[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:  8.2.1
       Component:  Compiler (Type    |              Version:  7.6.3
  checker)                           |
      Resolution:                    |             Keywords:  TypeFamilies
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):
       Wiki Page:                    |
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Comment (by goldfire):

 It somehow didn't make it onto the ticket, but there was a concern about
 this idea: once you omit coercions from one module, then all downstream
 modules are also missing (some) coercions. This means that `-dcore-lint`
 doesn't do nearly as much as it normally does. That makes me a bit
 uncomfortable, but perhaps it's OK.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8095#comment:23>
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