[GHC] #9630: compile-time performance regression (probably due to Generics)

[GHC]

#9630: compile-time performance regression (probably due to Generics)
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        Reporter:  hvr               |                Owner:  dfeuer
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.9
      Resolution:                    |             Keywords:  deriving-
                                     |  perf, Generics
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9583, #10293,    |  Differential Rev(s):  Phab:D3656
  #13059, #10818                     |
       Wiki Page:                    |
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Comment (by dfeuer):

 FYI, the case that fails with tick exhaustion for (apparently) absolutely
 everything from 7.4 onward is
 [https://gist.github.com/treeowl/ca72b86ea4593e784e61b03ff28e26c7 in this
 gist]. Ryan says it worked fine in 7.2, but I doubt it'll be useful to try
 to figure out just what made that happen.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9630#comment:65>
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