[GHC] #12213: In Python testsuite, setting stdout to unbuffered causes us to switch to ascii output locale

[GHC]

#12213: In Python testsuite, setting stdout to unbuffered causes us to switch to
ascii output locale
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        Reporter:  ezyang            |                Owner:  thomie
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Test Suite        |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ezyang):

 If it is Unicode output, but the output is what we "expected", then the
 test suite driver doesn't try to print it and there is no error. The
 second thing is that for direct invocations, the driver twiddles
 environment variables so that GHC does not produce Unicode, so you need to
 do something like a run_command test.

 So, one way to get the error is to do this:

 1. Open `tests/typecheck/should_compile/tc170.hs` and add a type error,
 e.g., `x = True :: Int`
 2. Run `make TEST=tc170`
 3. Error!

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12213#comment:4>
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