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This was previously a panic and caused #13871. I believe just saying these types simply aren't Typeable should be correct. Test Plan: Validate, check `T13871` Reviewers: goldfire, austin Subscribers: rwbarton, thomie, RyanGlScott GHC Trac Issues: #13871 Differential Revision: https://phabricator.haskell.org/D3672
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