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Ryan Scott authored
Summary: `pprParendType` was missing an explicit case for `EqualityT`, which caused it to fall through to a catch-all case that invokes `ppr`. But `ppr` itself does not have a case for a partial application of `EqualityT`, so //it// falls back to `pprParendType`, resulting in an infinite loop! The fix is simple: add a case for `EqualityT` in `pprParendType`. While I was in the neighborhood, I removed the catch-call case in `pprParendType` to make this sort of mistake less likely to happen in the future. Test Plan: make test TEST=T15985 Reviewers: bgamari, monoidal, simonpj Reviewed By: monoidal, simonpj Subscribers: rwbarton, carter GHC Trac Issues: #15985 Differential Revision: https://phabricator.haskell.org/D5403
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