#![feature(rustc_attrs)] macro_rules! test { ($nm:ident, #[$a:meta], $i:item) => (mod $nm { #![$a] $i }); } test!(a, #[cfg(FALSE)], pub fn bar() { }); test!(b, #[cfg(not(FALSE))], pub fn bar() { }); #[rustc_dummy] fn main() { a::bar(); //~^ ERROR failed to resolve: use of undeclared crate or module `a` b::bar(); }