scala:393)
        at dotty.tools.dotc.typer.Typer.retrieveSym(Typer.scala:3443)
        at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:3468)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3580)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3684)
        at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3730)
        at dotty.tools.dotc.typer.Typer.typedBlockStats(Typer.scala:1427)
        at dotty.tools.dotc.typer.Typer.typedBlock(Typer.scala:1431)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3504)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3581)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.typedNew(Typer.scala:1152)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3500)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3581)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.typedAssign(Typer.scala:1403)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3503)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3581)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3773)
        at dotty.tools.dotc.typer.Typer.$anonfun$66(Typer.scala:2897)
        at dotty.tools.dotc.inlines.PrepareInlineable$.dropInlineIfError(PrepareInlineable.scala:256)
        at dotty.tools.dotc.typer.Typer.typedDefDef(Typer.scala:2897)
        at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:3478)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3580)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3684)
        at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3730)
        at dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:3160)
        at dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$1(Typer.scala:3484)
        at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:3488)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3580)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3684)
        at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3730)
        at dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:3293)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3530)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3581)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3773)
        at dotty.tools.dotc.typer.TyperPhase.typeCheck$$anonfun$1(TyperPhase.scala:47)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at dotty.tools.dotc.core.Phases$Phase.monitor(Phases.scala:507)
        at dotty.tools.dotc.typer.TyperPhase.typeCheck(TyperPhase.scala:53)
        at dotty.tools.dotc.typer.TyperPhase.$anonfun$4(TyperPhase.scala:99)
        at scala.collection.Iterator$$anon$6.hasNext(Iterator.scala:479)
        at scala.collection.Iterator$$anon$9.hasNext(Iterator.scala:583)
        at scala.collection.immutable.List.prependedAll(List.scala:152)
        at scala.collection.immutable.List$.from(List.scala:685)
        at scala.collection.immutable.List$.from(List.scala:682)
        at scala.collection.IterableOps$WithFilter.map(Iterable.scala:900)
        at dotty.tools.dotc.typer.TyperPhase.runOn(TyperPhase.scala:98)
        at dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:343)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
        at dotty.tools.dotc.Run.runPhases$1(Run.scala:336)
        at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:384)
        at dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:396)
        at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:69)
        at dotty.tools.dotc.Run.compileUnits(Run.scala:396)
        at dotty.tools.dotc.Run.compileSources(Run.scala:282)
        at dotty.tools.dotc.Run.compile(Run.scala:267)
        at dotty.tools.dotc.Driver.doCompile(Driver.scala:37)
        at dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:141)
        at dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
        at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.compileSources$1(BloopHighLevelCompiler.scala:148)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.$anonfun$compile$9(BloopHighLevelCompiler.scala:181)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.$anonfun$compile$1(BloopHighLevelCompiler.scala:73)
        at bloop.tracing.NoopTracer$.trace(BraveTracer.scala:53)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.timed$1(BloopHighLevelCompiler.scala:72)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.$anonfun$compile$8(BloopHighLevelCompiler.scala:181)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
        at monix.eval.internal.TaskRunLoop$.startFull(TaskRunLoop.scala:81)
        at monix.eval.internal.TaskRestartCallback.syncOnSuccess(TaskRestartCallback.scala:101)
        at monix.eval.internal.TaskRestartCallback.onSuccess(TaskRestartCallback.scala:74)
        at monix.eval.internal.TaskExecuteOn$AsyncRegister$$anon$1.run(TaskExecuteOn.scala:71)
        at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1423)
        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
        at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1311)
        at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1841)
        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1806)
        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

