File: guards.rs

package info (click to toggle)
rustc 1.88.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 934,128 kB
  • sloc: xml: 158,127; python: 36,062; javascript: 19,855; sh: 19,700; cpp: 18,947; ansic: 12,993; asm: 4,792; makefile: 690; lisp: 29; perl: 29; ruby: 19; sql: 11
file content (21 lines) | stat: -rw-r--r-- 422 bytes parent folder | download | duplicates (15) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 
#![deny(unreachable_patterns)]

enum Q { R(Option<usize>) }

pub fn main() {
    match Q::R(None) {
        Q::R(S) if S.is_some() => {}
        _ => {}
    }

    match 0u8 { //~ ERROR non-exhaustive patterns
        0 .. 128 => {}
        128 ..= 255 if true => {}
    }

    match 0u8 {
        0 .. 128 => {}
        128 ..= 255 if false => {}
        128 ..= 255 => {} // ok, because previous arm was guarded
    }
}