blob: fca1c296dddcced2c13c988e9f4b27412e279ca7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
// Copyright 2013-2014 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.
// Tests that everything still compiles and runs fine even when
// we reorder the bounds.
trait A {
fn a(&self) -> usize;
}
trait B {
fn b(&self) -> usize;
}
trait C {
fn combine<T:A+B>(&self, t: &T) -> usize;
}
struct Foo;
impl A for Foo {
fn a(&self) -> usize { 1 }
}
impl B for Foo {
fn b(&self) -> usize { 2 }
}
struct Bar;
impl C for Bar {
// Note below: bounds in impl decl are in reverse order.
fn combine<T:B+A>(&self, t: &T) -> usize {
(t.a() * 100) + t.b()
}
}
fn use_c<S:C, T:B+A>(s: &S, t: &T) -> usize {
s.combine(t)
}
pub fn main() {
let foo = Foo;
let bar = Bar;
let r = use_c(&bar, &foo);
assert_eq!(r, 102);
}
|
