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Ryan Scott authored
Allows users to explicitly request which approach to `deriving` to use via keywords, e.g., ``` newtype Foo = Foo Bar deriving Eq deriving stock Ord deriving newtype Show ``` Fixes #10598. Updates haddock submodule. Test Plan: ./validate Reviewers: hvr, kosmikus, goldfire, alanz, bgamari, simonpj, austin, erikd, simonmar Reviewed By: alanz, bgamari, simonpj Subscribers: thomie, mpickering, oerjan Differential Revision: https://phabricator.haskell.org/D2280 GHC Trac Issues: #10598
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