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Some operating systems (e.g. Darwin) have very poor file timestamp resolution. On these systems GHC often fails to notice that B.hs changes in this testsuite, leading to sporatic test failures. Add a sleep to ensure the change is noticed. Test Plan: Validate Reviewers: ezyang, austin Subscribers: mpickering, gracjan, thomie Differential Revision: https://phabricator.haskell.org/D2964
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