[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):  Phab:D4769
       Wiki Page:                    |
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Comment (by simonpj):

 Maybe try (3) in comment:59?  That makes before-and-after more similar.

 It might help to put it all on a branch... I'm not sure of the precise
 code you are measuring.

 (It's cool that balanced unions are actually faster.  FOUR TIMES faster!)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14880#comment:65>
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