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David Feuer authored
It shouldn't be necessary to lock the `MVar` closure on `tryReadMVar`, since it just reads one field of the structure and doesn't make any modifications. So let's not. Reviewers: bgamari, erikd, simonmar, fryguybob, osa1 Reviewed By: osa1 Subscribers: osa1, rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4905
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