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As noted in #12837, these classes are special and the user should not be able to define their own instances. Test Plan: Validate Reviewers: adamgundry, goldfire, mpickering, austin, bgamari Reviewed By: goldfire, mpickering Subscribers: goldfire, mpickering, thomie Differential Revision: https://phabricator.haskell.org/D2898 GHC Trac Issues: #12837
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