[GHC] #12990: Partially applied constructors with unpacked fields simplified badly

[GHC]

#12990: Partially applied constructors with unpacked fields simplified badly
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        Reporter:  dfeuer            |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  Inlining
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  D2891
       Wiki Page:                    |
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Changes (by dfeuer):

 * status:  new => patch
 * differential:   => D2891


Comment:

 The change Simon suggests does indeed seem to work. I get the code I want
 from my `Traversable` test case now.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12990#comment:8>
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