--- /dev/null
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+struct X {
+ a: int
+}
+
+trait Changer {
+ fn change(mut self) -> Self;
+}
+
+impl Changer for X {
+ fn change(mut self) -> X {
+ self.a = 55;
+ self
+ }
+}
+
+pub fn main() {
+ let x = X { a: 32 };
+ let new_x = x.change();
+ assert_eq!(new_x.a, 55);
+}
--- /dev/null
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+struct X {
+ a: int
+}
+
+trait Changer {
+ fn change(mut self) -> Self {
+ self.set_to(55);
+ self
+ }
+
+ fn change_again(mut ~self) -> ~Self {
+ self.set_to(45);
+ self
+ }
+
+ fn set_to(&mut self, a: int);
+}
+
+impl Changer for X {
+ fn set_to(&mut self, a: int) {
+ self.a = a;
+ }
+}
+
+pub fn main() {
+ let x = X { a: 32 };
+ let new_x = x.change();
+ assert_eq!(new_x.a, 55);
+
+ let x = ~new_x;
+ let new_x = x.change_again();
+ assert_eq!(new_x.a, 45);
+}
--- /dev/null
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+struct X {
+ a: int
+}
+
+trait Changer {
+ fn change(mut ~self) -> ~Self;
+}
+
+impl Changer for X {
+ fn change(mut ~self) -> ~X {
+ self.a = 55;
+ self
+ }
+}
+
+pub fn main() {
+ let x = ~X { a: 32 };
+ let new_x = x.change();
+ assert_eq!(new_x.a, 55);
+}