Function is_check

extlibs/sol3/include/sol/sol.hpp:10540–10542

		template <typename T>
		int is_check(lua_State* L) {
			return stack::push(L, stack::check<T>(L, 1, &no_panic));
		}

		template <typename T>
		int member_default_to_string(std::true_type, lua_State* L) {