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Glasgow Haskell Compiler / GHC
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David Feuer
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The fundamental problem with `type UniqSet = UniqFM` is that `UniqSet` has a key invariant `UniqFM` does not. For example, `fmap` over `UniqSet` will generally produce nonsense. * Upgrade `UniqSet` from a type synonym to a newtype. * Remove unused and shady `extendVarSet_C` and `addOneToUniqSet_C`. * Use cached unique in `tyConsOfType` by replacing `unitNameEnv (tyConName tc) tc` with `unitUniqSet tc`. Reviewers: austin, hvr, goldfire, simonmar, niteria, bgamari Reviewed By: niteria Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D3146
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