[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 1chb):

 Replying to [comment:5 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)
 Yes, actually not that impossible.

 > ...
 > Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 > }}}
 >
 Well, it is still a bug. Maybe explain that it is a known bug and need not
 be reported again. As a workaround, choose another compiler/language. :)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13209#comment:7>
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