[issue4265] shutil.copyfile() leaks file descriptors when disk fills

[Tres Seaver]

Tres Seaver <tseaver at agendaless.com> added the comment:

This patch adds tests for the four edge cases (opening source fails, opening dest fails, closing dest fails, closing source fails).

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Added file: http://bugs.python.org/file17229/issue4265-test_copyfile_exceptions.patch

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