[GHC] #10829: Simplification in the RHS of rules

[GHC]

#10829: Simplification in the RHS of rules
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        Reporter:  afarmer           |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  7.10.3
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10528            |  Differential Rev(s):  Phab:D1246
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Comment (by afarmer):

 So it looks like the output for T7785 was changed by SPJ in
 45d9a15c4b85a2ed89579106bdafd84accf2cb39, which is the commit that this
 issue is addressing anyway, so I just changed the output back to what it
 was before and the test passes.

 Going to start stackage build soon.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10829#comment:20>
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