OK, it looks like just one test failed testIncrementalBlockingErrorRepeatAndUndo. This is a test case with a blocking error, probably something with exceptions is different on Windows (i.e. OSError vs IPCException).

Yep, we are trying to shutdown all workers when coordinator gets a blocker, but one of the workers is also crashed, we ignore this condition by catching OSError, but on Windows IPCException is raised. I think ideally we need to unify this, but for now I am simply catching both exceptions.

According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