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The original TH failure observed by the ticket, namely that Template Haskell quotes of data instance GADTs are broken, is not observable anymore in HEAD. I therefore just added the corresponding regression test. Test Plan: ./validate Reviewers: goldfire, austin, thomie, jstolarek, bgamari Reviewed By: bgamari Differential Revision: https://phabricator.haskell.org/D1978 GHC Trac Issues: #11145
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