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1 | // Copyright 2015 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 | // See Issues #20055 and #21695. | |
12 | ||
13 | // We are checking here that the temporaries `Box<[i8, k]>`, for `k` | |
14 | // in 1, 2, 3, 4, that are induced by the match expression are | |
15 | // properly handled, in that only *one* will be initialized by | |
16 | // whichever arm is run, and subsequently dropped at the end of the | |
17 | // statement surrounding the `match`. | |
18 | ||
19 | trait Boo { | |
20 | fn dummy(&self) { } | |
21 | } | |
22 | ||
23 | impl Boo for [i8; 1] { } | |
24 | impl Boo for [i8; 2] { } | |
25 | impl Boo for [i8; 3] { } | |
26 | impl Boo for [i8; 4] { } | |
27 | ||
28 | pub fn foo(box_1: fn () -> Box<[i8; 1]>, | |
29 | box_2: fn () -> Box<[i8; 2]>, | |
30 | box_3: fn () -> Box<[i8; 3]>, | |
31 | box_4: fn () -> Box<[i8; 4]>, | |
32 | ) { | |
33 | println!("Hello World 1"); | |
34 | let _: Box<Boo> = match 3 { | |
35 | 1 => box_1(), | |
36 | 2 => box_2(), | |
37 | 3 => box_3(), | |
38 | _ => box_4(), | |
39 | }; | |
40 | println!("Hello World 2"); | |
41 | } | |
42 | ||
43 | pub fn main() { | |
44 | fn box_1() -> Box<[i8; 1]> { Box::new( [1; 1] ) } | |
45 | fn box_2() -> Box<[i8; 2]> { Box::new( [1; 2] ) } | |
46 | fn box_3() -> Box<[i8; 3]> { Box::new( [1; 3] ) } | |
47 | fn box_4() -> Box<[i8; 4]> { Box::new( [1; 4] ) } | |
48 | ||
49 | foo(box_1, box_2, box_3, box_4); | |
50 | } |