or_reducer.rs

pub fn reduce_or(stack: &mut Vec<Token>) -> Result<Token, RuntimeError> {
    // would return Err if the vector were not entirely
    // made of Token::Operand(Type::Bool), since we can't reduce with `or`
    // other values
    let bool_result = unwrap_boolean_tokens(stack);
    if let Ok(bool_vec) = bool_result {
        Ok(Token::Operand(Type::Bool(
            bool_vec.iter().any(|b| *b) // and reducer has "all" here
        )))
    } else {
        Err(RuntimeError{ })
    }
}