Re: #16201: ghci063 failing on Darwin

#16201: ghci063 failing on Darwin
---------------------------------+----------------------------------------
        Reporter:  bgamari       |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  highest       |            Milestone:  8.8.1
       Component:  Compiler      |              Version:  8.6.3
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
---------------------------------+----------------------------------------

Comment (by RyanGlScott):

 Ironically, `ghci063` is now breaking the CI build on `validate-
 x86_64-darwin` because it is unexpectedly passing (nondeterministically,
 of course). Here is an example from a [https://ghc-
 gitlab.s3.amazonaws.com/6b/86/6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b/2019_02_24/34776/53677/job.log
 ?response-content-type=text/plain%3B%20charset%3Dutf-8&response-content-
 disposition=inline&X-Amz-Expires=600&X-Amz-Date=20190224T105625Z&X-Amz-
 Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAI3NPPHETCY4XXTOA/20190224
 /us-east-1/s3/aws4_request&X-Amz-SignedHeaders=host&X-Amz-
 Signature=4f88ddb6c4ecf5cb462c3b70b16a2e4e3f5d8a25a107a97621d1e942d51f7a48
 recent run]:

 {{{
 =====> ghci063(ghci) 1644 of 6844 [0, 0, 0]
 cd "ghci/scripts/ghci063.run" &&
 HC="/Users/builder/builds/b4bc6410/0/ghc/ghc/inplace/bin/ghc-stage2"
 HC_OPTS="-dcore-lint -dstg-lint -dcmm-lint -no-user-package-db -rtsopts
 -fno-warn-missed-specialisations -fshow-warning-groups -fdiagnostics-
 color=never -fno-diagnostics-show-caret -Werror=compat -dno-debug-output "
 "/Users/builder/builds/b4bc6410/0/ghc/ghc/inplace/bin/ghc-stage2"
 --interactive -v0 -ignore-dot-ghci -fno-ghci-history +RTS -I0.1 -RTS
 -fghci-leak-check -dcore-lint -dstg-lint -dcmm-lint -no-user-package-db
 -rtsopts -fno-warn-missed-specialisations -fshow-warning-groups
 -fdiagnostics-color=never -fno-diagnostics-show-caret -Werror=compat -dno-
 debug-output   < ghci063.script

 <elided>

 *** unexpected pass for ghci063(ghci)

 <elided>

 SUMMARY for test run started at Sat Feb 23 21:45:56 2019 PST
  0:27:56 spent to go through
     6844 total tests, which gave rise to
    26554 test cases, of which
    19254 were skipped

       42 had missing libraries
     7156 expected passes
      101 expected failures

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

 Unexpected passes:
    ghci/scripts/ghci063.run  ghci063 [unexpected] (ghci)
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16201#comment:1>