[Distutils] unparseable sdist filenames

[Marcus Smith]

>
>
> > how will context decide between the version being "dev" or "xdist-dev"?
>
> By whether you asked to install "pytest-xdist" or "pytest", and by
> whether "dev" or "xdist-dev" match your version requirements.  In
> practice this tends to only be a problem if you are:
>
> 1. Installing the two packages during the same run, and
> 2. Aren't using version specifiers.
>

#2 is a big deal.  the pip issue (#1192) that motivated this was a #2.
local find-links with non-versioned requirements.
so, suppose you have "pytest-xdist-dev.tar.gz" in a find-links location.
whether you're trying to install "pytest" or "pytest-xdist" doesn't help
the installer determine how to parse that archive.
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