For now this issue should be resolved, so we can remove from `mach-busted` (though it'll come up again in the future). Also since the description of the original problem was in the title, restating it here so it's not lost: The original failure happened because `mozregression` depends on `mozfile`, so when we install it into the build system virtualenv it pulls the latest version of `mozfile` from pypi and overwrites the in-tree version (which will be more recent).
Bug 1580625 Comment 10 Edit History
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For now this issue should be resolved, so we can remove from `mach-busted` (though it'll come up again in the future). Also since the description of the original problem was in the title, restating it here so it's not lost: The original failure happened because `mozregression` depends on `mozfile`, so when we install it into the build system virtualenv it pulls the latest version of `mozfile` from pypi and overwrites the in-tree version (which will be more recent).