tree b30aa272a3660c07c56c15dcd65be48d6d974a7c
parent 632d692e296bfe980e2b1ba233d168135f3de5f4
author Raymond Hettinger <python@rcn.com> 1431399625 -0700
committer Raymond Hettinger <python@rcn.com> 1431399625 -0700

Defend against a mutation during comparison