src/doc/unstable-book/src/language-features/match-beginning-vert.md

   1 # `match_beginning_vert`
   2
   3 The tracking issue for this feature is [#44101].
   4
   5 With this feature enabled, you are allowed to add a '|' to the beginning of a
   6 match arm:
   7
   8 ```rust
   9 #![feature(match_beginning_vert)]
  10
  11 enum Foo { A, B, C }
  12
  13 fn main() {
  14     let x = Foo::A;
  15     match x {
  16         | Foo::A
  17         | Foo::B => println!("AB"),
  18         | Foo::C => println!("C"),
  19     }
  20 }
  21 ```
  22
  23 [#44101]: https://github.com/rust-lang/rust/issues/44101