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Ryan Scott authored
Summary: Previously, `kcLHsQTyVars` would always quantify class-bound variables invisibly in the kinds of associated types, resulting in #15591. We counteract this by explicitly passing the class-bound variables to `kcLHsQTyVars` and quantifying over the ones that are mentioned in the associated type such that (1) they are specified, and (2) they come before other kind variables. See `Note [Kind variable ordering for associated types]`. Test Plan: make test TEST=T15591 Reviewers: goldfire, simonpj, bgamari Reviewed By: simonpj Subscribers: rwbarton, carter GHC Trac Issues: #15591 Differential Revision: https://phabricator.haskell.org/D5159
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