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
|
// run-pass
#![feature(never_type, never_type_fallback)]
#![feature(exhaustive_patterns)]
#![allow(unreachable_patterns)]
#![allow(unreachable_code)]
#![allow(unused_variables)]
#[allow(dead_code)]
fn foo(z: !) {
let x: Result<!, !> = Ok(z);
let Ok(_y) = x;
let Err(_y) = x;
let x = [z; 1];
match x {};
match x {
[q] => q,
};
}
fn bar(nevers: &[!]) {
match nevers {
&[] => (),
};
match nevers {
&[] => (),
&[_] => (),
&[_, _, _, ..] => (),
};
}
fn main() {
let x: Result<u32, !> = Ok(123);
let Ok(y) = x;
assert_eq!(123, y);
match x {
Ok(y) => y,
};
match x {
Ok(y) => y,
Err(e) => match e {},
};
let x: Result<u32, &!> = Ok(123);
match x {
Ok(y) => y,
Err(_) => unimplemented!(),
};
bar(&[]);
}
|
