`stack install` is meant to install packages that result in a executable program, not for libraries.
It was supposedly successfully installed but when I try to import it stack says it couldn't find it ('Could not find module ‘Data.MultiSet’). I've tried reading
haskellstack.org's documentation but I've not been able to find a solution.
You need to specify `multiset` as a dependency in your `package.yaml` of your project.
Well, thanks in advance for your help
Mike
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