[GHC] #11386: Improve error message

[GHC]

#11386: Improve error message
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        Reporter:  Iceland_jack      |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10362            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 Simon says "There should be no user-visible effects." in ticket #10362.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11386#comment:2>
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