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Herbert Valerio Riedel authored
This adds the module `Data.Bifunctor` providing the `Bifunctor(bimap,first,second)` class and a couple of instances This module and the class were previously exported by the `bifunctors` package. In contrast to the original module all `INLINE` pragmas have been removed. Reviewed By: ekmett, austin, dolio Differential Revision: https://phabricator.haskell.org/D336
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