| //@ error-pattern: attempted to define built-in macro more than once | |
| #![feature(rustc_attrs)] | |
| #[rustc_builtin_macro] | |
| macro_rules! unknown { () => () } //~ ERROR cannot find a built-in macro with name `unknown` | |
| #[rustc_builtin_macro] | |
| macro_rules! line { () => () } //~ NOTE previously defined here | |
| fn main() { | |
| line!(); | |
| std::prelude::v1::line!(); | |
| } |