[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
      Resolution:                |             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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Comment (by bgamari):

 I forgot to mention that stdout is only empty when the test is run via the
 testsuite driver (e.g. `make test TEST=T7037`). Running `make
 T3037`directly produces `"ok"` as expected. Presumably there is something
 funny going on with the testsuite driver's redirection of stdout.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12725#comment:1>
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