src/test/ui/hygiene/macro-metavars-legacy.rs

   1 // Ensure macro metavariables are compared with legacy hygiene
   2
   3 #![feature(rustc_attrs)]
   4
   5 // run-pass
   6
   7 macro_rules! make_mac {
   8     ( $($dollar:tt $arg:ident),+ ) => {
   9         macro_rules! mac {
  10             ( $($dollar $arg : ident),+ ) => {
  11                 $( $dollar $arg )-+
  12             }
  13         }
  14     }
  15 }
  16
  17 macro_rules! show_hygiene {
  18     ( $dollar:tt $arg:ident ) => {
  19         make_mac!($dollar $arg, $dollar arg);
  20     }
  21 }
  22
  23 show_hygiene!( $arg );
  24
  25 fn main() {
  26     let x = 5;
  27     let y = 3;
  28     assert_eq!(2, mac!(x, y));
  29 }