[GHC] #7859: runghc should give an error when the path to ghc is invalid

[GHC]

#7859: runghc should give an error when the path to ghc is invalid
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    Reporter:  monoidal          |       Owner:  igloo                            
        Type:  bug               |      Status:  patch                            
    Priority:  normal            |   Milestone:                                   
   Component:  None              |     Version:  7.6.3                            
    Keywords:                    |          Os:  Unknown/Multiple                 
Architecture:  Unknown/Multiple  |     Failure:  Incorrect warning at compile-time
  Difficulty:  Unknown           |    Testcase:                                   
   Blockedby:                    |    Blocking:                                   
     Related:                    |  
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Changes (by simonpj):

  * owner:  => igloo
  * difficulty:  => Unknown


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7859#comment:2>
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