[GHC] #9557: Deriving instances is slow

[GHC]

#9557: Deriving instances is slow
-------------------------------------+-------------------------------------
              Reporter:  Feuerbach   |            Owner:
                  Type:  bug         |           Status:  closed
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:  duplicate   |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:  #8731
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Changes (by carter):

 * status:  new => closed
 * resolution:   => duplicate
 * related:   => #8731


Comment:

 I think this is likely a dupe of #8731

 This is a problem that impacts many many projects directly and indirectly
 (and epecshows up when folks )

 I'm marking it as a duplicate for now.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9557#comment:3>
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