-
Notifications
You must be signed in to change notification settings - Fork 30
/
macro-pat-pattern-followed-by-or.rs
47 lines (45 loc) · 1.15 KB
/
macro-pat-pattern-followed-by-or.rs
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
//@ run-pass
#![allow(unused_macros)]
macro_rules! foo { ($x:pat | $y:pat) => {} } // should be ok
macro_rules! bar { ($($x:pat)+ | $($y:pat)+) => {} } // should be ok
macro_rules! qux { ($x:pat, $y:pat) => {} } // should be ok
macro_rules! match_any {
( $expr:expr , $( $( $pat:pat )|+ => $expr_arm:expr ),+ ) => { // should be ok
match $expr {
$(
$( $pat => $expr_arm, )+
)+
}
};
}
fn main() {
let result: Result<i64, i32> = Err(42);
let int: i64 = match_any!(result, Ok(i) | Err(i) => i.into());
assert_eq!(int, 42);
}
// ferrocene-annotations: fls_xa7lp0zg1ol2
// Declarative Macros
//
// ferrocene-annotations: fls_wjldgtio5o75
// Macro Expansion
//
// ferrocene-annotations: fls_vnvt40pa48n8
// Macro Invocation
//
// ferrocene-annotations: fls_4apk1exafxii
// Macro Matching
//
// ferrocene-annotations: fls_ym00b6ewf4n3
// Macro Transcription
//
// ferrocene-annotations: fls_8nzypdu9j3ge
// Metavariables
//
// ferrocene-annotations: fls_k01lsksqtq1r
// Repetition
//
// ferrocene-annotations: fls_n3ktmjqf87qb
// Rule Matching
//
// ferrocene-annotations: fls_qpx6lgapce57
// Token Matching