WIP: Move complement to Complement type class

Related to recent libraries@ discussion

https://mail.haskell.org/pipermail/libraries/2019-December/030132.html

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• d7b8afe7 - Move complement into own class

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• d7b8afe7...5a4b8d0c - 24 commits from branch ghc:master
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changed title from Move complement to FiniteBits to Move complement to Complement type class

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added core libraries label

This needs input from @core-libraries.

marked as a Work In Progress

I am weakly +1 on this. We need to estimate impact. At least in this case, handling the breakage is pretty straightforward. I can think of several of my own/@andrewthad's libraries that will be affected. Can @core-libraries weigh in?

closed