[issue29737] Optimize concatenating empty tuples

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The PR already was merged when you wrote your comment Raymond. If you insist I can revert it. But 0f7b0b397e12514ee213bc727c9939b66585cbe2 depends on it.

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<http://bugs.python.org/issue29737>
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