[GHC] #2204: Improve 'patterns not matched' warnings

[GHC]

#2204: Improve 'patterns not matched' warnings
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        Reporter:  Deewiant          |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  low               |        Milestone:  _|_
       Component:  Compiler          |          Version:  6.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonpj):

 See also #5724 (closed as dup) for another report.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2204#comment:6>
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