#[derive(Debug, PartialEq, Clone)]
pub enum Expr {
    LNull,
    LBool(bool),
    LStr(String),
    LNum(f64),
    Var(Identifier),
    Binary(BinOp, Box<Expr>, Box<Expr>),
    Call(Identifier, Vec<Expr>),
    Receive(Box<Expr>),
}

pub type Identifier = String;

#[derive(Debug, PartialEq, Clone)]
pub enum BinOp {
    Plus,
    Minus,
    Mult,
    Div,
    Equals,
    NotEquals,
    LessThan,
    GreaterThan,
}

#[derive(Debug, PartialEq, Clone)]
pub enum Stmt {
    Expr(Expr),
    Let(Identifier, Expr),
    Assign(Identifier, Expr),
    If(Expr, Vec<Stmt>),
    While(Expr, Vec<Stmt>),
    Func(Identifier, Vec<Identifier>, Vec<Stmt>),
    Return(Option<Expr>),
    Yield,
    Spawn(Expr),
    Send(Expr, Identifier),
}