[GHC] #12491: ghc-iserv pattern match failure with no command line arguments

[GHC]

#12491: ghc-iserv pattern match failure with no command line arguments
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.2
       Component:  GHCi              |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2494
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"3005fa5313b6d5fd9d4f47192c84e96e94ee7f17/ghc"
 3005fa53/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="3005fa5313b6d5fd9d4f47192c84e96e94ee7f17"
 iserv: Show usage message on argument parse failure

 Test Plan: validate

 Reviewers: simonmar, erikd, austin

 Reviewed By: simonmar, erikd

 Subscribers: thomie, erikd

 Differential Revision: https://phabricator.haskell.org/D2494

 GHC Trac Issues: #12491
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12491#comment:3>
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