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Ryan Scott authored
Previously, we were unconditionally pretty-printing all type variable binders when pretty-printing closed type families (e.g., in the output of `:info` in GHCi). This threw me for a loop, so let's guard this behind the `-fprint-explicit-foralls` flag. Test Plan: make test TEST=T13420 Reviewers: goldfire, austin, bgamari Reviewed By: bgamari Subscribers: rwbarton, thomie GHC Trac Issues: #13420 Differential Revision: https://phabricator.haskell.org/D3497
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