File: macro-meta-items.rs

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rustc 1.88.0%2Bdfsg1-1
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//@ run-pass
//@ compile-flags: --cfg foo --check-cfg=cfg(foo)

#![allow(dead_code)]

macro_rules! compiles_fine {
    ($at:meta) => {
        #[cfg($at)]
        static MISTYPED: () = "foo";
    }
}
macro_rules! emit {
    ($at:meta) => {
        #[cfg($at)]
        static MISTYPED: &'static str = "foo";
    }
}

// item
compiles_fine!(FALSE);
emit!(foo);

fn foo() {
    println!("{}", MISTYPED);
}

pub fn main() {
    // statement
    compiles_fine!(FALSE);
    emit!(FALSE);
    println!("{}", MISTYPED);
}