[issue18945] Name collision handling in tempfile is not covered by tests

[R. David Murray]

R. David Murray added the comment:

We don't generally backport tests unless they are part of a bug fix.  It's not a blanket prohibition, but normally the risk of false positives in a maintenance release on platforms not covered by our buildbots outweighs the benefits of adding the tests.

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nosy: +r.david.murray

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<http://bugs.python.org/issue18945>
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