On Tue, Nov 27, 2012 at 09:17:57AM -0800, Guido van Rossum wrote: > Nevertheless the optimizer does crazy things to ceval.c. Trent, can you > confirm you were debugging unoptimized code? Yup, definitely. If it helps, I can fire up the dev env again and give specifics on the exact frame-jumping-voodoo that baffled me. Trent.