| // Copyright 2018 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! foo { |
| ($a:ident, $b:ident) => () |
| } |
| |
| fn main() { |
| println!("{}" a); |
| //~^ ERROR expected token: `,` |
| foo!(a b); |
| //~^ ERROR no rules expected the token `b` |
| } |
