/* heh, this technically speaking works, but I guess the compiler can't collapse
 * frames so the bifurcating nature of fibonacci just gets mapped to a linear
 * sequence of calls, taking up way more stack space than a typical, returning,
 * function  */

fib(int n, (int) res)
{
	fwd_copy(n) => int n1, int n2;
	if n1 < 2 {
		res(1);
	} else {
		fwd_copy(n2) => int n3, int n4;
		fib(n3 - 1) => int f1;
		fib(n4 - 2) => int f2;
		res(f1 + f2);
	}
}

/* 'extern' println */
fwd_println(auto n);
fwd_copy(auto n, (auto, auto) n1);

main()
{
	fib(6) => int n;
	fwd_println(n);
}