[GHC] #5930: add System.Environment.lookupEnv which returns Maybe instead of an exception

[GHC]

#5930: add System.Environment.lookupEnv which returns Maybe instead of an
exception
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    Reporter:  elaforge          |       Owner:  pcapriotti      
        Type:  feature request   |      Status:  patch           
    Priority:  normal            |   Milestone:                  
   Component:  libraries/base    |     Version:  7.4.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Changes (by pcapriotti):

  * owner:  => pcapriotti
  * difficulty:  => Unknown


-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5930#comment:3>
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