[GHC] #7503: Bug with PolyKinds, type synonyms & GADTs

[GHC]

#7503: Bug with PolyKinds, type synonyms & GADTs
-------------------------------------+-------------------------------------
        Reporter:  Ashley Yakeley    |                Owner:  simonpj
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.6.1
  checker)                           |             Keywords:  GADTs,
      Resolution:                    |  TypeInType
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  GHC rejects       |  (amd64)
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14451            |  Differential Rev(s):
       Wiki Page:                    |
  https://ghc.haskell.org/trac/ghc/wiki/GhcKinds/KindInference|
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Comment (by Ryan Scott <ryan.gl.scott@…>):

 In [changeset:"aef5d82543bb642a65f63e1f05f245b9cddafd8c/ghc"
 aef5d825/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="aef5d82543bb642a65f63e1f05f245b9cddafd8c"
 Add test cases for #7503, #14451

 At some point between 8.4 and 8.6, two things were fixed:

 * The entirety of #14451.
 * One of the test cases in #7503. I've added this as T7503a. The
   other test case from that ticket still does /not/ work, so we'll
   have to add T7503b some other day.
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7503#comment:11>
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