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