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Ningning Xie authored
Summary: This patch fixes #15805, where we found that `TcType.anyRewritableTyVar` has one wrong case. Besides the fix, it also: - removed some unnecessary `ASSERT2(tcIsTcTyVar...)` in `TcType`, as now we have `tcIsTcTyVar = isTyVar`. - fixed some comments Test Plan: ./validate Reviewers: goldfire, simonpj, bgamari Reviewed By: simonpj Subscribers: rwbarton, carter GHC Trac Issues: #15805 Differential Revision: https://phabricator.haskell.org/D5263 (cherry picked from commit a7f64c6c)
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