[GHC] #13209: ghc panic with optimization.

[GHC]

#13209: ghc panic with optimization.
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        Reporter:  1chb              |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86
 Type of failure:  GHC rejects       |            Test Case:
  valid program                      |
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by j.waldmann):

 Perhaps the error type and error message should be changed here.

 "1chb" literally followed the suggestion to report a bug.
 {{{
 ghc: panic! (the 'impossible' happened)
 ...
 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13209#comment:5>
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