[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:              |  Related Tickets:  #1241, #2247,
  None/Unknown                       |  #8356, #9103, #9227
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D69    |
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Comment (by syallop):

 Replying to [comment:46 neo]:
 > Hi! I'm not sure if I face the same problem as the issue author or if my
 code is just "wrong" but when testing my code with GHC 7.8 I get the
 [https://travis-ci.org/adp-multi/adp-multi/jobs/34132805#L437 same error]
 while it worked with 7.6.
 I believe you do. I can confirm that your code compiles with
 -XDysfunctionalDependencies.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8634#comment:47>
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