[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):

 >  with no apparent performance problems.

 I would love it if it was possible to do a `nofib`-style run on
 `testsuite/perf`, producing a table showing changes before and after.

 The current testsuite stuff just tells if you get more than 5% worse (or
 whatever). There could easily be a big swing we never see.  It's laborious
 running the tests one by one.

 Would be possible for `nofib-analyse` to look at the logs somehow?  It'd
 be extremely helpful.

 Meanwhile, yes, let's commit.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14880#comment:27>
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