src/test/ui/macros/unknown-builtin.rs

   1 // error-pattern: attempted to define built-in macro more than once
   2
   3 #![feature(rustc_attrs)]
   4
   5 #[rustc_builtin_macro]
   6 macro_rules! unknown { () => () } //~ ERROR cannot find a built-in macro with name `unknown`
   7
   8 #[rustc_builtin_macro]
   9 macro_rules! line { () => () } //~ NOTE previously defined here
  10
  11 fn main() {
  12     line!();
  13     std::prelude::v1::line!();
  14 }