#[derive(Debug, Clone, PartialEq)]
pub enum TokenKind {
    LParen,
    RParen,
    Arrow,
    Ident(String),
    Int(i64),
    I64(i64),
    U32(u32),
    U64(u64),
    Float(f64),
    String(String),
}

#[derive(Debug, Clone, PartialEq)]
pub struct Token {
    pub kind: TokenKind,
    pub span: Span,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct Span {
    pub start: usize,
    pub end: usize,
}

impl Span {
    pub fn new(start: usize, end: usize) -> Self {
        Self { start, end }
    }
}