public static int Sum(Stack <int> intStack)
{
var recursiveTailSum = Trampoline.MakeTrampoline((int acc, Stack <int> ints) =>
{
var topInt = ints.Pop();
var total = topInt + acc;
return(ints.Any()
? Trampoline.Recurse <int, Stack <int>, int>(total, ints)
: Trampoline.ReturnResult <int, Stack <int>, int>(total));
});
return(recursiveTailSum(0, intStack));
}
