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As mentioned in #4426 these warnings are now errors since the Great Wildcards Refactor of 2015 (1e041b73). I've opened #11221 to ensure we remove the last traces of the option in 8.2. Test Plan: validate Reviewers: austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1615 GHC Trac Issues: #4426
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