//@ run-pass | |
#![allow(non_camel_case_types)] | |
trait double { | |
fn double(self) -> usize; | |
} | |
impl double for usize { | |
fn double(self) -> usize { self } | |
} | |
impl double for Box<usize> { | |
fn double(self) -> usize { *self * 2 } | |
} | |
pub fn main() { | |
let x: Box<_> = Box::new(3); | |
assert_eq!(x.double(), 6); | |
} |