[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):

 Replying to [comment:112 goldfire]:
 > > Where exactly is this change??
 >
 > See changes to FV.hs and UniqDFM.hs here (which is the changeset for the
 original patch):
 >
 https://github.com/ghc/ghc/compare/bfc1fc2566944a455572303cbb2cbbf0c539c871...wip/T14880
 >
 > Otherwise, go ahead with comment::110.

 That's the entire changeset for T14880 though, isn't it? But we're really
 talking about fixing the insertion order for `FV` and `UniqDFM` for this
 step IIUC. So:

 Step 0: Fix FV / UniqDFM insertion order
 Step 1: Refactor `tyCoVars...` to use accumulator-style VarSet (Simon's
 patch)
 Step 2: Close over kinds at the end
 Step 3: "Everything else"

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14880#comment:114>
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