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David Feuer authored
Instead of pulling a token and looking for `'('` or `')'`, just look for the character itself. This prevents us from lexing every single item twice, once to see if it's a left parenthesis and once to actually parse it. Partially fixes #12665 Test Plan: Validate Reviewers: austin, bgamari, hvr Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2623 GHC Trac Issues: #12665
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