use std::rc::Rc;

#[derive(Debug /*/*, debug2::Debug*/*/, PartialEq)]

crate enum Tree {
    Leaf(Literal),
    Define(String, Box<Tree>),
    Set(String, Box<Tree>),
    If(Box<[Tree; 3]>),
    // Its easier to box the lambdas in the parser than the vm, as
    // here we see all of them exactly once
    Func(Rc<Func>),
    Branch(Vec<Tree>),
}

#[derive(Debug /*/*, debug2::Debug*/*/, PartialEq)]
crate struct Func {
    crate args: Vec<String>,
    crate body: Vec<Tree>,
}

#[derive(Debug /*/*, debug2::Debug*/*/, PartialEq)]

crate enum Literal {
    Sym(String),
    Num(f64),
    Bool(bool),
}