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Ryan Scott authored
Summary: Although the code from #12087 isn't accepted by GHC, we can at least do a better job of letting users know what the problem is, and how to fix it. Test Plan: make test TEST=T12087 Reviewers: goldfire, austin, bgamari Reviewed By: goldfire Subscribers: rwbarton, thomie GHC Trac Issues: #12087 Differential Revision: https://phabricator.haskell.org/D3851
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