The signature of nexttoward was incorrectly changed by [P1467](https://wg21.link/P1467). The second parameter should be long double, not floating-point-type. Proposed change: Modify the declaration of nexttoward in 28.7.1 [cmath.syn] as follows: ``` constexpr floating-point-type nexttoward(floating-point-type x, floating-point-type**long double** y); ```