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Ryan Scott authored
The previous users' guide documentation was too implementation-oriented. This attempts to make it more accessible to those who aren't familiar with how `-XDeriveFunctor` and friends work (and more importantly, what will not work when using them). Fixes #10831. Reviewed By: austin Differential Revision: https://phabricator.haskell.org/D1293 GHC Trac Issues: #10831
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