[GHC] #14880: GHC panic: updateRole

[GHC]

#14880: GHC panic: updateRole
-------------------------------------+-------------------------------------
        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:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 > What I was trying to say is that (3) seems to be responsible

 So you think that using `VarSet`, but with an accumulator style, will be
 fastest of all?

 And yet comment:71 suggests that switching to accumulator style should not
 have any effect on `VarSet`.  Maybe I was benchmarking the wrong thing.

 Anyway, yes please try!

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14880#comment:91>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler