TokenKind :: enum {
    if
    else
    for
    while
    func
    return

    ident
    int
    float
    string

    equal
    double_colon

    open_paren
    close_paren
    open_curly
    close_curly

    newline

    invalid
    eof
}

Token :: struct {
    kind TokenKind
    start int
}