If you don't mind changing ntimes to not return a closure:
fn ntimes<T>(f: &fn(T) -> T, times: uint, x: T) -> T {
match times {
0u => x,
_ => ntimes(|x| f(x), times - 1u, f(x))
}
}
fn main() {
println(format!("{:d}", ntimes(|k| k*2, 2u, 3)));
}
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