[GHC] #9328: MINIMAL pragma should supprt negation

[GHC]

#9328: MINIMAL pragma should supprt negation
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        Reporter:  augustss          |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by augustss):

 Yes, you could say that.  Implementing nothing is `MINIMAL`, but if you
 implement `to` you must also implement `from` (and v.v.).  But I think
 it's a natural extension of the `MINIMAL` pragma.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9328#comment:2>
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