/
issue-15571.rs
64 lines (59 loc) · 1.45 KB
/
issue-15571.rs
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
56
57
58
59
60
61
62
63
64
// Copyright 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.
fn match_on_local() {
let mut foo = Some(box 5i);
match foo {
None => {},
Some(x) => {
foo = Some(x);
}
}
println!("'{}'", foo.unwrap());
}
fn match_on_arg(mut foo: Option<Box<int>>) {
match foo {
None => {}
Some(x) => {
foo = Some(x);
}
}
println!("'{}'", foo.unwrap());
}
fn match_on_binding() {
match Some(box 7i) {
mut foo => {
match foo {
None => {},
Some(x) => {
foo = Some(x);
}
}
println!("'{}'", foo.unwrap());
}
}
}
fn match_on_upvar() {
let mut foo = Some(box 8i);
(proc() {
match foo {
None => {},
Some(x) => {
foo = Some(x);
}
}
println!("'{}'", foo.unwrap());
})();
}
fn main() {
match_on_local();
match_on_arg(Some(box 6i));
match_on_binding();
match_on_upvar();
}