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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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