This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 115e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2024-11-11
According to 9.2.6 [dcl.constexpr] paragraph 6,
If no specialization of the template would satisfy the requirements for a constexpr function or constexpr constructor when considered as a non-template function or constructor, the template is ill-formed; no diagnostic required.
This should say “instantiated template specialization” instead of just “specialization” to clarify that an explicit specialization is not in view here.