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Test decorator for capturing stdout/stderr/both.

Based on original code from Fabric 1.x, specifically:

* fabric/tests/utils.py
* as of Git SHA 62abc4e17aab0124bf41f9c5f9c4bc86cc7d9412

Though modifications have been made since.
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    An IO wrapper capable of multiplexing its writes to other buffer objects.
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        If ``cc`` is given and is a file-like object or an iterable of same,
        it/they will be written to whenever this instance is written to.
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    Replace sys.std(out|err) with a wrapper during execution, restored after.

    In addition, a new combined-streams output (another wrapper) will appear at
    ``sys.stdall``. This stream will resemble what a user sees at a terminal,
    i.e. both out/err streams intermingled.
    cs{t�t_tjtdtj�}t_tjtdtj�}t_z�||�SWd|t_|t_t`XdS(NR	(Rtsyststdalltstdouttstderr(targstkwargst	my_stdoutt	my_stderr(tfunc(sD/opt/alt/python27/lib/python2.7/site-packages/pytest_relaxed/trap.pytwrapperFs		(R(R"R#((R"sD/opt/alt/python27/lib/python2.7/site-packages/pytest_relaxed/trap.pyttrap=s	(	RRt	functoolsRR
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