REPL: Tab Completion tests throw exceptions for java.lang.WeakPairMap

[bracevac]

Compiler version

3.9.0-RC1-bin-SNAPSHOT

Minimized code

Running sbt scala3-repl/test, we get these errors frequently (and exclusively) during tab completion tests:

java.util.NoSuchElementException: key not found: K2

followed by

java.io.IOException:   class file /modules/java.base/java/lang/WeakPairMap$Pair$Weak$1.class is broken (version 61.0),
  please check the JDK compatibility of your Scala version (3.9.0-RC1-bin-SNAPSHOT)

Full stacktrace:

Details

```scala [info] Test dotty.tools.repl.TabcompleteTests.i16551 typer phase for implicits started java.util.NoSuchElementException: key not found: K2 | => sat scala.collection.immutable.Map$EmptyMap$.apply(Map.scala:252) at scala.collection.immutable.Map$EmptyMap$.apply(Map.scala:252) at dotty.tools.dotc.core.classfile.ClassfileParser.sig2type$1(ClassfileParser.scala:692) at dotty.tools.dotc.core.classfile.ClassfileParser.processTypeArgs$1(ClassfileParser.scala:620) at dotty.tools.dotc.core.classfile.ClassfileParser.sig2type$1(ClassfileParser.scala:635) at dotty.tools.dotc.core.classfile.ClassfileParser.dotty$tools$dotc$core$classfile$ClassfileParser$$sigToType(ClassfileParser.scala:759) at dotty.tools.dotc.core.classfile.ClassfileParser$AttributeCompleter.complete(ClassfileParser.scala:903) at dotty.tools.dotc.core.classfile.ClassfileParser.parseClass(ClassfileParser.scala:413) at dotty.tools.dotc.core.classfile.ClassfileParser.$anonfun$1(ClassfileParser.scala:300) at dotty.tools.dotc.core.classfile.ClassfileParser.run(ClassfileParser.scala:295) at dotty.tools.dotc.core.ClassfileLoader.doComplete(SymbolLoaders.scala:504) at dotty.tools.dotc.core.SymbolLoader$$anon$1.doComplete(SymbolLoaders.scala:411) at dotty.tools.dotc.core.SymbolLoader.complete(SymbolLoaders.scala:435) at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:176) 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$SymDenotation.ensureCompleted(SymDenotations.scala:404) at dotty.tools.dotc.core.SymDenotations$SymDenotation.flags(SymDenotations.scala:66) at dotty.tools.dotc.core.SymDenotations$ModuleCompleter.complete(SymDenotations.scala:2875) at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:176) 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$SymDenotation.ensureCompleted(SymDenotations.scala:404) at dotty.tools.dotc.core.SymDenotations$SymDenotation.flags(SymDenotations.scala:66) at dotty.tools.dotc.core.SymDenotations$SymDenotation.is(SymDenotations.scala:112) at dotty.tools.dotc.interactive.Completion$.isValidCompletionSymbol(Completion.scala:368) at dotty.tools.dotc.interactive.Completion$Completer.dotty$tools$dotc$interactive$Completion$Completer$$include(Completion.scala:689) at dotty.tools.dotc.interactive.Completion$Completer$$anon$5.applyOrElse(Completion.scala:718) at dotty.tools.dotc.interactive.Completion$Completer$$anon$5.applyOrElse(Completion.scala:717) at scala.collection.immutable.List.collect(List.scala:273) at scala.collection.immutable.List.collect(List.scala:258) at dotty.tools.dotc.interactive.Completion$Completer.accessibleMembers(Completion.scala:719) at dotty.tools.dotc.interactive.Completion$Completer.importedCompletions(Completion.scala:551) at dotty.tools.dotc.interactive.Completion$Completer.scopeCompletions$lzyINIT1$$anonfun$1(Completion.scala:429) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10) at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:626) at dotty.tools.dotc.core.Contexts$Context$$anon$2.foreach(Contexts.scala:136) at dotty.tools.dotc.interactive.Completion$Completer.scopeCompletions$lzyINIT1(Completion.scala:427) at dotty.tools.dotc.interactive.Completion$Completer.scopeCompletions(Completion.scala:417) at dotty.tools.dotc.interactive.Completion$Completer.extensionCompletions(Completion.scala:653) at dotty.tools.dotc.interactive.Completion$Completer.selectionCompletions(Completion.scala:510) at dotty.tools.dotc.interactive.Completion$.computeCompletions(Completion.scala:269) at dotty.tools.dotc.interactive.Completion$.rawCompletions(Completion.scala:91) at dotty.tools.dotc.interactive.Completion$.completions(Completion.scala:73) at dotty.tools.repl.ReplDriver.completions$$anonfun$1(ReplDriver.scala:357) at scala.util.Either.map(Either.scala:466) at dotty.tools.repl.ReplDriver.completions(ReplDriver.scala:350) at dotty.tools.repl.ReplTest.tabComplete(ReplTest.scala:48) at dotty.tools.repl.TabcompleteTests.i16551$u0020typer$u0020phase$u0020for$u0020implicits$$anonfun$1(TabcompleteTests.scala:242) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10) at dotty.tools.repl.ReplTest.initially(ReplTest.scala:42) at dotty.tools.repl.TabcompleteTests.i16551$u0020typer$u0020phase$u0020for$u0020implicits(TabcompleteTests.scala:241) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63) at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329) at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.ParentRunner.run(ParentRunner.java:413) at org.junit.runners.Suite.runChild(Suite.java:128) at