https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118328
Ken Jin <kenjin4096 at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |kenjin4096 at gmail dot com --- Comment #3 from Ken Jin <kenjin4096 at gmail dot com> --- Hi, I'm the OP in the CPython issue. I updated the PR to say that it is pure speculation on my part that GCC produces not-good-enough code without preserve_none. Sorry for the confusion. I don't have GCC trunk to test with musttail, but I'm happy to do so after I land that PR in CPython.