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
65
66
67
68
69
70
71
72
73
74
75
|
// run-pass
#![allow(non_camel_case_types)]
#![allow(dead_code)]
// compile-flags: --edition 2018
#![feature(try_blocks)]
struct catch {}
pub fn main() {
let catch_result: Option<_> = try {
let x = 5;
x
};
assert_eq!(catch_result, Some(5));
let mut catch = true;
while catch { catch = false; }
assert_eq!(catch, false);
catch = if catch { false } else { true };
assert_eq!(catch, true);
match catch {
_ => {}
};
let catch_err: Result<_, i32> = try {
Err(22)?;
1
};
assert_eq!(catch_err, Err(22));
let catch_okay: Result<i32, i32> = try {
if false { Err(25)?; }
Ok::<(), i32>(())?;
28
};
assert_eq!(catch_okay, Ok(28));
let catch_from_loop: Result<i32, i32> = try {
for i in 0..10 {
if i < 5 { Ok::<i32, i32>(i)?; } else { Err(i)?; }
}
22
};
assert_eq!(catch_from_loop, Err(5));
let cfg_init;
let _res: Result<(), ()> = try {
cfg_init = 5;
};
assert_eq!(cfg_init, 5);
let cfg_init_2;
let _res: Result<(), ()> = try {
cfg_init_2 = 6;
Err(())?;
};
assert_eq!(cfg_init_2, 6);
let my_string = "test".to_string();
let res: Result<&str, ()> = try {
// Unfortunately, deref doesn't fire here (#49356)
&my_string[..]
};
assert_eq!(res, Ok("test"));
let my_opt: Option<_> = try { () };
assert_eq!(my_opt, Some(()));
let my_opt: Option<_> = try { };
assert_eq!(my_opt, Some(()));
}
|
