[GHC] #7633: Checkable "minimal complete definitions"

[GHC]

#7633: Checkable "minimal complete definitions"
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        Reporter:  shachaf           |            Owner:
            Type:  feature request   |           Status:  patch
        Priority:  normal            |        Milestone:  7.8.1
       Component:  Compiler          |          Version:  7.6.1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #6028
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Comment (by nomeata):

 I just read through the patch, and it seems to be useful and well-done.

 Minor point: The call to {{{warnMissingMethodOrAT}}} can be removed
 instead of just commenting it out.

 There is a new call to `mkClass` in
 http://git.haskell.org/ghc.git/blob/17a868afa169c52d8525a95cbed87b2fc12044c6:/compiler/prelude/TysWiredIn.lhs#l478,
 so the patch needs to be updated again slightly.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7633#comment:27>
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