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// run-pass
trait Foo {
fn foo(&self) -> String;
}
impl<T:Foo> Foo for Box<T> {
fn foo(&self) -> String {
format!("box {}", (**self).foo())
}
}
impl Foo for usize {
fn foo(&self) -> String {
format!("{}", *self)
}
}
pub fn main() {
let x: Box<_> = Box::new(3);
assert_eq!(x.foo(), "box 3".to_string());
}
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