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macro_rules! test ( ($nm:ident, $a:attr, $i:item) => (mod $nm { $a $i }); ) test!(a, #[cfg(qux)], pub fn bar() { }) test!(b, #[cfg(not(qux))], pub fn bar() { }) // test1!(#[bar]) #[qux] fn main() { a::bar(); //~ ERROR unresolved name `a::bar` b::bar(); }