[GHC] #2731: Avoid unnecessary evaluation when unpacking constructors

[GHC]

#2731: Avoid unnecessary evaluation when unpacking constructors
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        Reporter:  simonpj                  |            Owner:
            Type:  bug                      |           Status:  new
        Priority:  lowest                   |        Milestone:  7.6.2
       Component:  Compiler                 |          Version:  6.8.3
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  Runtime performance bug  |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
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Changes (by jstolarek):

 * cc: jan.stolarek@… (added)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2731#comment:9>
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