Niklas Hambüchen <mail <at>> writes:

> Reading the other thread (Adding Applicative/Functor instances to all
> Monads in GHC) I was wondering if there was infrastructure for testing
> what effect making the often-discussed Functor/Monad change would have:
> How many packages on hackage would break etc.

Some patches for GHC/base are attached to They're a couple of years
old, so they may not apply cleanly, but they might help you in assessing the
impact of such a change.

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