scientific_names_lalrpop_sample.rs

//from scientific_names.lalrpop
// parse the final noun of a scientific name.
// match it to one of the legal final nouns.
pub FinalNoun : FinalNoun = {
   "kablooie"  => FinalNoun::Kablooie,
   "swoosh" => FinalNoun::Swoosh,
   "frobber" => FinalNoun::Frobber,
   "atomizer" => FinalNoun::Atomizer,
   "event"  => FinalNoun::Event,
   "device" => FinalNoun::Device,
};

// this is a simple enumerated type
// it's basically a list of legal values
// it derives from std traits that allow it to be 
// copied around and compared. 
#[derive(Debug, Copy, Clone, PartialEq)]
pub enum FinalNoun {
    Kablooie,
    Swoosh,
    Frobber,
    Atomizer,
    Event,
    Device
}