binary in HP

[Mikhail Glushenkov]

Hi Mark,

> The first would create a really bad "cabal-hell" trap (which is really a version constraint hell, not sure why cabal takes the fall...).

I am not so sure about that. It's perfectly possible to have two
different versions of a library installed, and the solver usually does
the right thing in that case (in my experience). It's the absence of
support for having multiple instances of the same package version
installed that is causing trouble.

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