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This fixes #12128. The bug was introduced in 1c9fd3f1. Test Plan: ./validate Reviewers: simonmar, austin, hvr, simonpj, bgamari Reviewed By: bgamari Subscribers: simonpj, thomie Differential Revision: https://phabricator.haskell.org/D2374 GHC Trac Issues: #12128
8de6e13f