| // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| |
| macro_rules! mypat { |
| () => ( |
| Some('y') |
| ) |
| } |
| |
| macro_rules! char_x { |
| () => ( |
| 'x' |
| ) |
| } |
| |
| macro_rules! some { |
| ($x:pat) => ( |
| Some($x) |
| ) |
| } |
| |
| macro_rules! indirect { |
| () => ( |
| some!(char_x!()) |
| ) |
| } |
| |
| macro_rules! ident_pat { |
| ($x:ident) => ( |
| $x |
| ) |
| } |
| |
| fn f(c: Option<char>) -> usize { |
| match c { |
| Some('x') => 1, |
| mypat!() => 2, |
| _ => 3, |
| } |
| } |
| |
| pub fn main() { |
| assert_eq!(1, f(Some('x'))); |
| assert_eq!(2, f(Some('y'))); |
| assert_eq!(3, f(None)); |
| |
| assert_eq!(1, match Some('x') { |
| Some(char_x!()) => 1, |
| _ => 2, |
| }); |
| |
| assert_eq!(1, match Some('x') { |
| some!(char_x!()) => 1, |
| _ => 2, |
| }); |
| |
| assert_eq!(1, match Some('x') { |
| indirect!() => 1, |
| _ => 2, |
| }); |
| |
| assert_eq!(3, { |
| let ident_pat!(x) = 2; |
| x+1 |
| }); |
| } |