File: macro-pat-follow.rs

package info (click to toggle)
rustc-web 1.78.0%2Bdfsg1-2~deb12u3
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,245,420 kB
  • sloc: xml: 147,985; javascript: 18,022; sh: 11,083; python: 10,265; ansic: 6,172; cpp: 5,023; asm: 4,390; makefile: 4,269
file content (21 lines) | stat: -rw-r--r-- 375 bytes parent folder | download | duplicates (6)
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);
}