[GHC] #12442: Pure unifier usually doesn't need to unify kinds

[GHC]

#12442: Pure unifier usually doesn't need to unify kinds
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        Reporter:  goldfire          |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  dependent/should_compile/T12442
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2433
       Wiki Page:                    |
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Comment (by Richard Eisenberg <rae@…>):

 In [changeset:"34834234fff4a9dd0408d3b29e001cd132665327/ghc"
 34834234/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="34834234fff4a9dd0408d3b29e001cd132665327"
 Comments in Unify, fixing #12442

 [ci skip]
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12442#comment:8>
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