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  • David Feuer's avatar
    Derive <$ · 2219c8cd
    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
    2219c8cd