[GHC] #11386: Improve error message

[GHC]

#11386: Improve error message
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        Reporter:  Iceland_jack      |                Owner:
            Type:  task              |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1-rc1
      Resolution:  wontfix           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10362            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 I'm fine with closing it

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11386#comment:6>
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