[GHC] #1593: Improve runInteractiveProcess error message when working directory does not exist

[GHC]

#1593: Improve runInteractiveProcess error message when working directory does not
exist
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 Reporter:  tomasz.zielonka at gmail.com  |          Owner:  simonmar
     Type:  task                       |         Status:  reopened
 Priority:  low                        |      Milestone:  _|_     
Component:  libraries/process          |        Version:  6.7     
 Severity:  normal                     |     Resolution:          
 Keywords:                             |     Difficulty:  Unknown 
 Testcase:  process004                 |   Architecture:  Unknown 
       Os:  Unknown                    |  
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Comment (by wferi):

 Just don't forget closing `parentCWD` in the child, before exec. Like I
 did...

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1593#comment:9>
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