[rustc.git] / src / test / ui / issues / issue-41880.rs

fn iterate<T, F>(initial: T, f: F) -> Iterate<T, F> {
    Iterate {
        state: initial,
        f: f,
    }
}

pub struct Iterate<T, F> {
    state: T,
    f: F
}

impl<T: Clone, F> Iterator for Iterate<T, F> where F: Fn(&T) -> T {
    type Item = T;

    #[inline]
    fn next(&mut self) -> Option<Self::Item> {
        self.state = (self.f)(&self.state);
        Some(self.state.clone())
    }
    #[inline]
    fn size_hint(&self) -> (usize, Option<usize>) { (usize::MAX, None) }
}

fn main() {
    let a = iterate(0, |x| x+1);
    println!("{:?}", a.iter().take(10).collect::<Vec<usize>>());
    //~^ ERROR no method named `iter` found
}
Commit	Line	Data
ff7c6d11 XL	1	fn iterate<T, F>(initial: T, f: F) -> Iterate<T, F> {
	2	Iterate {
	3	state: initial,
	4	f: f,
	5	}
	6	}
	7
	8	pub struct Iterate<T, F> {
	9	state: T,
	10	f: F
	11	}
	12
	13	impl<T: Clone, F> Iterator for Iterate<T, F> where F: Fn(&T) -> T {
	14	type Item = T;
	15
	16	#[inline]
	17	fn next(&mut self) -> Option<Self::Item> {
	18	self.state = (self.f)(&self.state);
	19	Some(self.state.clone())
	20	}
	21	#[inline]
fc512014	22	fn size_hint(&self) -> (usize, Option<usize>) { (usize::MAX, None) }
ff7c6d11 XL	23	}
	24
	25	fn main() {
	26	let a = iterate(0, \|x\| x+1);
	27	println!("{:?}", a.iter().take(10).collect::<Vec<usize>>());
dfeec247	28	//~^ ERROR no method named `iter` found
ff7c6d11	29	}