Static rustc_ap_rustc_lint_defs::builtin::OR_PATTERNS_BACK_COMPAT

pub static OR_PATTERNS_BACK_COMPAT: &Lint

The or_patterns_back_compat lint detects usage of old versions of or-patterns.

Example

#![deny(or_patterns_back_compat)]
macro_rules! match_any {
    ( $expr:expr , $( $( $pat:pat )|+ => $expr_arm:expr ),+ ) => {
        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);
}

{{produces}}

Explanation

In Rust 2021, the pat matcher will match new patterns, which include the | character.