//@ run-pass #![allow(incomplete_features)] #![feature(unsized_locals)] pub trait Foo { fn foo(self) -> String; } struct A; impl Foo for A { fn foo(self) -> String { format!("hello") } } fn main() { let x = *(Box::new(A) as Box); assert_eq!(x.foo(), format!("hello")); // I'm not sure whether we want this to work let x = Box::new(A) as Box; assert_eq!(x.foo(), format!("hello")); }