# `match_beginning_vert`

The tracking issue for this feature is #44101.

With this feature enabled, you are allowed to add a '|' to the beginning of a match arm:

    #![feature(match_beginning_vert)]

    enum Foo { A, B, C }

    fn main() {
        let x = Foo::A;
        match x {
            | Foo::A
            | Foo::B => println!("AB"),
            | Foo::C => println!("C"),
        }
    }