[GHC] #13719: checkFamInstConsistency dominates compile time

[GHC]

#13719: checkFamInstConsistency dominates compile time
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        Reporter:  niteria           |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.3
  checker)                           |
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13092, #13099,   |  Differential Rev(s):  phab:D3600,
  #12191                             |  phab:D3602, phab:D3603
       Wiki Page:                    |
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Changes (by niteria):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 From my perspective this is fixed.

 It's a localized change with a nice upside, so we might want to merge to
 `ghc-8.2`.
 It applies cleanly, except for the testsuite.

 I'm happy to do the legwork, but I will leave the decision to Ben.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13719#comment:8>
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