Error: Unexpected error when compiling src_5d71158a2d-ac99cb1497: java.lang.AssertionError: assertion failed: class Window has non-class parent: TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class javafx)),object event),EventTarget)
        at scala.runtime.Scala3RunTime$.assertFailed(Scala3RunTime.scala:8)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.traverse$1(SymDenotations.scala:2007)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.computeBaseData(SymDenotations.scala:2012)
        at dotty.tools.dotc.core.SymDenotations$BaseDataImpl.apply(SymDenotations.scala:3005)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseData(SymDenotations.scala:1978)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseClasses(SymDenotations.scala:1985)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.traverse$1(SymDenotations.scala:2006)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.computeBaseData(SymDenotations.scala:2012)
        at dotty.tools.dotc.core.SymDenotations$BaseDataImpl.apply(SymDenotations.scala:3005)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseData(SymDenotations.scala:1978)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseClasses(SymDenotations.scala:1985)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.traverse$1(SymDenotations.scala:2006)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.computeBaseData(SymDenotations.scala:2012)
        at dotty.tools.dotc.core.SymDenotations$BaseDataImpl.apply(SymDenotations.scala:3005)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseData(SymDenotations.scala:1978)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.baseClassSet(SymDenotations.scala:1994)
        at dotty.tools.dotc.core.SymDenotations$ClassDenotation.derivesFrom(SymDenotations.scala:2020)
        at dotty.tools.dotc.core.Types$Type.loop$1(Types.scala:286)
        at dotty.tools.dotc.core.Types$Type.derivesFrom(Types.scala:310)
        at dotty.tools.dotc.typer.Namer$ClassCompleter.checkedParentType$1(Namer.scala:1618)
        at dotty.tools.dotc.typer.Namer$ClassCompleter.$anonfun$29(Namer.scala:1704)
        at scala.collection.immutable.List.map(List.scala:247)
        at dotty.tools.dotc.typer.Namer$ClassCompleter.completeInCreationContext(Namer.scala:1704)
        at dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:859)
        at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:175)
        at dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:190)
        at dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:192)
        at dotty.tools.dotc.core.SymDenotations$SymDenotation.ensureCompleted(SymDenotations.scala:393)
        at dotty.tools.dotc.typer.Typer.retrieveSym(Typer.scala:3443)
        at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:3468)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3580)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3684)
        at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3730)
        at dotty.tools.dotc.typer.Typer.typedBlockStats(Typer.scala:1427)
        at dotty.tools.dotc.typer.Typer.typedBlock(Typer.scala:1431)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3504)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3581)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.typedNew(Typer.scala:1152)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3500)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3581)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.typedAssign(Typer.scala:1403)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3503)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3581)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3773)
        at dotty.tools.dotc.typer.Typer.$anonfun$66(Typer.scala:2897)
        at dotty.tools.dotc.inlines.PrepareInlineable$.dropInlineIfError(PrepareInlineable.scala:256)
        at dotty.tools.dotc.typer.Typer.typedDefDef(Typer.scala:2897)
        at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:3478)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3580)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3684)
        at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3730)
        at dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:3160)
        at dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$1(Typer.scala:3484)
        at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:3488)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3580)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3684)
        at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3730)
        at dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:3293)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3530)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3581)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3658)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3662)
        at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3773)
        at dotty.tools.dotc.typer.TyperPhase.typeCheck$$anonfun$1(TyperPhase.scala:47)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at dotty.tools.dotc.core.Phases$Phase.monitor(Phases.scala:507)
        at dotty.tools.dotc.typer.TyperPhase.typeCheck(TyperPhase.scala:53)
        at dotty.tools.dotc.typer.TyperPhase.$anonfun$4(TyperPhase.scala:99)
        at scala.collection.Iterator$$anon$6.hasNext(Iterator.scala:479)
        at scala.collection.Iterator$$anon$9.hasNext(Iterator.scala:583)
        at scala.collection.immutable.List.prependedAll(List.scala:152)
        at scala.collection.immutable.List$.from(List.scala:685)
        at scala.collection.immutable.List$.from(List.scala:682)
        at scala.collection.IterableOps$WithFilter.map(Iterable.scala:900)
        at dotty.tools.dotc.typer.TyperPhase.runOn(TyperPhase.scala:98)
        at dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:343)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
        at dotty.tools.dotc.Run.runPhases$1(Run.scala:336)
        at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:384)
        at dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:396)
        at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:69)
        at dotty.tools.dotc.Run.compileUnits(Run.scala:396)
        at dotty.tools.dotc.Run.compileSources(Run.scala:282)
        at dotty.tools.dotc.Run.compile(Run.scala:267)
        at dotty.tools.dotc.Driver.doCompile(Driver.scala:37)
        at dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:141)
        at dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
        at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.compileSources$1(BloopHighLevelCompiler.scala:148)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.$anonfun$compile$9(BloopHighLevelCompiler.scala:181)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.$anonfun$compile$1(BloopHighLevelCompiler.scala:73)
        at bloop.tracing.NoopTracer$.trace(BraveTracer.scala:53)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.timed$1(BloopHighLevelCompiler.scala:72)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.$anonfun$compile$8(BloopHighLevelCompiler.scala:181)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
        at monix.eval.internal.TaskRunLoop$.startFull(TaskRunLoop.scala:81)
        at monix.eval.internal.TaskRestartCallback.syncOnSuccess(TaskRestartCallback.scala:101)
        at monix.eval.internal.TaskRestartCallback.onSuccess(TaskRestartCallback.scala:74)
        at monix.eval.internal.TaskExecuteOn$AsyncRegister$$anon$1.run(TaskExecuteOn.scala:71)
        at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1423)
        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
        at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1311)
        at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1841)
        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1806)
        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

[som-snytt]

Current version is

//> using dep "org.scalafx::scalafx:23.0.1-R34"

which just works.

For the old version, it fails to compile this way:

➜  scala-cli run --server=false -S 3.6.3 i22459.scala
-- [E006] Not Found Error: .../i22459.scala:4:7 -----------------
4 |import scalafx.application.JFXApp3
  |       ^^^^^^^
  |       Not found: scalafx

[SethTisue]

but we don't understand why OP reportedly saw "class Window has non-class parent"?

[Gedochao]

Facts are that it compiles fine with 23.0.1-R34, but with 16.0.0-R24 we get a crash on typer.
Might be worth an investigation.