rust/tests/ui/imports/issue-109148.rs

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// edition: 2021
// https://github.com/rust-lang/rust/pull/111761#issuecomment-1557777314
macro_rules! m {
() => {
extern crate core as std;
//~^ ERROR macro-expanded `extern crate` items cannot shadow names passed with `--extern`
}
}
m!();
use std::mem;
fn main() {}