I think that error message is somewhat misleading. You have to add #![feature(macro_rules)]
to your main crate module (note the exclamation sign), along with #![crate_id=...]
and others.
#![crate_id="rsfix#0.0"]
#![feature(macro_rules)]
macro_rules! example( ... )
fn main() {
example!(...);
}
This should work on the latest compiler version.