[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):

 Richard, in the original patch you say

 > Also while working on this, I noticed that GHC wasn't doing its best job
 at keeping left-to-right ordering of type variables in cases where it
 doesn't really matter, but still would be nice. I've made some
 improvements in this area.

 Where exactly is this change??

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14880#comment:109>
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