org.junit.runners.Suite.runChild(Suite.java:27) at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329) at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.ParentRunner.run(ParentRunner.java:413) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at org.junit.runner.JUnitCore.run(JUnitCore.java:115) at com.novocode.junit.JUnitTask.execute(JUnitTask.java:64) at sbt.ForkMain$Run.lambda$runTest$1(ForkMain.java:414) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:842) java.io.IOException: class file /modules/java.base/java/lang/WeakPairMap$Pair$Weak$1.class is broken (version 61.0), please check the JDK compatibility of your Scala version (3.9.0-RC1-bin-SNAPSHOT), reading aborted with class java.util.NoSuchElementException: key not found: K2 at dotty.tools.dotc.core.classfile.ClassfileParser.run(ClassfileParser.scala:313) at dotty.tools.dotc.core.ClassfileLoader.doComplete(SymbolLoaders.scala:504) at dotty.tools.dotc.core.SymbolLoader$$anon$1.doComplete(SymbolLoaders.scala:411) at dotty.tools.dotc.core.SymbolLoader.complete(SymbolLoaders.scala:435) at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:176) 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$SymDenotation.ensureCompleted(SymDenotations.scala:404) at dotty.tools.dotc.core.SymDenotations$SymDenotation.flags(SymDenotations.scala:66) at dotty.tools.dotc.core.SymDenotations$ModuleCompleter.complete(SymDenotations.scala:2875) at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:176) 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$SymDenotation.ensureCompleted(SymDenotations.scala:404) at dotty.tools.dotc.core.SymDenotations$SymDenotation.flags(SymDenotations.scala:66) at dotty.tools.dotc.core.SymDenotations$SymDenotation.is(SymDenotations.scala:112) at dotty.tools.dotc.interactive.Completion$.isValidCompletionSymbol(Completion.scala:368) at dotty.tools.dotc.interactive.Completion$Completer.dotty$tools$dotc$interactive$Completion$Completer$$include(Completion.scala:689) at dotty.tools.dotc.interactive.Completion$Completer$$anon$5.applyOrElse(Completion.scala:718) at dotty.tools.dotc.interactive.Completion$Completer$$anon$5.applyOrElse(Completion.scala:717) at scala.collection.immutable.List.collect(List.scala:273) at scala.collection.immutable.List.collect(List.scala:258) at dotty.tools.dotc.interactive.Completion$Completer.accessibleMembers(Completion.scala:719) at dotty.tools.dotc.interactive.Completion$Completer.importedCompletions(Completion.scala:551) at dotty.tools.dotc.interactive.Completion$Completer.scopeCompletions$lzyINIT1$$anonfun$1(Completion.scala:429) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10) at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:626) at dotty.tools.dotc.core.Contexts$Context$$anon$2.foreach(Contexts.scala:136) at dotty.tools.dotc.interactive.Completion$Completer.scopeCompletions$lzyINIT1(Completion.scala:427) at dotty.tools.dotc.interactive.Completion$Completer.scopeCompletions(Completion.scala:417) at dotty.tools.dotc.interactive.Completion$Completer.extensionCompletions(Completion.scala:653) at dotty.tools.dotc.interactive.Completion$Completer.selectionCompletions(Completion.scala:510) at dotty.tools.dotc.interactive.Completion$.computeCompletions(Completion.scala:269) at dotty.tools.dotc.interactive.Completion$.rawCompletions(Completion.scala:91) at dotty.tools.dotc.interactive.Completion$.completions(Completion.scala:73) at dotty.tools.repl.ReplDriver.completions$$anonfun$1(ReplDriver.scala:357) at scala.util.Either.map(Either.scala:466) at dotty.tools.repl.ReplDriver.completions(ReplDriver.scala:350) at dotty.tools.repl.ReplTest.tabComplete(ReplTest.scala:48) at dotty.tools.repl.TabcompleteTests.i16551$u0020typer$u0020phase$u0020for$u0020implicits$$anonfun$1(TabcompleteTests.scala:242) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15) at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10) at dotty.tools.repl.ReplTest.initially(ReplTest.scala:42) at dotty.tools.repl.TabcompleteTests.i16551$u0020typer$u0020phase$u0020for$u0020implicits(TabcompleteTests.scala:241) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63) at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329) at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.ParentRunner.run(ParentRunner.java:413) at org.junit.runners.Suite.runChild(Suite.java:128) at org.junit.runners.Suite.runChild(Suite.java:27) at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329) at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.ParentRunner.run(ParentRunner.java:413) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at org.junit.runner.JUnitCore.run(JUnitCore.java:115) at com.novocode.junit.JUnitTask.execute(JUnitTask.java:64) at sbt.ForkMain$Run.lambda$runTest$1(ForkMain.java:414) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:842) ```

I'm on a mac with JDK 17:

> java -version
java version "17.0.12" 2024-07-16 LTS
Java(TM) SE Runtime Environment (build 17.0.12+8-LTS-286)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.12+8-LTS-286, mixed mode, sharing)