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This fixes #12441, where definitions in a Haskell module and its boot file which differed only in their quantifiers produced a confusing error message. Here we teach GHC to always show quantifiers for these errors. Reviewers: goldfire, simonmar, erikd, austin, hvr, bgamari Reviewed By: bgamari Subscribers: snowleopard, simonpj, mpickering, thomie Differential Revision: https://phabricator.haskell.org/D2734 GHC Trac Issues: #12441
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