From: Sergey Matveev <stargrave@stargrave.org>
Date: Mon, 2 Oct 2017 13:05:55 +0000 (+0300)
Subject: Auto add __slots__ to all inherited classes
X-Git-Tag: 1.0~3
X-Git-Url: http://www.git.cypherpunks.ru/?p=pyderasn.git;a=commitdiff_plain;h=1d553e0c1bbb7639409b846fe65711ca1fb00105

Auto add __slots__ to all inherited classes
---

diff --git a/THANKS b/THANKS
index 670e586..a778939 100644
--- a/THANKS
+++ b/THANKS
@@ -1,2 +1,4 @@
 * pyasn1 (http://pyasn1.sourceforge.net/) project
 * Go encoding/asn1 (https://golang.org/pkg/encoding/asn1/) library
+* Nikolay Ivanov <gmail@nekolyanich.com> for helping with
+  AutoAddSlots metaclass
diff --git a/pyderasn.py b/pyderasn.py
index 4ae1eb0..476e4e8 100755
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -318,6 +318,7 @@ from collections import OrderedDict
 from datetime import datetime
 from math import ceil
 
+from six import add_metaclass
 from six import binary_type
 from six import byte2int
 from six import indexbytes
@@ -655,6 +656,13 @@ def len_decode(data):
 # Base class
 ########################################################################
 
+class AutoAddSlots(type):
+    def __new__(cls, name, bases, _dict):
+        _dict["__slots__"] = _dict.get("__slots__", ())
+        return type.__new__(cls, name, bases, _dict)
+
+
+@add_metaclass(AutoAddSlots)
 class Obj(object):
     """Common ASN.1 object class
 
diff --git a/tests/test_crts.py b/tests/test_crts.py
index 93162e0..5a839eb 100644
--- a/tests/test_crts.py
+++ b/tests/test_crts.py
@@ -62,7 +62,6 @@ some_oids = {
 
 
 class Version(Integer):
-    __slots__ = ()
     schema = (
         ("v1", 0),
         ("v2", 1),
@@ -71,12 +70,10 @@ class Version(Integer):
 
 
 class CertificateSerialNumber(Integer):
-    __slots__ = ()
     pass
 
 
 class AlgorithmIdentifier(Sequence):
-    __slots__ = ()
     schema = (
         ("algorithm", ObjectIdentifier()),
         ("parameters", Any(optional=True)),
@@ -84,17 +81,14 @@ class AlgorithmIdentifier(Sequence):
 
 
 class AttributeType(ObjectIdentifier):
-    __slots__ = ()
     pass
 
 
 class AttributeValue(Any):
-    __slots__ = ()
     pass
 
 
 class AttributeTypeAndValue(Sequence):
-    __slots__ = ()
     schema = (
         ("type", AttributeType()),
         ("value", AttributeValue()),
@@ -102,25 +96,21 @@ class AttributeTypeAndValue(Sequence):
 
 
 class RelativeDistinguishedName(SetOf):
-    __slots__ = ()
     schema = AttributeTypeAndValue()
     bounds = (1, float("+inf"))
 
 
 class RDNSequence(SequenceOf):
-    __slots__ = ()
     schema = RelativeDistinguishedName()
 
 
 class Name(Choice):
-    __slots__ = ()
     schema = (
         ("rdnSequence", RDNSequence()),
     )
 
 
 class Time(Choice):
-    __slots__ = ()
     schema = (
         ("utcTime", UTCTime()),
         ("generalTime", GeneralizedTime()),
@@ -128,7 +118,6 @@ class Time(Choice):
 
 
 class Validity(Sequence):
-    __slots__ = ()
     schema = (
         ("notBefore", Time()),
         ("notAfter", Time()),
@@ -136,7 +125,6 @@ class Validity(Sequence):
 
 
 class SubjectPublicKeyInfo(Sequence):
-    __slots__ = ()
     schema = (
         ("algorithm", AlgorithmIdentifier()),
         ("subjectPublicKey", BitString()),
@@ -144,12 +132,10 @@ class SubjectPublicKeyInfo(Sequence):
 
