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Ryan Scott authored
Summary: This amounts to using `exactTyCoVarsOfType` instead of `tyCoVarsOfType` in the right place. I also fixed a similar issue for `-XDatatypeContexts` while I was in town (but couldn't be bothered to add a test for it). Test Plan: make test TEST=T13813 Reviewers: austin, bgamari, simonpj Reviewed By: simonpj Subscribers: simonpj, rwbarton, thomie GHC Trac Issues: #13813 Differential Revision: https://phabricator.haskell.org/D3635
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