[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 goldfire):

 This [wiki:Building/RunningTests/Adding wiki page] tells you how to add
 test cases. As for documentation, you should edit
 `docs/users_guide/glasgow_exts.xml`. The format there is that for
 DocBooks, but it's easy enough just to parrot the code that's in there. Is
 this enough guidance?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8634#comment:55>
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