Encode path of class

[som-snytt]

Fixes #22866

TastyFileUtil.getClassName [sic] encodes its path result so that a.b is not taken as two segments.

[som-snytt]

(Temporarily?) exclude a test from best effort neg, where the test file has a hyphen.

Under JDK 23, a bootstrap error at TypeApplications.typeParams where the exception handler

    catch {
      case ex: Throwable => handleRecursive("type parameters of", self.show, ex)
    }

must spin up a by-name for the self.show arg. Maybe it happens to be out of stack or something.

There is also a long-running test in that group, also under JDK 23, but vulpix doesn't report test names (is there a verbose option?). The kill -3 says

``` at dotty.tools.dotc.core.MatchReducer.recur$2(TypeComparer.scala:3921) at dotty.tools.dotc.core.MatchReducer.op$proxy90$1(TypeComparer.scala:3940) at dotty.tools.dotc.core.MatchReducer.matchCases(TypeComparer.scala:3940) at dotty.tools.dotc.core.Types$MatchType.reduced$$anonfun$1(Types.scala:5239) at dotty.tools.dotc.core.Types$MatchType$$Lambda/0x00007102ef654f80.apply(Unknown Source) at dotty.tools.dotc.core.TypeComparer.inSubComparer(TypeComparer.scala:3311) at dotty.tools.dotc.core.TypeComparer.reduceMatchWith(TypeComparer.scala:3322) at dotty.tools.dotc.core.TypeComparer$.reduceMatchWith(TypeComparer.scala:3533) at dotty.tools.dotc.core.Types$MatchType.reduced(Types.scala:5239) at dotty.tools.dotc.core.Types$Type.tryNormalize(Types.scala:1593) at dotty.tools.dotc.core.Types$Type.normalized(Types.scala:1587) at dotty.tools.dotc.core.Types$MatchType.reduced$$anonfun$1(Types.scala:5239) at dotty.tools.dotc.core.Types$MatchType$$Lambda/0x00007102ef654f80.apply(Unknown Source) at dotty.tools.dotc.core.TypeComparer.inSubComparer(TypeComparer.scala:3311) at dotty.tools.dotc.core.TypeComparer.reduceMatchWith(TypeComparer.scala:3322) at dotty.tools.dotc.core.TypeComparer$.reduceMatchWith(TypeComparer.scala:3533) at dotty.tools.dotc.core.Types$MatchType.reduced(Types.scala:5239) at dotty.tools.dotc.core.Types$Type.tryNormalize(Types.scala:1593) at dotty.tools.dotc.core.Types$AppliedType.tryNormalize(Types.scala:4709) at dotty.tools.dotc.core.TypeOps$.simplify(TypeOps.scala:152) at dotty.tools.dotc.core.Types$Type.simplified(Types.scala:2101) at dotty.tools.dotc.core.MatchReducer.recur$2(TypeComparer.scala:3921) at dotty.tools.dotc.core.MatchReducer.op$proxy90$1(TypeComparer.scala:3940) ```

As a branding note, it would have been great if betasty were spelled beasty.

[som-snytt]

The JDK 23 failure is negTestFromBestEffortTasty/neg/i9299, looking way down the exception trace, is not very enlightening.

Caused by: java.lang.BootstrapMethodError: java.lang.BootstrapMethodError: bootstrap method initialization exception
        at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62)
        at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:501)
        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:485)
        at java.base/java.util.concurrent.ForkJoinTask.getException(ForkJoinTask.java:555)
        ... 44 more

I guess it is stack.

java.lang.NoClassDefFoundError: Could not initialize class java.lang.StackTraceElement$HashedModules

The test is an erroneous match type, so maybe it is related to the long-running test; for some reason it passes JDK 17 not 23.

Exiting right away shows

OpenJDK 64-Bit Server VM warning: Potentially dangerous stack overflow in ReservedStackAccess annotated method jdk.internal.misc.InternalLock.lock()V [1]
EX class java.lang.StackOverflowError

They say don't try to recover from SOE but we don't believe them.

Maybe there is a JVM-specific dimension, besides default stack size or whatever.

[som-snytt]

If you propagate the SOE, you are SOL and vulpix hangs.

        at dotty.tools.dotc.core.TypeApplications$.typeParams$extension(TypeApplications.scala:196)
        at dotty.tools.dotc.core.TypeApplications$.typeParams$extension(TypeApplications.scala:210)
        at dotty.tools.dotc.core.TypeApplications$.typeParams$extension(TypeApplications.scala:196)
        at dotty.tools.dotc.core.TypeApplications$.typeParamSymbols$extension(TypeApplications.scala:238)
        at dotty.tools.dotc.typer.Typer.adaptType$1(Typer.scala:4851)
        at dotty.tools.dotc.typer.Typer.adapt1(Typer.scala:4982)
        at dotty.tools.dotc.typer.Typer.adapt(Typer.scala:4216)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3836)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:3841)
        at dotty.tools.dotc.typer.Typer.typedMatchTypeTree(Typer.scala:2730)
***
        at dotty.tools.dotc.Driver.process(Driver.scala:169)
        at dotty.tools.vulpix.ParallelTesting$Test.compile(ParallelTesting.scala:564)
        at dotty.tools.vulpix.ParallelTesting$CompilationLogic.compileTestSource$$anonfun$1(ParallelTesting.scala:252)
        at scala.util.Try$.apply(Try.scala:217)
        at dotty.tools.vulpix.ParallelTesting$CompilationLogic.dotty$tools$vulpix$ParallelTesting$CompilationLogic$$compileTestSource(ParallelTesting.scala:264)
        at dotty.tools.vulpix.ParallelTesting$$anon$3.checkTestSource$$anonfun$1(ParallelTesting.scala:295)
        at dotty.tools.vulpix.ParallelTesting$$anon$3.checkTestSource$$anonfun$adapted$1(ParallelTesting.scala:298)
        at scala.Function0.apply$mcV$sp(Function0.scala:42)
        at dotty.tools.vulpix.ParallelTesting$Test.tryCompile(ParallelTesting.scala:482)
        at dotty.tools.vulpix.ParallelTesting$$anon$3.checkTestSource(ParallelTesting.scala:298)
        at dotty.tools.vulpix.ParallelTesting$Test$LoggedRunnable.run(ParallelTesting.scala:378)
        at dotty.tools.vulpix.ParallelTesting$Test$LoggedRunnable.run$(ParallelTesting.scala:360)
        at dotty.tools.vulpix.ParallelTesting$$anon$3.run(ParallelTesting.scala:293)
        at java.base/java.util.concurrent.ForkJoinTask$AdaptedInterruptibleRunnable.compute(ForkJoinTask.java:1709)
        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:1460)
        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2036)
        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:189)
^C
[warn] Canceling execution...

I didn't expect that.