rust/tests/ui/imports/multiple-extern-by-macro-for-underscore.rs

//@ edition: 2021

// issue#128813

extern crate core as _;

macro_rules! m {
    () => {
        extern crate std as _;
    };
}

m!();

fn main() {
    use ::_;
    //~^ ERROR: expected identifier, found reserved identifier `_`
}