rust/src/test/run-pass/autobind.rs

fn f[T](x: &T[]) -> T { ret x.(0); }

fn g(act: fn(&int[]) -> int ) -> int { ret act(~[1, 2, 3]); }

fn main() {
    assert (g(f) == 1);
    let f1: fn(&str[]) -> str  = f;
    assert (f1(~["x", "y", "z"]) == "x");
}