[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 simonmar):

 The patch looks ok.  I would refactor it a bit, like this:

 {{{
   when (not success) $ maybe (return ()) lift sourceErrorHandler
   runCommands' eh sourceErrorHandler gCmd
 }}}

 Don't forget to add a test to testsuite/tests/ghci.  If the testsuite
 isn't working right now, search for a ticket about that, and if there
 isn't one, make one :-)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7962#comment:8>
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