[GHC] #12003: Improve error message about closed variables

[GHC]

#12003: Improve error message about closed variables
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        Reporter:                    |                Owner:
  facundo.dominguez                  |
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
                                     |  StaticPointers
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11656            |  Differential Rev(s):  Phab:D2167
       Wiki Page:                    |
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Changes (by facundo.dominguez):

 * cc: mboes (added)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12003#comment:2>
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