1 fn iterate<T, F>(initial: T, f: F) -> Iterate<T, F> {
8 pub struct Iterate<T, F> {
13 impl<T: Clone, F> Iterator for Iterate<T, F> where F: Fn(&T) -> T {
17 fn next(&mut self) -> Option<Self::Item> {
18 self.state = (self.f)(&self.state);
19 Some(self.state.clone())
22 fn size_hint(&self) -> (usize, Option<usize>) { (usize::MAX, None) }
26 let a = iterate(0, |x| x+1);
27 println!("{:?}", a.iter().take(10).collect::<Vec<usize>>());
28 //~^ ERROR no method named `iter` found