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Reviewers: austin, mpickering

Reviewed By: mpickering

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2689

sdiehl/ghc,sdiehl/ghc,olsner/ghc,shlevy/ghc,olsner/ghc,olsner/ghc,shlevy/ghc,ezyang/ghc,mettekou/ghc,olsner/ghc,sdiehl/ghc,olsner/ghc,mettekou/ghc,shlevy/ghc,mettekou/ghc,shlevy/ghc,mettekou/ghc,mettekou/ghc,sdiehl/ghc,olsner/ghc,ezyang/ghc,ezyang/ghc,mettekou/ghc,sdiehl/ghc,ezyang/ghc,sdiehl/ghc,ezyang/ghc,ezyang/ghc,ezyang/ghc,shlevy/ghc,shlevy/ghc,olsner/ghc,shlevy/ghc,sdiehl/ghc,mettekou/ghc