On 2012-03-26 07:10, David Reiser wrote: > I get the test_set_clear failure in Mac OS X 10.7.3 x86_64 using clang > 3.1 even with -O0. So I finally got to the bottom of this. It looks like I was relying on undefined GCC behavior, or something like that. I pushed a fix to git master, and will do a new release soon. Cheers, Stef