[GHC] #5813: Offer a compiler warning for failable pattern matches

[GHC]

#5813: Offer a compiler warning for failable pattern matches
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    Reporter:  snoyberg          |       Owner:                  
        Type:  feature request   |      Status:  new             
    Priority:  normal            |   Milestone:  7.6.1           
   Component:  Compiler          |     Version:  7.2.2           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Changes (by maeder):

 * cc: Christian.Maeder@… (added)


Comment:

 I think, it is definitely worth a flag, since you get a warning if you
 desugar "do" manually to
 "`... >>= \ (Just y) -> ...`".

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5813#comment:4>
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