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Richard Eisenberg authored
Previously, GHC checked for bad levity polymorphism to the left of all arrows in data constructors. This was wrong, as reported in #12911 (where an example is also shown). The solution is to check each individual argument for bad levity polymorphism. Thus the check has been moved from TcValidity to TcTyClsDecls. A similar situation exists with pattern synonyms, also fixed here. This patch also nabs #12819 while I was in town. Test cases: typecheck/should_compile/T12911, patsyn/should_fail/T12819 Test Plan: ./validate Reviewers: simonpj, austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2783 GHC Trac Issues: #12819, #12911
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