[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:  8.8.1
       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):  Phab:D4769
       Wiki Page:                    |
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Comment (by tdammers):

 Yes, will do. Rebasing the whole thing on `HEAD` is going to be a bit
 hairy, but no show stopper.

 One thing I find remarkable is that `Set` doesn't do the existence test,
 but I guess that's just a matter of prioritizing CPU over RAM that turns
 out in our disadvantage in this specific case.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14880#comment:98>
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