test.rs

#[feature(macro_registrar)]

extern mod syntax;

use syntax::ast::{Name};
use syntax::ext::base::{SyntaxExtension};

#[macro_registrar]
fn macro_registrar(register: |Name, SyntaxExtension|) {
    use syntax::ext::base::{SyntaxExpanderTTExpanderWithoutContext,NormalTT};
    use syntax::parse::token;
    let test = &'static |exp, span, token_tree, context| {
        use syntax::ext::base::{MacResult};
        MacResult::dummy_expr()
    };
    register(token::intern(&"test"),
             NormalTT(~SyntaxExpanderTTExpanderWithoutContext(cxx_call_expand)));
}

pub fn main() {

}

cxx_call_expand should be test of course ;)