#![feature(decl_macro)]

mod foo {
    pub macro import_bar($name:ident) {
        use bar::time_travel as $name;
    }
}

mod bar {
    pub macro time_travel($name:ident) {
        use foo::import_bar as $name;
    }
}

use foo::*;

import_bar!(m2);
m2!(import_bar);