https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91486
--- Comment #10 from Mike Crowe <mac at mcrowe dot com> --- Unfortunately https://gcc.gnu.org/g:f9ddb696a289cc48d24d3d23c0b324cb88de9573 mentioned in comment 9 contains a small bug (all my fault) that Jonathan pointed out in https://gcc.gnu.org/pipermail/libstdc++/2020-September/051004.html . I've posted a fix in https://gcc.gnu.org/pipermail/libstdc++/2020-September/051025.html and I'll attach the patch here too.
