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import "../../mod/libfwdio.so" fib(i64 n, (i64) res) { if n < 2 { res(1); } else { fib(n - 1) => i64 f1; fib(n - 2) => i64 f2; res(f1 + f2); } } main() { fib(20) => i64 n; if n == 10946 { fwdprint_str("OK\n"); } else { fwdprint_str("expected 10946, got "); fwdprint_i64(n); fwdprint_nl(); } }