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niteria authored
varSetElems introduces unnecessary non-determinism and while I didn't estabilish experimentally that this matters here I'm convinced that it will, because I expect pattern synonyms to end up in interface files. Test Plan: ./validate Reviewers: austin, simonmar, bgamari, mpickering, simonpj Reviewed By: simonpj Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2206 GHC Trac Issues: #4012
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