[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 simonpj):

 > See changes to FV.hs and UniqDFM.hs

 OK: these two look like another unrelated change, so let's do them in Step
 1a (after the rest of step 1), so that if they cause perf wibbles we know
 what the culprit is.

 Then we can move on to the semantically important changes: steps 2, and 3.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14880#comment:113>
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