from typing import Any

from core.exceptions import syntaxError
# from core.printer import Representation

class LinkedList:
    value = None
    nxt = None

    def __init__(self, value_, nxt_):
        self.value = value_
        self.nxt = nxt_

def car(lst):
    return lst.value

def cdr(lst):
    return lst.nxt

def cons(val, lst):
    return LinkedList(val, lst)

def isList(val):
    return isinstance(val, LinkedList)

NIL = cons(None, None)