[GHC] #9200: Milner-Mycroft failure at the kind level

[GHC]

#9200: Milner-Mycroft failure at the kind level
-------------------------------------+-------------------------------------
              Reporter:  ekmett      |            Owner:  goldfire
                  Type:  bug         |           Status:  closed
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.8.2
  (Type checker)                     |         Keywords:
            Resolution:  fixed       |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  GHC         |  Related Tickets:  #9427
  rejects valid program              |
             Test Case:              |
  polykinds/T9200 polykinds/T9200b   |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by goldfire):

 * status:  new => closed
 * testcase:   => polykinds/T9200 polykinds/T9200b
 * resolution:   => fixed
 * related:   => #9427
 * milestone:   => 7.10.1


Comment:

 The above patches implement much of what was discussed here. They do
 ''not'' implement the "possible variation" part from the wiki page, as I
 ran out of time and the plumbing became a little challenging. See ticket
 #9427 to track the implementation of that piece.

 This is a user-facing, breaking change (in obscure circumstances) and
 should not be merged for 7.8.4.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9200#comment:45>
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