[GHC] #12696: Exception gives not enough information to be useful

[GHC]

#12696: Exception gives not enough information to be useful
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        Reporter:  flip101           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  exception
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 It still isn't clear to me what the code is which causes the exception.
 Could you please provide a test case which you can invoke with one
 invocation of the 'ghc' executable which shows the error you think is bad?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12696#comment:5>
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