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Ryan Scott authored
Previously, GHC would not warn whenever there was a class instance that didn't implement a class method whose name begins with an underscore. Fixes #12959. Test Plan: make test TEST=WarnMinimal Reviewers: austin, bgamari, simonpj Reviewed By: bgamari, simonpj Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2849 GHC Trac Issues: #12959
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