dfhoughton

// macro for converting a declarative expression such as
// grammar!{
//     (?bBw)
//     larry => <bob>{5} | <bar>{3,}
//     larry -> ("this")? <bar>* ("that") <bob>+
//     bob   => r("foo")
//     bar   => (?i) [&v]
// };
// into a pidgin::Grammar
//