 
 class UniqueIdentifier(BitString):
-    __slots__ = ()
     pass
 
 
 class Extension(Sequence):
-    __slots__ = ()
     schema = (
         ("extnID", ObjectIdentifier()),
         ("critical", Boolean(default=False)),
@@ -158,13 +144,11 @@ class Extension(Sequence):
 
 
 class Extensions(SequenceOf):
-    __slots__ = ()
     schema = Extension()
     bounds = (1, float("+inf"))
 
 
 class TBSCertificate(Sequence):
-    __slots__ = ()
     schema = (
         ("version", Version(expl=tag_ctxc(0), default="v1")),
         ("serialNumber", CertificateSerialNumber()),
@@ -180,7 +164,6 @@ class TBSCertificate(Sequence):
 
 
 class Certificate(Sequence):
-    __slots__ = ()
     schema = (
         ("tbsCertificate", TBSCertificate()),
         ("signatureAlgorithm", AlgorithmIdentifier()),
diff --git a/tests/test_pyderasn.py b/tests/test_pyderasn.py
index 2fa22ab..0be393e 100644
--- a/tests/test_pyderasn.py
+++ b/tests/test_pyderasn.py
@@ -292,7 +292,6 @@ class CommonMixin(object):
     @given(binary())
     def test_impl_inherited(self, impl_tag):
         class Inherited(self.base_klass):
-            __slots__ = ()
             impl = impl_tag
         obj = Inherited()
         self.assertSequenceEqual(obj.impl, impl_tag)
@@ -301,7 +300,6 @@ class CommonMixin(object):
     @given(binary())
     def test_expl_inherited(self, expl_tag):
         class Inherited(self.base_klass):
-            __slots__ = ()
             expl = expl_tag
         obj = Inherited()
         self.assertSequenceEqual(obj.expl, expl_tag)
@@ -338,7 +336,7 @@ def boolean_values_strat(draw, do_expl=False):
 
 
 class BooleanInherited(Boolean):
-    __slots__ = ()
+    pass
 
 
 class TestBoolean(CommonMixin, TestCase):
@@ -626,7 +624,7 @@ def integer_values_strat(draw, do_expl=False):
 
 
 class IntegerInherited(Integer):
-    __slots__ = ()
+    pass
 
 
 class TestInteger(CommonMixin, TestCase):
@@ -642,7 +640,6 @@ class TestInteger(CommonMixin, TestCase):
         missing = names_input.pop()
 
         class Int(Integer):
-            __slots__ = ()
             schema = [(n, 123) for n in names_input]
         with self.assertRaises(ObjUnknown) as err:
             Int(missing)
@@ -651,7 +648,6 @@ class TestInteger(CommonMixin, TestCase):
     @given(sets(text_letters(), min_size=2))
     def test_known_name(self, names_input):
         class Int(Integer):
-            __slots__ = ()
             schema = [(n, 123) for n in names_input]
         Int(names_input.pop())
 
@@ -705,7 +701,6 @@ class TestInteger(CommonMixin, TestCase):
         names_input = dict(zip(names_input, values_input))
 
         class Int(Integer):
-            __slots__ = ()
             schema = names_input
         _int = Int(chosen_name)
         self.assertEqual(_int.named, chosen_name)
@@ -1029,7 +1024,7 @@ def bit_string_values_strat(draw, schema=None, value_required=False, do_expl=Fal
 
 
 class BitStringInherited(BitString):
-    __slots__ = ()
+    pass
 
 
 class TestBitString(CommonMixin, TestCase):
@@ -1063,7 +1058,6 @@ class TestBitString(CommonMixin, TestCase):
         self.assertGreater(len(obj.encode()), (leading_zeros + 1 + trailing_zeros) // 8)
 
         class BS(BitString):
-            __slots__ = ()
             schema = (("whatever", 0),)
         obj = BS("'%s1%s'B" % (("0" * leading_zeros), ("0" * trailing_zeros)))
         self.assertEqual(obj.bit_len, leading_zeros + 1)
@@ -1100,7 +1094,6 @@ class TestBitString(CommonMixin, TestCase):
         missing = _schema.pop()
 
