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Hydra fails with a `DirectoryError: [Errno 21] Is a directory: '/build/source/fsspec/tests/__pycache__'`. I suspect that both drvs `python37Packages.fsspec` and `python38Packages.fsspec` share the same folder `'/build/source/fsspec/tests/__pycache__'` which leads to problems. To fix it I just let each drvs run in a tmp directory using `pytestFlagsArray = [ "--rootdir=$(mktemp -d)" ];`.