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niteria authored
The pre-condition on `mkTopTCvSubst` turned out to be wrong and not satisfied by any of the callers. I've fixed it, so that it constructs the in_scope set from the range of the substitution. `mkTopTCvSubst` was also unnecessarily general it is never called with `CoVars`, so I changed the type signature and added an assertion. Test Plan: ./validate --slow Reviewers: goldfire, simonpj, bgamari, austin Reviewed By: simonpj Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1801 GHC Trac Issues: #11371
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