[GHC] #8634: Relax functional dependency coherence check ("liberal coverage condition")

[GHC]

#8634: Relax functional dependency coherence check ("liberal coverage condition")
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        Reporter:  danilo2         |            Owner:
            Type:  feature         |           Status:  new
  request                          |        Milestone:  7.10.1
        Priority:  high            |          Version:  7.7
       Component:  Compiler        |         Keywords:
      Resolution:                  |     Architecture:  Unknown/Multiple
Operating System:                  |       Difficulty:  Unknown
  Unknown/Multiple                 |       Blocked By:
 Type of failure:  None/Unknown    |  Related Tickets:  #1241, #2247, #8356
       Test Case:                  |
        Blocking:                  |
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Comment (by goldfire):

 See https://phabricator.haskell.org/D69

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8634#comment:10>
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