Crash dealing with '@parser::members'

[david-29]

See the attachment.

I had just added an @parser::members { ... } section to my ANTLR grammar file.

[bjansen]

I can reproduce it:

java.lang.AssertionError: (15,15), text: @, language = Language: ANTLRv4
	at com.intellij.lang.folding.FoldingDescriptor.<init>(FoldingDescriptor.java:193)
	at com.intellij.lang.folding.FoldingDescriptor.<init>(FoldingDescriptor.java:117)
	at com.intellij.lang.folding.FoldingDescriptor.<init>(FoldingDescriptor.java:98)
	at com.intellij.lang.folding.FoldingDescriptor.<init>(FoldingDescriptor.java:83)
	at com.intellij.lang.folding.FoldingDescriptor.<init>(FoldingDescriptor.java:70)
	at org.antlr.intellij.plugin.folding.ANTLRv4FoldingBuilder.addActionFoldingDescriptors(ANTLRv4FoldingBuilder.java:130)
	at org.antlr.intellij.plugin.folding.ANTLRv4FoldingBuilder.buildLanguageFoldRegions(ANTLRv4FoldingBuilder.java:66)
	at com.intellij.lang.folding.CustomFoldingBuilder.buildFoldRegions(CustomFoldingBuilder.java:45)
	at com.intellij.lang.folding.LanguageFolding.buildFoldingDescriptorsNoPlaceholderCaching(LanguageFolding.java:90)
	at com.intellij.lang.folding.LanguageFolding.buildFoldingDescriptors(LanguageFolding.java:72)
	at com.intellij.codeInsight.folding.impl.FoldingUpdate.getFoldingsFor(FoldingUpdate.java:233)
	at com.intellij.codeInsight.folding.impl.FoldingUpdate.getFoldingsFor(FoldingUpdate.java:213)
	at com.intellij.codeInsight.folding.impl.FoldingUpdate.getUpdateResult(FoldingUpdate.java:84)
	at com.intellij.codeInsight.folding.impl.FoldingUpdate.lambda$updateFoldRegions$0(FoldingUpdate.java:73)
	at com.intellij.psi.impl.PsiCachedValueImpl.doCompute(PsiCachedValueImpl.java:54)
	at com.intellij.util.CachedValueBase.lambda$getValueWithLock$1(CachedValueBase.java:240)
	at com.intellij.openapi.util.RecursionManager$1.doPreventingRecursion(RecursionManager.java:113)
	at com.intellij.openapi.util.RecursionManager.doPreventingRecursion(RecursionManager.java:71)
	at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:241)
	at com.intellij.psi.impl.PsiCachedValueImpl.getValue(PsiCachedValueImpl.java:43)
	at com.intellij.util.CachedValuesManagerImpl.getCachedValueFromExHolder(CachedValuesManagerImpl.java:72)
	at com.intellij.util.CachedValuesManagerImpl.getCachedValue(CachedValuesManagerImpl.java:45)
	at com.intellij.codeInsight.folding.impl.FoldingUpdate.updateFoldRegions(FoldingUpdate.java:70)
	at com.intellij.codeInsight.folding.impl.CodeFoldingManagerImpl.updateFoldRegions(CodeFoldingManagerImpl.java:280)
	at com.intellij.codeInsight.folding.impl.CodeFoldingManagerImpl.updateFoldRegionsAsync(CodeFoldingManagerImpl.java:266)
	at com.intellij.codeInsight.daemon.impl.CodeFoldingPass.doCollectInformation(CodeFoldingPass.java:42)
	at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:55)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$null$1(PassExecutorService.java:429)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1106)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$2(PassExecutorService.java:422)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:591)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:537)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:59)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.doRun(PassExecutorService.java:421)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$run$0(PassExecutorService.java:397)
	at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:164)
	at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:204)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:395)
	at com.intellij.concurrency.JobLauncherImpl$VoidForkJoinTask$1.exec(JobLauncherImpl.java:161)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)