Make the test fail if compiled without -threaded
Test Plan: validate Reviewers: bgamari, austin, erikd Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3387
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Test Plan: validate Reviewers: bgamari, austin, erikd Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3387