[GHC] #5821: SPECIALISE fails with a cryptic warning

[GHC]

#5821: SPECIALISE fails with a cryptic warning
-------------------------------------+-------------------------------------
        Reporter:  rl                |                   Owner:  ezyang
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.1
       Component:  Compiler          |                 Version:  7.5
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by ezyang):

 * owner:   => ezyang
 * milestone:  7.12.1 => 7.10.1


Comment:

 I think we can nail this for 7.10. I'll attempt a patch.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5821#comment:9>
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