[GHC] #10753: Type checker fails to recognize equality

[GHC]

#10753: Type checker fails to recognize equality
-------------------------------------+-------------------------------------
        Reporter:  ljli              |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler (Type    |                 Version:  7.10.2
  checker)                           |
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by simonpj):

 Yes this is a bug, actually a dup of #10340.  Sadly the fix was not
 straightforward and won't end up in 7.10.  I hope you can work around it
 meanwhile.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10753#comment:1>
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