[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:                    |  Phab:D5141
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Comment (by tdammers):

 Step 2 implemented here, on top of step 1:

 http://git.haskell.org/ghc.git/commit/2728d63f0a42251d24d5fc4f044633f981891131

 Unfortunately, this causes regressions:

 {{{
 Unexpected results from:
 TEST="T12150 T12227 T12545 T5321Fun T5631"

 SUMMARY for test run started at Tue Sep 11 12:37:11 2018 CEST
  0:05:56 spent to go through
      110 total tests, which gave rise to
      526 test cases, of which
      416 were skipped

        4 had missing libraries
      101 expected passes
        0 expected failures

        0 caused framework failures
        0 caused framework warnings
        0 unexpected passes
        0 unexpected failures
        5 unexpected stat failures

 Unexpected stat failures:
    compiler/T5631.run     T5631 [stat not good enough] (normal)
    compiler/T5321Fun.run  T5321Fun [stat not good enough] (normal)
    compiler/T12227.run    T12227 [stat not good enough] (normal)
    compiler/T12545.run    T12545 [stat not good enough] (normal)
    compiler/T12150.run    T12150 [stat not good enough] (optasm)
 }}}

 It's possible that I made mistakes in manually porting the patch onto
 master, so by all means please review.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14880#comment:121>
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