File: duplicate-builtin.rs

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// compile-flags:--crate-type lib
#![feature(decl_macro)]
#![feature(rustc_attrs)]

#[rustc_builtin_macro]
pub macro test($item:item) {
//~^ NOTE previously defined
    /* compiler built-in */
}

mod inner {
    #[rustc_builtin_macro]
    pub macro test($item:item) {
    //~^ ERROR attempted to define built-in macro more than once [E0773]
        /* compiler built-in */
    }
}