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Previous representation of GADTs in TH was not expressive enough to express possible GADT return types. See #11341 Test Plan: ./validate Reviewers: goldfire, austin, bgamari Subscribers: thomie, RyanGlScott Differential Revision: https://phabricator.haskell.org/D1738 GHC Trac Issues: #11341 (cherry picked from commit cac0795a)
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