[GHC] #9380: ghc generates seemingly incorrect code

[GHC]

#9380: ghc generates seemingly incorrect code
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              Reporter:  qnikst      |            Owner:
                  Type:  bug         |           Status:  closed
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:  fixed       |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Incorrect   |       Blocked By:
  result at runtime                  |  Related Tickets:
             Test Case:  gadt/T9380  |
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 I think HEAD is fine here.  The call `view YA` gets type `Y (Any X)`, and
 that's a very reasonable type for it.

 I don't see a difficulty here.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9380#comment:7>
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