[GHC] #7669: Empty case causes warning

[GHC]

#7669: Empty case causes warning
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        Reporter:  goldfire          |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.7
      Resolution:  duplicate         |                Keywords:  EmptyCase
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Incorrect         |               Test Case:
  warning at compile-time            |  deSugar/should_compile/T7669
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by bgamari):

 The issue of no warnings being produced despite non-exhaustive pattern
 matches (described in comment:3) has been reported separately as #10746.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7669#comment:9>
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