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Ryan Scott authored
Summary: Previously, if `reifyInstances` failed to discover a `Name` during renaming, it would blindy charge into typechecking, at which point GHC would become very confused at the absence of that `Name` and throw an internal error. A simple workaround is to fail eagerly after renaming errors. Test Plan: make test TEST=T13837 Reviewers: goldfire, austin, bgamari, simonpj Reviewed By: simonpj Subscribers: simonpj, rwbarton, thomie GHC Trac Issues: #13837 Differential Revision: https://phabricator.haskell.org/D3793
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