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Ryan Scott authored
Summary: Commit 0257dacf (`Refactor bindHsQTyVars and friends`) ended up fixing #14209. Let's add a regression test so that it stays fixed. Test Plan: make test TEST=T14209 Reviewers: austin, bgamari Subscribers: rwbarton, thomie GHC Trac Issues: #14209 Differential Revision: https://phabricator.haskell.org/D3936
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