def __init__(self, first, rest):
from scheme_builtins import scheme_valid_cdrp, SchemeError
if not (rest is nil or isinstance(rest, Pair) or type(rest).__name__ == 'Promise'):
print(rest, type(rest).__name__)
raise SchemeError("cdr can only be a pair, nil, or a promise but was {}".format(rest))
self.first = first
self.rest = rest
def __init__(self, first, rest):
from scheme_builtins import scheme_valid_cdrp, SchemeError
if not scheme_valid_cdrp(rest):
raise SchemeError(
"cdr can only be a pair, nil, or a promise but was {}".format(
rest))
self.first = first
self.rest = rest
def __init__(self, first, second):
from scheme_builtins import scheme_valid_cdrp, SchemeError
if not (second is nil or isinstance(second, Pair)
or type(x).__name__ == 'Promise'):
raise SchemeError(
"cdr can only be a pair, nil, or a promise but was {}".format(
second))
self.first = first
self.second = second
