[GHC] #15068: Small number of test case failures on Ubuntu Bionic (GCC 7.3)

[GHC]

#15068: Small number of test case failures on Ubuntu Bionic (GCC 7.3)
-------------------------------------+-------------------------------------
        Reporter:  jrp               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.1
  (CodeGen)                          |
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  Incorrect result  |            Test Case:  T13658
  at runtime                         |  T14779a T14779b T14868 debug
                                     |  parsing001
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by jrp):

 Today, the failures are up to:

 TEST="T13658 T14779a T14779b T14868 T14955 debug"

 {{{
  -dcmm-lint -no-user-package-db -rtsopts -fno-warn-missed-specialisations
 -fshow-warning-groups -fdiagnostics-color=never -fno-diagnostics-show-
 caret -dno-debug-output  -O
 cd "./perf/should_run/T14955.run" && ./T14955 +RTS -V0 -tT14955.stats
 --machine-readable -RTS
 Actual stdout output differs from expected:
 diff -uw "./perf/should_run/T14955.run/T14955.stdout.normalised"
 "./perf/should_run/T14955.run/T14955.run.stdout.normalised"
 --- ./perf/should_run/T14955.run/T14955.stdout.normalised       2018-04-27
 00:10:03.056784655 +0100
 +++ ./perf/should_run/T14955.run/T14955.run.stdout.normalised   2018-04-27
 00:10:03.060784652 +0100
 @@ -1 +1 @@
 -
 +True
 *** unexpected failure for T14955(normal)

 Unexpected results from:
 TEST="T14955"
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15068#comment:5>
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