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fn f<T: copy>(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");
}
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