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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 | #![allow(unknown_features)] | |
12 | #![feature(box_syntax)] | |
13 | ||
14 | fn match_on_local() { | |
c34b1796 | 15 | let mut foo: Option<Box<_>> = Some(box 5); |
1a4d82fc JJ |
16 | match foo { |
17 | None => {}, | |
18 | Some(x) => { | |
19 | foo = Some(x); | |
20 | } | |
21 | } | |
22 | println!("'{}'", foo.unwrap()); | |
23 | } | |
24 | ||
85aaf69f | 25 | fn match_on_arg(mut foo: Option<Box<i32>>) { |
1a4d82fc JJ |
26 | match foo { |
27 | None => {} | |
28 | Some(x) => { | |
29 | foo = Some(x); | |
30 | } | |
31 | } | |
32 | println!("'{}'", foo.unwrap()); | |
33 | } | |
34 | ||
35 | fn match_on_binding() { | |
c34b1796 | 36 | match Some(Box::new(7)) { |
1a4d82fc JJ |
37 | mut foo => { |
38 | match foo { | |
39 | None => {}, | |
40 | Some(x) => { | |
41 | foo = Some(x); | |
42 | } | |
43 | } | |
44 | println!("'{}'", foo.unwrap()); | |
45 | } | |
46 | } | |
47 | } | |
48 | ||
49 | fn match_on_upvar() { | |
c34b1796 | 50 | let mut foo: Option<Box<_>> = Some(box 8); |
85aaf69f | 51 | let f = move|| { |
1a4d82fc JJ |
52 | match foo { |
53 | None => {}, | |
54 | Some(x) => { | |
55 | foo = Some(x); | |
56 | } | |
57 | } | |
58 | println!("'{}'", foo.unwrap()); | |
59 | }; | |
60 | f(); | |
61 | } | |
62 | ||
63 | fn main() { | |
64 | match_on_local(); | |
85aaf69f | 65 | match_on_arg(Some(box 6)); |
1a4d82fc JJ |
66 | match_on_binding(); |
67 | match_on_upvar(); | |
68 | } |