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

[GHC]

#7633: Checkable "minimal complete definitions"
-------------------------------------+------------------------------------
        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
-------------------------------------+------------------------------------

Comment (by hvr):

 btw, while fixing up some test-cases for the shortly to follow `ghc-prim`
 patch, I noticed the following indentation error in T6002

 {{{#!hs
 instance Eq (Hidden Nat') where
 Hide a == Hide b = sameNat' a b
 }}}

 which triggered a warning now

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7633#comment:31>
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