Function construct_error_impl

include/libremidi/system_error2.hpp:2278–2284

template <class E, class... Args>
constexpr auto construct_error_impl(
    is_convertible_to_error_using_traits<error_ctor_args<E>>,
    Args&&... args
    ) noexcept(noexcept(error_traits<E>::to_error(std::declval<Args&&>()...)))
{
  return error_traits<E>::to_error(std::forward<Args>(args)...);
}

template <class A1, class A2, class... Args>
constexpr auto construct_error_impl(