or_patterns

The tracking issue for this feature is: #54883

The or_pattern language feature allows | to be arbitrarily nested within a pattern, for example, Some(A(0) | B(1 | 2)) becomes a valid pattern.

Examples

#![feature(or_patterns)]

pub enum Foo {
    Bar,
    Baz,
    Quux,
}

pub fn example(maybe_foo: Option<Foo>) {
    match maybe_foo {
        Some(Foo::Bar | Foo::Baz) => {
            println!("The value contained `Bar` or `Baz`");
        }
        Some(_) => {
            println!("The value did not contain `Bar` or `Baz`");
        }
        None => {
            println!("The value was `None`");
        }
    }
}