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Joachim Breitner authored
Summary: to allow GHC to maybe remove the Maybe. See the code comment for more commentary. This fixes #9369. Test Plan: see what happens on ghcspeed (once it is merged) Reviewers: austin Reviewed By: austin Subscribers: simonmar, ezyang, carter Differential Revision: https://phabricator.haskell.org/D198 GHC Trac Issues: #9369
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