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// run-pass
#![allow(non_camel_case_types)]
trait vec_utils<T> {
fn map_<U, F>(x: &Self, f: F) -> Vec<U> where F: FnMut(&T) -> U;
}
impl<T> vec_utils<T> for Vec<T> {
fn map_<U, F>(x: &Vec<T> , mut f: F) -> Vec<U> where F: FnMut(&T) -> U {
let mut r = Vec::new();
for elt in x {
r.push(f(elt));
}
r
}
}
pub fn main() {
assert_eq!(vec_utils::map_(&vec![1,2,3], |&x| x+1), [2,3,4]);
}
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