Re: [GHC] #15591: Inconsistent kind variable binder visibility between associated and non-associated type families

#15591: Inconsistent kind variable binder visibility between associated and non- associated type families -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: patch Priority: normal | Milestone: 8.8.1 Component: Compiler | Version: 8.5 Resolution: | Keywords: | TypeApplications, TypeFamilies Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #15592 | Differential Rev(s): Phab:D5159 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ryan Scott ): In [changeset:"a57fa24746421c0e13d0c09b72cbabea3622779f/ghc" a57fa247/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="a57fa24746421c0e13d0c09b72cbabea3622779f" Quantify class variables first in associated families' kinds 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 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15591#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler