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Rare AssertionError in AnalyzerTest #5180

@sjrd

Description

@sjrd

I just ran into this error while locally running linker2_12/test:

[error] Test org.scalajs.linker.AnalyzerTest.bigCycleInInheritanceChain failed: java.util.concurrent.ExecutionException: Boxed Error, took 0.007 sec
[error]     at scala.concurrent.impl.Promise$.resolver(Promise.scala:97)
[error]     at scala.concurrent.impl.Promise$.scala$concurrent$impl$Promise$$resolveTry(Promise.scala:89)
[error]     at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:294)
[error]     at scala.concurrent.Promise.complete(Promise.scala:53)
[error]     at scala.concurrent.Promise.complete$(Promise.scala:52)
[error]     at scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:197)
[error]     at scala.concurrent.impl.Promise.$anonfun$transform$1(Promise.scala:42)
[error]     at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:74)
[error]     at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1423)
[error]     at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
[error]     at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
[error]     at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
[error]     at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
[error]     at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
[error] Caused by: java.lang.AssertionError: assertion failed: unresolved root: ClassName<D>
[error]     at scala.Predef$.assert(Predef.scala:223)
[error]     at org.scalajs.linker.analyzer.AnalyzerRun.$anonfun$lookupOrSynthesizeClassCommon$1(Analyzer.scala:351)
[error]     at org.scalajs.linker.analyzer.AnalyzerRun.$anonfun$lookupOrSynthesizeClassCommon$1$adapted(Analyzer.scala:345)
[error]     at scala.util.Success.$anonfun$map$1(Try.scala:255)
[error]     at scala.util.Success.map(Try.scala:213)
[error]     at scala.concurrent.Future.$anonfun$map$1(Future.scala:292)
[error]     ... 8 more
[error] Failed: Total 163, Failed 1, Errors 0, Passed 162
[error] Failed tests:
[error]         org.scalajs.linker.AnalyzerTest
[error] (linker2_12 / Test / test) sbt.TestsFailedException: Tests unsuccessful

I could not reproduce it, so I'm documenting it for future investigation.

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