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1 | // Copyright 2017 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 | // compile-flags: -Z identify_regions -Z span_free_formats | |
12 | // ignore-tidy-linelength | |
13 | ||
14 | // This test models a scenario that arielb1 found during review. | |
15 | // Namely, any filtering of EndRegions must ensure to continue to emit | |
16 | // any necessary EndRegions that occur earlier in the source than the | |
17 | // first borrow involving that region. | |
18 | // | |
19 | // It is tricky to actually construct examples of this, which is the | |
20 | // main reason that I am keeping this test even though I have now | |
21 | // removed the pre-filter that motivated the test in the first place. | |
22 | ||
23 | fn main() { | |
24 | let mut second_iter = false; | |
25 | let x = 3; | |
26 | 'a: loop { | |
27 | let mut y; | |
28 | loop { | |
29 | if second_iter { | |
30 | break 'a; // want to generate `EndRegion('a)` here | |
31 | } else { | |
32 | y = &/*'a*/ x; | |
33 | } | |
34 | second_iter = true; | |
35 | } | |
36 | } | |
37 | } | |
38 | ||
39 | // END RUST SOURCE | |
40 | // START rustc.node4.SimplifyCfg-qualify-consts.after.mir | |
41 | // fn main() -> () { | |
42 | // let mut _0: (); | |
43 | // let mut _1: bool; | |
44 | // let _2: i32; | |
45 | // let mut _4: &'13_0rce i32; | |
46 | // let mut _3: (); | |
47 | // let mut _5: !; | |
48 | // let mut _6: (); | |
49 | // let mut _7: bool; | |
50 | // let mut _8: !; | |
51 | // | |
52 | // bb0: { | |
53 | // StorageLive(_1); | |
54 | // _1 = const false; | |
55 | // StorageLive(_2); | |
56 | // _2 = const 3i32; | |
57 | // StorageLive(_4); | |
58 | // goto -> bb1; | |
59 | // } | |
60 | // | |
61 | // bb1: { | |
62 | // StorageLive(_7); | |
63 | // _7 = _1; | |
64 | // switchInt(_7) -> [0u8: bb3, otherwise: bb2]; | |
65 | // } | |
66 | // | |
67 | // bb2: { | |
68 | // _0 = (); | |
69 | // StorageDead(_7); | |
70 | // StorageDead(_4); | |
71 | // EndRegion('13_0rce); | |
72 | // StorageDead(_2); | |
73 | // StorageDead(_1); | |
74 | // return; | |
75 | // } | |
76 | // | |
77 | // bb3: { | |
78 | // _4 = &'13_0rce _2; | |
79 | // _6 = (); | |
80 | // StorageDead(_7); | |
81 | // _1 = const true; | |
82 | // _3 = (); | |
83 | // goto -> bb1; | |
84 | // } | |
85 | // } |