[issue30416] constant folding opens compiler to quadratic time hashing

[Mark Dickinson]

Mark Dickinson added the comment:

After testing on Python 2, I was surprised to discover that this issue was introduced to the 2.x series quite recently: 2.7.11 doesn't have the issue, while 2.7.13 does.

The culprit appears to be this commit: https://github.com/python/cpython/commit/67edf73183b8bf0127456454747f596428cc28f6, introduced as part of issue 27942.

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nosy: +mark.dickinson

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<http://bugs.python.org/issue30416>
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