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Ryan Scott authored
Summary: A simple oversight in the pretty-printer lead to a special case for `() :: Constraint` not being parenthesized correctly when used in an argument position. Easily fixed with a `maybeParen`. Test Plan: make test TEST=T14796 Reviewers: alanz, goldfire, bgamari, simonpj Reviewed By: bgamari, simonpj Subscribers: simonpj, rwbarton, thomie, carter GHC Trac Issues: #14796 Differential Revision: https://phabricator.haskell.org/D4408
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