• David Feuer's avatar
    Add liftA2 to Applicative class · a2f39da0
    David Feuer authored
    * Make `liftA2` a method of `Applicative`.
    * Add explicit `liftA2` definitions to instances in `base`.
    * Add explicit invocations in `base`.
    Reviewers: ekmett, bgamari, RyanGlScott, austin, hvr
    Reviewed By: RyanGlScott
    Subscribers: ekmett, RyanGlScott, rwbarton, thomie
    Differential Revision: https://phabricator.haskell.org/D3031
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