[issue29657] os.symlink: FileExistsError shows wrong message

[Xiang Zhang]

Xiang Zhang added the comment:

I concur the current message is misleading.

OSError makes the string "file1 -> file2". This also affects other methods calling `path_error2()` such as os.link().

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nosy: +xiang.zhang
versions: +Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29657>
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