/* heh, this technically speaking would work but the templating turns out to be
 * too much for both GCC and clang. With some manual intervention on the
 * generated code I can get fibonacci numbers up to about 35 to work, but then
 * I run out of stack space. I guess the compiler can't collapse frames so the
 * bifurcating nature of fibonacci just gets mapped to a linear sequence of
 * calls? */

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

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