Haven't seen any mention of it on this list yet, but since it's such an obvious flaw in quite a number of programming languages, here's a good article on the recent security bug in iOS, which was due to accidentally duplicated code not actually being as indented as it looked:
https://www.imperialviolet.org/2014/02/22/applebug.html Stefan -- https://mail.python.org/mailman/listinfo/python-list
