[GHC] #5777: core lint error with arrow notation and GADTs

[GHC]

#5777: core lint error with arrow notation and GADTs
-------------------------------------+-------------------------------------
              Reporter:  benmos      |            Owner:  ross
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.4.2
  (Type checker)                     |         Keywords:  arrows, GADTs
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  Compile-    |  Related Tickets:
  time crash                         |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * os:  MacOS X => Unknown/Multiple
 * component:  Compiler => Compiler (Type checker)


Comment:

 Bug still present in HEAD (ghc-7.9.20141125).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5777#comment:12>
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