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