[GHC] #15568: Kind variables in type family aren't quantified in toposorted order

[GHC]

#15568: Kind variables in type family aren't quantified in toposorted order
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        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:                    |  Differential Rev(s):  Phab:D5108
       Wiki Page:                    |
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Comment (by Krzysztof Gogolewski <krz.gogolewski@…>):

 In [changeset:"102284e72f8d29599803aa72ccec180db28e72c8/ghc" 102284e/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="102284e72f8d29599803aa72ccec180db28e72c8"
 Rename kind vars in left-to-right order in bindHsQTyVars

 Summary:
 When renaming kind variables in an `LHsQTyVars`, we were
 erroneously putting all of the kind variables in the binders
 //after// the kind variables in the body, resulting in #15568. The
 fix is simple: just swap the order of these two around.

 Test Plan: make test TEST=T15568

 Reviewers: simonpj, bgamari, goldfire

 Reviewed By: goldfire

 Subscribers: goldfire, rwbarton, carter

 GHC Trac Issues: #15568

 Differential Revision: https://phabricator.haskell.org/D5108
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15568#comment:3>
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