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

[GHC]

#11640: Panic because of "updateRole"
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        Reporter:  Iceland_jack      |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      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 Simon Peyton Jones <simonpj@…>):

 In [changeset:"f6e58be297f97e8871396f80a81fe3a9984d77b9/ghc" f6e58be/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="f6e58be297f97e8871396f80a81fe3a9984d77b9"
 Test Trac #11640
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11640#comment:4>
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