[GHC] #14880: GHC panic: updateRole

[GHC]

#14880: GHC panic: updateRole
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        Reporter:  RyanGlScott       |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.2.2
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #15076            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 Yes, I have a fix
 [https://github.com/goldfirere/ghc/commit/7386ea571cdd50d45432e20a5318e7e870f0176b
 here], but it causes a failure in, e.g., indexed-
 types/should_compile/T12369. Haven't had time to investigate.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14880#comment:13>
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