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Chandan Singh authored
Currently, running any setuptools commands using `setup.py` generates a warning like so: warning: manifest_maker: MANIFEST.in, line 21: unknown action 'dev-requirements.txt' The syntax is invalid and got accidentally introduced in !637 but it's a shame that this is not a warning and no obvious way to make it an error if there are invalid things in MANIFEST.in file. --- This is a backport of !704.
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