#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#[derive(Debug)]
struct MyCollection(Vec<i32>);
impl MyCollection {
    fn new() -> MyCollection {
        MyCollection(Vec::new())
    }
    fn add(&mut self, elem: i32) {
        self.0.push(elem);
    }
}
impl FromIterator<i32> for MyCollection {
    fn from_iter<I: IntoIterator<Item = i32>>(iter: I) -> Self {
        let mut c = MyCollection::new();
        for i in iter {
            c.add(i);
        }
        c
    }
}
fn main() {
    let iter = (0..5).into_iter();
    let c = MyCollection::from_iter(iter);
    assert_eq!(c.0, vec![0, 1, 2, 3, 4]);
    let iter = (0..5).into_iter();
    let c: MyCollection = iter.collect();
    assert_eq!(c.0, vec![0, 1, 2, 3, 4]);
}