[GHC] #7962: "ghc -e <invalid expression>" should return non-zero exit status

[GHC]

#7962: "ghc -e <invalid expression>" should return non-zero exit status
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        Reporter:  timmaxw          |            Owner:
            Type:  feature request  |           Status:  new
        Priority:  normal           |        Milestone:
       Component:  GHCi             |          Version:  7.6.2
      Resolution:                   |         Keywords:
Operating System:  Linux            |     Architecture:  Unknown/Multiple
 Type of failure:  Other            |       Difficulty:  Unknown
       Test Case:                   |       Blocked By:
        Blocking:                   |  Related Tickets:
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Comment (by khyperia):

 Patch created and attached.

 The test suite currently does not run on my Windows machine ("tee:
 standard output: Permission denied", followed by a hang), so I was unable
 to run the validation script.

 As this is my first patch, please tell me what I did wrong :)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7962#comment:7>
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