[GHC] #14594: 2 modules / 2500LOC takes nearly 3 minutes to build

[GHC]

#14594: 2 modules / 2500LOC takes nearly 3 minutes to build
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        Reporter:  schyler           |                Owner:  dfeuer
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Yes, we can definitely get big type-blowup.
 See ​http://research.microsoft.com/en-
 us/um/people/simonpj/papers/variant-f/if.pdf, page 5.  cf #5227.

 But that would show up clearly through the sizes reported by `-dshow-
 passes`.  comment:3 shows some large numbers.  What numbers do you see
 now?  Do we have a standalone reproducer?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14594#comment:18>
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