gistfile1.txt

System:
rustc 0.11.0-pre-nightly (022a7b3 2014-05-22 01:06:25 -0700)
host: x86_64-apple-darwin

Error:
main.rs:14:2: 14:7 error: mismatched types: expected `Box A` but found `~B` (expected trait A but found box)
main.rs:14 	box B
           	^~~~~
error: aborting due to previous error

// -------------------- main.rs

trait A {
	fn do_stuff(&self);
}

struct B;

impl A for B {
	fn do_stuff(&self) {
		println!("Stuff.");
	}
}

fn new_a() -> Box<A> {
	box B
}

fn main() {
	let a = new_a();
	a.do_stuff();
}