#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(result_option_map_or_default)]
fn main() {
    let x: Result<_, &str> = Ok("foo");
    let y: Result<&str, _> = Err("bar");
    assert_eq!(x.map_or_default(| x | x.len()), 3);
    assert_eq!(y.map_or_default(| y | y.len()), 0);
}