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Ryan Scott authored
Trac #14646 happened because we forgot to parenthesize `forall` types to the left of an arrow. This simple patch fixes that. Test Plan: make test TEST=T14646 Reviewers: alanz, goldfire, bgamari Reviewed By: alanz Subscribers: rwbarton, thomie, carter GHC Trac Issues: #14646 Differential Revision: https://phabricator.haskell.org/D4298
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