[GHC] #9916: ghc -e ":foo bar" exit status is inconsistent

[GHC]

#9916: ghc -e ":foo bar" exit status is inconsistent
-------------------------------------+-------------------------------------
       Reporter:  rwbarton           |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  low                |               Milestone:
      Component:  GHCi               |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:  #7962, #9905       |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 Since #7962 `ghc -e EXPR` exits with status code 1 if `EXPR` fails to
 compile. While it's undocumented, `ghc -e` does also accept anything
 that's valid input to GHCi, including GHCi commands like `:t`. In this
 case, the exit code of `ghc -e` is not always 1 when the command
 apparently failed. For example, all of:

 {{{
 ghc -e ':t'
 ghc -e ':t +'
 ghc -e ':t ='
 ghc -e ':t x'
 ghc -e ':l nonexistentfile.hs'
 }}}

 exit with status code 0. But `ghc -e ':l a'` exits with status code 1,
 because `a` is not a (possible) module name or a source file.

 (At the code level, `ghc -e ":foo bar"` currently exits with status code 1
 when the function for `:foo` raises an exception, and with status code 0
 in all other cases.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9916>
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