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extern printf = (*i64, varargs) => i64; let main = () => i64 { let fib = (n: i64) => i64 { if n == 0 { return 0; }; if n == 1 { return 1; }; return fib(n-2) + fib(n-1); }; let result = fib(30); printf("%d", result); return result; };