[Distutils] name of the dependency problem

[Marcus Smith]

> level 0 A
>   A level 1  1.4<= C
>
>
> level 0 B
>   B level 1  1.6<= C <1.7
>
> pip manages to download version 1.8 of C(Django) using A's requirement,
> but never even warns us that the B requirement of C was violated. Surely
> even in the absence of a resolution pip could raise a warning at the end.
>


agreed on the warning, but there is a documented workaround for this, that
is to put the desired constraint for C at level 0 (i.e. in the install args
or in your requirements file)

see case #2 here
https://pip.pypa.io/en/latest/user_guide.html#requirements-files
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