[GHC] #10818: GHC 7.10.2 takes much longer to compile some packages

[GHC]

#10818: GHC 7.10.2 takes much longer to compile some packages
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        Reporter:  kazu-yamamoto     |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9630             |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by dfeuer):

 * related:   => #9630


Comment:

 It looks like the same commit that causes the regression in `Data.IP.Addr`
 here was also responsible for the much more dramatic
 `Language.Haskell.Extension` regression described in #9630.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10818#comment:22>
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