https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78929
--- Comment #2 from Ryou Ezoe <boostcpp at gmail dot com> --- My bad. ยง1.10 p18 still said "i++ + i" is undefined.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78929
--- Comment #2 from Ryou Ezoe <boostcpp at gmail dot com> --- My bad. ยง1.10 p18 still said "i++ + i" is undefined.