2014-10-17 08:13:12 -05:00
|
|
|
// Copyright 2012 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.
|
|
|
|
|
|
|
|
// Test that we pick which version of `Foo` to run based on whether
|
|
|
|
// the type we (ultimately) inferred for `x` is copyable or not.
|
|
|
|
//
|
|
|
|
// In this case, the two versions are both impls of same trait, and
|
|
|
|
// hence we we can resolve method even without knowing yet which
|
|
|
|
// version will run (note that the `push` occurs after the call to
|
|
|
|
// `foo()`).
|
|
|
|
|
2015-01-07 19:25:56 -06:00
|
|
|
#![allow(unknown_features)]
|
|
|
|
#![feature(box_syntax)]
|
|
|
|
|
2014-10-17 08:13:12 -05:00
|
|
|
trait Foo {
|
|
|
|
fn foo(&self) -> int;
|
|
|
|
}
|
|
|
|
|
|
|
|
impl<T:Copy> Foo for Vec<T> {
|
|
|
|
fn foo(&self) -> int {1}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl<T> Foo for Vec<Box<T>> {
|
|
|
|
fn foo(&self) -> int {2}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn call_foo_copy() -> int {
|
|
|
|
let mut x = Vec::new();
|
|
|
|
let y = x.foo();
|
2015-02-18 04:42:01 -06:00
|
|
|
x.push(0_usize);
|
2014-10-17 08:13:12 -05:00
|
|
|
y
|
|
|
|
}
|
|
|
|
|
|
|
|
fn call_foo_other() -> int {
|
2015-02-17 14:41:32 -06:00
|
|
|
let mut x: Vec<Box<_>> = Vec::new();
|
2014-10-17 08:13:12 -05:00
|
|
|
let y = x.foo();
|
2015-01-25 15:05:03 -06:00
|
|
|
x.push(box 0);
|
2014-10-17 08:13:12 -05:00
|
|
|
y
|
|
|
|
}
|
|
|
|
|
|
|
|
fn main() {
|
|
|
|
assert_eq!(call_foo_copy(), 1);
|
|
|
|
assert_eq!(call_foo_other(), 2);
|
|
|
|
}
|