src/test/run-pass/self-impl.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // Test that we can use `Self` types in impls in the expected way.
  12
  13 // pretty-expanded FIXME #23616
  14
  15 #![allow(unknown_features)]
  16 #![feature(box_syntax)]
  17
  18 struct Foo;
  19
  20 // Test uses on inherent impl.
  21 impl Foo {
  22     fn foo(_x: Self, _y: &Self, _z: Box<Self>) -> Self {
  23         Foo
  24     }
  25 }
  26
  27 // Test uses when implementing a trait and with a type parameter.
  28 pub struct Baz<X> {
  29     pub f: X,
  30 }
  31
  32 trait Bar<X> {
  33     fn bar(x: Self, y: &Self, z: Box<Self>) -> Self;
  34     fn dummy(&self, x: X) { }
  35 }
  36
  37 impl Bar<isize> for Box<Baz<isize>> {
  38     fn bar(_x: Self, _y: &Self, _z: Box<Self>) -> Self {
  39         box Baz { f: 42 }
  40     }
  41 }
  42
  43 fn main() {
  44     let _: Foo = Foo::foo(Foo, &Foo, box Foo);
  45     let _: Box<Baz<isize>> = Bar::bar(box Baz { f: 42 },
  46                                     &box Baz { f: 42 },
  47                                     box box Baz { f: 42 });
  48 }