Assertion being thrown in a normal compilation

[tgodzik]

Compiler version

3.5.0 (though this probably also happens on latest)

Minimized code

It can probably happen in any code, but it needs to compile from Metals and from Scala CLI at the same time.

println("hello, world")

Though, the thing is that we don't compile anything simultaneously, so it's pretty weird to happen. This might actually be some incremental compilation issue.

Output

Error compiling project (Scala 3.5.0, JVM (17))
Error: Unexpected error when compiling aoc-scala_bde03bda35-5224438d5a: java.lang.AssertionError: assertion failed: asTerm called on not-a-Term val <none>
        at scala.runtime.Scala3RunTime$.assertFailed(Scala3RunTime.scala:8)
        at dotty.tools.dotc.core.Symbols$Symbol.asTerm(Symbols.scala:186)
        at dotty.tools.dotc.core.Definitions.ObjectClass(Definitions.scala:325)
        at dotty.tools.dotc.core.Definitions.ObjectType(Definitions.scala:329)
        at dotty.tools.dotc.core.Definitions.AnyRefAlias(Definitions.scala:428)
        at dotty.tools.dotc.core.Definitions.syntheticScalaClasses(Definitions.scala:2163)
        at dotty.tools.dotc.core.Definitions.syntheticCoreClasses(Definitions.scala:2176)
        at dotty.tools.dotc.core.Definitions.init(Definitions.scala:2192)
        at dotty.tools.dotc.core.Contexts$ContextBase.initialize(Contexts.scala:921)
        at dotty.tools.dotc.core.Contexts$Context.initialize(Contexts.scala:544)
        at dotty.tools.dotc.Run.rootContext(Run.scala:503)
        at dotty.tools.dotc.Run.<init>(Run.scala:524)
        at dotty.tools.dotc.Compiler.newRun(Compiler.scala:174)
        at dotty.tools.dotc.Driver.doCompile(Driver.scala:35)
        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$1(BloopHighLevelCompiler.scala:133)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.$anonfun$compile$7(BloopHighLevelCompiler.scala:159)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.$anonfun$compile$1(BloopHighLevelCompiler.scala:71)
        at bloop.tracing.NoopTracer$.trace(BraveTracer.scala:53)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.timed$1(BloopHighLevelCompiler.scala:70)
        at sbt.internal.inc.bloop.internal.BloopHighLevelCompiler.$anonfun$compile$6(BloopHighLevelCompiler.scala:159)
        at scala.runtime.java8.JFunction0$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.compute(ForkJoinTask.java:1726)
        at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.compute(ForkJoinTask.java:1717)
        at java.base/java.util.concurrent.ForkJoinTask$InterruptibleTask.exec(ForkJoinTask.java:1641)
        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:507)
        at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1489)
        at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:2071)
        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2033)
        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)

Judging by the stack trace, could this be a similar issue as scala/bug#13045 ?

Expectation

The compiler should provide more information about what is going on, having an assertion thrown here doesn't give us a lot of information.

[Gedochao]

Note: tagged it as stat:cannot reproduce, as we do not have a reliable method of reproduction, but we've seen this being reported for a long while.
Some investigation around the assertion check independently would perhaps be useful.