[GHC] #10176: Invalid core generated with GHC 7.10 RC3

[GHC]

#10176: Invalid core generated with GHC 7.10 RC3
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        Reporter:  NeilMitchell      |                   Owner:
            Type:  bug               |                  Status:  patch
        Priority:  high              |               Milestone:  7.10.1
       Component:  Compiler          |                 Version:  7.10.1-rc3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by simonpj):

 I've checked Phab:D747 which looks great to me; i've made some
 suggestions.

 Maybe we can turn comment:17 into a test that not only should compile (as
 D747 has) but should run also. thanks!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10176#comment:18>
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