[GHC] #11640: Panic because of "updateRole"

[GHC]

#11640: Panic because of "updateRole"
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        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
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 simonpj):

 Same thing happens in HEAD too.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11640#comment:1>
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