"Method arguments must match example 1"

ref struct SpanWrapper {
	public Span<int> IntSpan;
}

static void Test() {
	Span<int> heapSpan = new[] { 1, 2, 3 };
	Span<int> stackSpan = stackalloc[] { 4, 5, 6 };
	var wrapper = new SpanWrapper {
		IntSpan = heapSpan
	};

	Console.WriteLine(LengthMatches(ref wrapper, stackSpan)); // Fails to compile here
}

static bool LengthMatches(ref SpanWrapper wrapper, Span<int> comparand) {
	return wrapper.IntSpan.Length == comparand.Length;
}