[GHC] #13092: family instance consistency checks are too pessimistic

[GHC]

#13092: family instance consistency checks are too pessimistic
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        Reporter:  rwbarton          |                Owner:  rwbarton
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13719            |  Differential Rev(s):  Phab:D2992,
       Wiki Page:                    |  Phab: D3603
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Changes (by niteria):

 * differential:  Phab:D2992 => Phab:D2992, Phab: D3603
 * related:   => #13719


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13092#comment:16>
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