File: macro-pat-follow.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, sid, trixie
  • size: 893,396 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,051; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (21 lines) | stat: -rw-r--r-- 375 bytes parent folder | download | duplicates (5) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 
//@ run-pass
macro_rules! pat_in {
    ($p:pat in $e:expr) => {{
        let mut iter = $e.into_iter();
        while let $p = iter.next() {}
    }};
}

macro_rules! pat_if {
    ($p:pat if $e:expr) => {{
        match Some(1u8) {
            $p if $e => {}
            _ => {}
        }
    }};
}

fn main() {
    pat_in!(Some(_) in 0..10);
    pat_if!(Some(x) if x > 0);
}