[GHC] #11245: Non-exhaustive pattern, "Patterns not matched" list is empty

[GHC]

#11245: Non-exhaustive pattern, "Patterns not matched" list is empty
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        Reporter:  osa1              |                Owner:  gkaracha
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by gkaracha):

 Ah, yes, this is easy to do I guess. We can always check every uncovered
 vector before printing for being `[]`. If yes, we can print something
 like:
 {{{
 Exhaustive.hs:10:7: warning:
     Pattern match(es) are non-exhaustive
     In the definition for ‘a’: Cases not matched:
       (incomplete guards)
 }}}
 I am gonna patch this too :)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11245#comment:4>
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