[GHC] #15287: T11627[ab] fail on some Darwin environments

[GHC]

#15287: T11627[ab] fail on some Darwin environments
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.4.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 As of d6216443c61cee94d8ffc31ca8510a534d9406b9 I am seeing `T11627a` and
 `T11627b` fail in the `prof_hr` way on Darwin under CircleCI (but not
 Harbormaster!):
 {{{
 Wrong exit code for T11627b(prof_hr)(expected 0 , actual 139 )
 Stderr ( T11627b ):
 /bin/sh: line 1: 73247 Segmentation fault: 11  ./T11627b +RTS -hr -RTS
 +RTS -i0 -RTS
 *** unexpected failure for T11627b(prof_hr)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15287>
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