         class BS(BitString):
-            __slots__ = ()
             schema = [(n, i) for i, n in enumerate(_schema)]
         with self.assertRaises(ObjUnknown) as err:
             BS((missing,))
@@ -1155,7 +1148,6 @@ class TestBitString(CommonMixin, TestCase):
             ) = d.draw(bit_string_values_strat())
 
             class BS(klass):
-                __slots__ = ()
                 schema = schema_initial
             obj_initial = BS(
                 value=value_initial,
@@ -1200,7 +1192,6 @@ class TestBitString(CommonMixin, TestCase):
             _schema, value, impl, expl, default, optional, _decoded = values
 
             class BS(klass):
-                __slots__ = ()
                 schema = _schema
             obj = BS(
                 value=value,
@@ -1283,7 +1274,6 @@ class TestBitString(CommonMixin, TestCase):
         offset = d.draw(integers(min_value=0))
         for klass in (BitString, BitStringInherited):
             class BS(klass):
-                __slots__ = ()
                 schema = _schema
             obj = BS(
                 value=value,
@@ -1408,7 +1398,7 @@ def octet_string_values_strat(draw, do_expl=False):
 
 
 class OctetStringInherited(OctetString):
-    __slots__ = ()
+    pass
 
 
 class TestOctetString(CommonMixin, TestCase):
@@ -1690,7 +1680,7 @@ def null_values_strat(draw, do_expl=False):
 
 
 class NullInherited(Null):
-    __slots__ = ()
+    pass
 
 
 class TestNull(CommonMixin, TestCase):
@@ -1883,7 +1873,7 @@ def oid_values_strat(draw, do_expl=False):
 
 
 class ObjectIdentifierInherited(ObjectIdentifier):
-    __slots__ = ()
+    pass
 
 
 class TestObjectIdentifier(CommonMixin, TestCase):
@@ -2212,7 +2202,6 @@ def enumerated_values_strat(draw, schema=None, do_expl=False):
 
 class TestEnumerated(CommonMixin, TestCase):
     class EWhatever(Enumerated):
-        __slots__ = ()
         schema = (("whatever", 0),)
 
     base_klass = EWhatever
@@ -2231,7 +2220,6 @@ class TestEnumerated(CommonMixin, TestCase):
         missing = schema_input.pop()
 
         class E(Enumerated):
-            __slots__ = ()
             schema = [(n, 123) for n in schema_input]
         with self.assertRaises(ObjUnknown) as err:
             E(missing)
@@ -2247,7 +2235,6 @@ class TestEnumerated(CommonMixin, TestCase):
         _input = list(zip(schema_input, values_input))
 
         class E(Enumerated):
-            __slots__ = ()
             schema = _input
         with self.assertRaises(DecodeError) as err:
             E(missing_value)
@@ -2274,14 +2261,13 @@ class TestEnumerated(CommonMixin, TestCase):
     @given(integers(), integers(), binary(), binary())
     def test_comparison(self, value1, value2, tag1, tag2):
         class E(Enumerated):
-            __slots__ = ()
             schema = (
                 ("whatever0", value1),
                 ("whatever1", value2),
             )
 
         class EInherited(E):
-            __slots__ = ()
+            pass
         for klass in (E, EInherited):
             obj1 = klass(value1)
             obj2 = klass(value2)
@@ -2304,7 +2290,6 @@ class TestEnumerated(CommonMixin, TestCase):
         ) = d.draw(enumerated_values_strat())
 
         class E(Enumerated):
-            __slots__ = ()
             schema = schema_initial
         obj_initial = E(
             value=value_initial,
@@ -2362,7 +2347,6 @@ class TestEnumerated(CommonMixin, TestCase):
         schema_input, value, impl, expl, default, optional, _decoded = values
 
         class E(Enumerated):
-            __slots__ = ()
             schema = schema_input
         obj = E(
             value=value,
@@ -2387,7 +2371,6 @@ class TestEnumerated(CommonMixin, TestCase):
         value = d.draw(sampled_from(sorted([v for _, v in schema_input])))
 
