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It uses `eltsUFM` so it can introduce nondeterminism, but it isn't used so we can delete it. Test Plan: it builds Reviewers: simonpj, goldfire, simonmar, austin, bgamari Reviewed By: austin, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2161 GHC Trac Issues: #4012
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