[GHC] #15383: T3171 doesn't terminate with Interrupted message on Darwin

[GHC]

#15383: T3171 doesn't terminate with Interrupted message on Darwin
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           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         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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 I am seeing `T3171` fail with incorrect stderr output on Darwin (e.g.
 https://circleci.com/gh/ghc/ghc/7106):
 {{{
 Actual stdout output differs from expected:
 --- ./ghci/should_run/T3171.run/T3171.stdout.normalised 2018-07-14
 21:24:25.000000000 -0700
 +++ ./ghci/should_run/T3171.run/T3171.run.stdout.normalised     2018-07-14
 21:24:25.000000000 -0700
 @@ -1 +0,0 @@
 -Interrupted.
 *** unexpected failure for T3171(normal)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15383>
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