[GHC] #8731: long compilation time for module with large data type and partial record selectors

[GHC]

#8731: long compilation time for module with large data type and partial record
selectors
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        Reporter:  carter                        |            Owner:
            Type:  bug                           |           Status:  new
        Priority:  normal                        |        Milestone:
       Component:  Compiler                      |          Version:
      Resolution:                                |  7.8.1-rc1
Operating System:  Unknown/Multiple              |         Keywords:
 Type of failure:  Compile-time performance bug  |     Architecture:
       Test Case:                                |  Unknown/Multiple
        Blocking:                                |       Difficulty:
                                                 |  Unknown
                                                 |       Blocked By:
                                                 |  Related Tickets:
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Comment (by carter):

 rwbarton (on irc) noted this single module also has a nearly 1mb object
 file! Also apparently most of the code generated / time might be related
 to the Read and Show instances. (i've not check the latter myself, but
 sounds plausible)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8731#comment:2>
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