nyavascript 0.1.0

Lisp implementation. Called NyavaScript because I'm a monster
Documentation 
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#[derive(Debug, Clone, PartialEq)]
pub enum Syntax {
    Dot(Option<Box<Syntax>>, Option<Box<Syntax>>),
    List(Vec<Syntax>),
    Number(isize),
    String(String),
    Symbol(String),
}

impl Syntax {
    pub fn list() -> Syntax {
        Syntax::List(Vec::new())
    }

    pub fn symbol(s: &str) -> Syntax {
        Syntax::Symbol(s.to_owned())
    }

    pub fn dot(car: Option<Syntax>, cdr: Option<Syntax>) -> Syntax {
        Syntax::Dot(
            car.map(|x| Box::new(x)),
            cdr.map(|x| Box::new(x)),
        )
    }

    pub fn string(s: &str) -> Syntax {
        Syntax::String(s.to_owned())
    }

    pub fn as_mut_list(&mut self) -> Option<&mut Vec<Syntax>> {
        match self {
            Syntax::List(l) => Some(l),
            _ => None,
        }
    }
}