1 // Test that duplicate matcher binding names are caught at declaration time, rather than at macro 2 // invocation time. 3 4 #![allow(unused_macros)] 5 6 macro_rules! foo1 { 7 ($a:ident, $a:ident) => {}; //~ERROR duplicate matcher binding 8 ($a:ident, $a:path) => {}; //~ERROR duplicate matcher binding 9 } 10 11 macro_rules! foo2 { 12 ($a:ident) => {}; // OK 13 ($a:path) => {}; // OK 14 } 15 16 macro_rules! foo3 { 17 ($a:ident, $($a:ident),*) => {}; //~ERROR duplicate matcher binding 18 ($($a:ident)+ # $($($a:path),+);*) => {}; //~ERROR duplicate matcher binding 19 } 20 main()21fn main() {} 22