#[derive(Debug)]
enum TokenKind {
    LogicalAnd,
    LogicalOr,
    Error,
    Symbol,
}

fn consume_symbol(s: &str) -> TokenKind {
    match s {
        "&&" => TokenKind::LogicalAnd,
        "||" => TokenKind::LogicalOr,
        slice if itertools::any(slice.chars(), |ch| ch.is_digit(10)) => {
            TokenKind::Error
        },
        _ => TokenKind::Symbol,
    }
}

fn main() {
    println!("{:?}", consume_symbol("0"));
}