[issue1492704] distinct error type if shutil.copyfile() fails because of src and dst are the same file

[Roundup Robot]

Roundup Robot added the comment:

New changeset 276227a93f6f by R David Murray in branch 'default':
whatsnew: shutil copyfile SameFileError (#1492704)
http://hg.python.org/cpython/rev/276227a93f6f

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<http://bugs.python.org/issue1492704>
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