[issue1721518] Small case which hangs

[Matthew Barnett]

Matthew Barnett <python at mrabarnett.plus.com> added the comment:

This problem has been addressed in issue #2636.

Although the extra checks certainly aren't foolproof, neither of the
examples given are slow.

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nosy: +mrabarnett

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<http://bugs.python.org/issue1721518>
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