src/test/ui/macros/meta-variable-misuse.rs

   1 // run-pass
   2 #![deny(meta_variable_misuse)]
   3
   4 macro_rules! foo {
   5     ($($m:ident $($f:ident $v:tt)+),*) => {
   6         $($(macro_rules! $f { () => { $v } })+)*
   7         $(macro_rules! $m { () => { $(fn $f() -> i32 { $v })+ } })*
   8     }
   9 }
  10
  11 foo!(m a 1 b 2, n c 3);
  12 m!();
  13 n!();
  14
  15 macro_rules! no_shadow {
  16     ($x:tt) => { macro_rules! bar { ($x:tt) => { 42 }; } };
  17 }
  18 no_shadow!(z);
  19
  20 macro_rules! make_plus {
  21     ($n: ident $x:expr) => { macro_rules! $n { ($y:expr) => { $x + $y }; } };
  22 }
  23 make_plus!(add3 3);
  24
  25 fn main() {
  26     assert_eq!(a!(), 1);
  27     assert_eq!(b!(), 2);
  28     assert_eq!(c!(), 3);
  29     assert_eq!(a(), 1);
  30     assert_eq!(b(), 2);
  31     assert_eq!(c(), 3);
  32     assert_eq!(bar!(z:tt), 42);
  33     assert_eq!(add3!(9), 12);
  34 }