FileAlreadyExistsException when compiling bridges #2826
Description
This popped up in out tests and might be a reason for making things flaky on our side, however I am not entirely sure.
This does look like a bug though, but might happen very rarely when compiling bridges get invoked twice via BSP (that's my guess)
2023.10.02 09:23:24 INFO time: indexed workspace in 3.53s
2023.10.02 09:23:26 INFO BSP server: Compiling compiler interface...
2023.10.02 09:23:37 INFO BSP server: [info] compiling 1 Scala source to /home/runner/work/metals/metals/tests/slow/target/e2e/mill-server-lenses/run-mill-lens/out/MillMinimal/compile.dest/classes ...
2023.10.02 09:23:39 INFO BSP server: [info] done compiling
2023.10.02 09:23:39 INFO BSP server: [info] compiling 1 Scala source to /home/runner/work/metals/metals/tests/slow/target/e2e/mill-server-lenses/run-mill-lens/out/MillMinimal/test/compile.dest/classes ...
2023.10.02 09:23:39 INFO BSP server: [info] done compiling
2023.10.02 09:23:40 INFO BSP server: Compiling compiler interface...
2023.10.02 09:23:50 INFO compiling target millminimal
2023.10.02 09:23:50 INFO BSP server: Caused by: java.lang.Exception: Failure during task evaluation: MillMinimal.compile java.nio.file.FileAlreadyExistsException: /home/runner/work/metals/metals/tests/slow/target/e2e/mill-server-lenses/run-mill-lens/out/mill/scalalib/ZincWorkerModule/worker.dest/zinc-1.9.5/2.13.12/compiled/DONE
2023.10.02 09:23:50 INFO BSP server: java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:94)
2023.10.02 09:23:50 INFO BSP server: java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
2023.10.02 09:23:50 INFO BSP server: java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
2023.10.02 09:23:50 INFO BSP server: java.base/sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:218)
2023.10.02 09:23:50 INFO BSP server: java.base/java.nio.file.Files.newByteChannel(Files.java:380)
2023.10.02 09:23:50 INFO BSP server: os.write$.write(ReadWriteOps.scala:64)
2023.10.02 09:23:50 INFO BSP server: os.write$.apply(ReadWriteOps.scala:77)
2023.10.02 09:23:50 INFO BSP server: mill.scalalib.worker.ZincWorkerImpl.compileBridgeIfNeeded(ZincWorkerImpl.scala:268)
2023.10.02 09:23:50 INFO BSP server: mill.scalalib.worker.ZincWorkerImpl.withCompilers(ZincWorkerImpl.scala:387)
2023.10.02 09:23:50 INFO BSP server: mill.scalalib.worker.ZincWorkerImpl.compileMixed(ZincWorkerImpl.scala:331)
2023.10.02 09:23:50 INFO BSP server: mill.scalalib.ScalaModule.$anonfun$compile$2(ScalaModule.scala:212)
2023.10.02 09:23:50 INFO BSP server: mill.define.Task$TraverseCtx.evaluate(Task.scala:71)
2023.10.02 09:23:50 INFO BSP server: at mill.eval.Evaluator.$anonfun$evalOrThrow$default$1$1(Evaluator.scala:42)
2023.10.02 09:23:50 INFO BSP server: at mill.eval.EvaluatorImpl$EvalOrThrow.apply(EvaluatorImpl.scala:66)
2023.10.02 09:23:50 INFO BSP server: at mill.bsp.worker.MillBuildServer.$anonfun$completableTasks$5(MillBuildServer.scala:648)
2023.10.02 09:23:50 INFO BSP server: at scala.collection.StrictOptimizedIterableOps.map(StrictOptimizedIterableOps.scala:100)
2023.10.02 09:23:50 INFO BSP server: at scala.collection.StrictOptimizedIterableOps.map$(StrictOptimizedIterableOps.scala:87)
2023.10.02 09:23:50 INFO BSP server: at scala.collection.immutable.Map$Map3.map(Map.scala:389)
2023.10.02 09:23:50 INFO BSP server: at mill.bsp.worker.MillBuildServer.$anonfun$completableTasks$1(MillBuildServer.scala:647)
2023.10.02 09:23:50 INFO BSP server: at mill.bsp.worker.MillBuildServer.$anonfun$completable$1(MillBuildServer.scala:684)
2023.10.02 09:23:50 INFO BSP server: ... 8 more
2023.10.02 09:23:50 INFO BSP server: