tests/ui/macros/rfc-3086-metavar-expr/dollar-dollar-has-correct-behavior.rs

   1 // run-pass
   2
   3 #![feature(macro_metavar_expr)]
   4
   5 macro_rules! nested {
   6     ( $a:ident ) => {
   7         macro_rules! $a {
   8             ( $$( $b:ident ),* ) => {
   9                 $$(
  10                     macro_rules! $b {
  11                         ( $$$$( $c:ident ),* ) => {
  12                             $$$$(
  13                                 fn $c() -> &'static str { stringify!($c) }
  14                             ),*
  15                         };
  16                     }
  17                 )*
  18             };
  19         }
  20     };
  21 }
  22
  23 fn main() {
  24     nested!(a);
  25     a!(b);
  26     b!(c);
  27     assert_eq!(c(), "c");
  28 }