[GHC] #5267: Arrow command combinators

[GHC]

#5267: Arrow command combinators
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  Reporter:  peteg                        |          Owner:  ross            
      Type:  bug                          |         Status:  new             
  Priority:  normal                       |      Milestone:  7.4.1           
 Component:  Compiler                     |        Version:  7.0.3           
Resolution:                               |       Keywords:                  
  Testcase:                               |      Blockedby:                  
Difficulty:                               |             Os:  Unknown/Multiple
  Blocking:                               |   Architecture:  Unknown/Multiple
   Failure:  GHC accepts invalid program  |  
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Comment(by simonpj):

 See also #5609

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5267#comment:16>
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