Function equal

tests/runtime/lists/test.cpp:11–13

template <class T, class S>
static bool equal(T const&a, S const& b) {
    return a == b;
}
template<class R, class S>
static bool equal(std::span<R> const&a, std::span<S> const& b) {
    if (a.size() != b.size()) { return false; }