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David Feuer authored
Using the default definition of `<$` for derived `Functor` instance is very bad for recursive data types. Derive the definition instead. Fixes #13218 Reviewers: austin, bgamari, RyanGlScott Reviewed By: RyanGlScott Subscribers: RyanGlScott, thomie Differential Revision: https://phabricator.haskell.org/D3072
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