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
|
fn match_guards_still_work() {
match 0 {
0 if guard(0) => {},
_ => {},
}
}
fn other_guards_dont() {
match 0 {
(0 if guard(0)) => {},
//~^ ERROR unexpected parentheses surrounding `match` arm pattern
_ => {},
}
match 0 {
(0 if guard(0)) | 1 => {},
//~^ ERROR: guard patterns are experimental
_ => {},
}
let ((x if guard(x)) | x) = 0;
//~^ ERROR: guard patterns are experimental
//~| ERROR: cannot find value `x`
if let (x if guard(x)) = 0 {}
//~^ ERROR: guard patterns are experimental
//~| WARN: irrefutable
while let (x if guard(x)) = 0 {}
//~^ ERROR: guard patterns are experimental
//~| WARN: irrefutable
#[cfg(FALSE)]
while let (x if guard(x)) = 0 {}
//~^ ERROR: guard patterns are experimental
}
fn even_as_function_parameters(((x if guard(x), _) | (_, x)): (i32, i32)) {}
//~^ ERROR: guard patterns are experimental
//~| ERROR: cannot find value `x`
fn guard<T>(x: T) -> bool {
unimplemented!()
}
fn main() {}
|
