[GHC] #12725: T7037 is broken on Windows

[GHC]

#12725: T7037 is broken on Windows
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           Reporter:  bgamari         |             Owner:
               Type:  bug             |            Status:  new
           Priority:  normal          |         Milestone:  8.2.1
          Component:  Compiler        |           Version:  8.1
           Keywords:                  |  Operating System:  Windows
       Architecture:  x86_64 (amd64)  |   Type of failure:  None/Unknown
          Test Case:                  |        Blocked By:
           Blocking:                  |   Related Tickets:
Differential Rev(s):                  |         Wiki Page:
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 `T7037` appears to fail on Windows. Namely, `stdout` appears to be empty,
 whereas the expected output is `"ok"`. I had suspected that the issue was
 the `execv` call failing but this doesn't seem to be thew case; no code
 after `execv` is executed. A problem for another day...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12725>
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