[GHC] #11700: pattern match bug

[GHC]

#11700: pattern match bug
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        Reporter:  TobyGoodwin       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  https://github.com/TobyGoodwin/odd-
                                     |  ghc-pattern-bug
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Can you explain how to reproduce, preferably without installing all of
 Yesod?  (eg can you cut it down somehow?)

 The readme on the odd-ghc-pattern-bug github doesn't give repro
 instructions.

 Thanks

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11700#comment:2>
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