[GHC] #13056: Deriving Foldable causes GHC to take a long time (GHC 8.0 ONLY)

[GHC]

#13056: Deriving Foldable causes GHC to take a long time (GHC 8.0 ONLY)
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        Reporter:  ezyang            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2-rc2
      Resolution:                    |             Keywords:  deriving-perf
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12234            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Ryan you are so fast!  Could you add your stripped-down tests as a
 performance regression test?  Probably redundant, but always good to check
 that we don't accidentally break it again.  Thanks!

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13056#comment:6>
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