https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114018
--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Ah, it is described in https://eel.is/c++draft/cmath.syn#2 and probably due to https://eel.is/c++draft/cmath.syn#3 (so that one can use std::nexttoward(42, 53.0L); as it has just one floating-point-type argument, there is no template for promotion of args for nexttoward). Perhaps constexpr standard-floating-point-type nexttoward(standard-floating-point-type x, long double y); and define standard-floating-point meaning in [cmath.syn]/2 and talk about it also in [cmath.syn]/3?
