[GHC] #8095: TypeFamilies painfully slow

[GHC]

#8095: TypeFamilies painfully slow
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        Reporter:  MikeIzbicki       |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.1
       Component:  Compiler (Type    |              Version:  7.6.3
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  5321              |  Differential Rev(s):
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Comment (by bgamari):

 For the record, #7428 is characterized by a similar blow-up in coercions.
 I'm not quite sure whether it's the same cause, but it is eerily
 reminiscent.

 Disabling production of coercions is an interesting idea; I wonder how
 much this would actually improve compilation speed in the non-pathological
 cases.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8095#comment:14>
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