sample/fib_9.in


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// Fibonacci number

// Rules
fib(ret) >< (int n)
| n == 0 => ret~0
| n == 1 => ret~1
| _ => fib(cnt1)~(n-1), fib(cnt2)~(n-2), Add(ret, cnt2)~cnt1;


// Note: Add is implemented as a built-in agent such that:
//   Add(ret, int m) ~ (int n) --> ret~(n+m);

// Nets
fib(ret)~9;
ret;