[issue18644] Got ResourceWarning: unclosed file when using test function from formatter module

[Eric V. Smith]

Eric V. Smith added the comment:

Good point on contextlib.closing not being needed. I usually use this pattern on things that aren't files!

On second thought, the with statement will close sys.stdin, so this isn't a valid pattern here. Sorry for the noise.

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<http://bugs.python.org/issue18644>
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