         class E(Enumerated):
-            __slots__ = ()
             schema = schema_input
         obj = E(
             value=value,
@@ -3137,7 +3120,7 @@ def any_values_strat(draw, do_expl=False):
 
 
 class AnyInherited(Any):
-    __slots__ = ()
+    pass
 
 
 class TestAny(CommonMixin, TestCase):
@@ -3367,7 +3350,7 @@ def choice_values_strat(draw, value_required=False, schema=None, do_expl=False):
 
 
 class ChoiceInherited(Choice):
-    __slots__ = ()
+    pass
 
 
 class TestChoice(CommonMixin, TestCase):
@@ -3424,7 +3407,7 @@ class TestChoice(CommonMixin, TestCase):
     @given(booleans(), booleans())
     def test_comparison(self, value1, value2):
         class WahlInherited(self.base_klass):
-            __slots__ = ()
+            pass
         for klass in (self.base_klass, WahlInherited):
             obj1 = klass(("whatever", Boolean(value1)))
             obj2 = klass(("whatever", Boolean(value2)))
@@ -3445,7 +3428,6 @@ class TestChoice(CommonMixin, TestCase):
             ) = d.draw(choice_values_strat())
 
             class Wahl(klass):
-                __slots__ = ()
                 schema = schema_initial
             obj_initial = Wahl(
                 value=value_initial,
@@ -3497,7 +3479,6 @@ class TestChoice(CommonMixin, TestCase):
         _schema, value, expl, default, optional, _decoded = values
 
         class Wahl(self.base_klass):
-            __slots__ = ()
             schema = _schema
         obj = Wahl(
             value=value,
@@ -3541,7 +3522,6 @@ class TestChoice(CommonMixin, TestCase):
         offset = d.draw(integers(min_value=0))
 
         class Wahl(self.base_klass):
-            __slots__ = ()
             schema = _schema
         obj = Wahl(
             value=value,
@@ -3714,7 +3694,7 @@ def sequence_strat(draw, seq_klass):
     for i, (klass, value, default) in enumerate(inputs):
         schema.append((names[i], klass(default=default, **inits[i])))
     seq_name = draw(text_letters())
-    Seq = type(seq_name, (seq_klass,), {"__slots__": (), "schema": tuple(schema)})
+    Seq = type(seq_name, (seq_klass,), {"schema": tuple(schema)})
     seq = Seq()
     expects = []
     for i, (klass, value, default) in enumerate(inputs):
@@ -3777,7 +3757,7 @@ def sequences_strat(draw, seq_klass):
             seq(default=(seq if i in defaulted else None), **inits[i]),
         ))
     seq_name = draw(text_letters())
-    Seq = type(seq_name, (seq_klass,), {"__slots__": (), "schema": tuple(schema)})
+    Seq = type(seq_name, (seq_klass,), {"schema": tuple(schema)})
     seq_outer = Seq()
     expect_outers = []
     for name, (seq_inner, expects_inner) in zip(names, seq_expectses):
@@ -3801,7 +3781,6 @@ class SeqMixing(object):
 
     def test_invalid_value_type_set(self):
         class Seq(self.base_klass):
-            __slots__ = ()
             schema = (("whatever", Boolean()),)
         seq = Seq()
         with self.assertRaises(InvalidValueType) as err:
@@ -3836,7 +3815,6 @@ class SeqMixing(object):
             schema_input.append((name, Boolean()))
 
         class Seq(self.base_klass):
-            __slots__ = ()
             schema = tuple(schema_input)
         seq = Seq()
         for name in ready.keys():
@@ -3862,7 +3840,7 @@ class SeqMixing(object):
     @given(data_strategy())
     def test_call(self, d):
         class SeqInherited(self.base_klass):
-            __slots__ = ()
+            pass
         for klass in (self.base_klass, SeqInherited):
             (
                 value_initial,
@@ -3918,7 +3896,7 @@ class SeqMixing(object):
     @given(data_strategy())
     def test_copy(self, d):
         class SeqInherited(self.base_klass):
-            __slots__ = ()
+            pass
         for klass in (self.base_klass, SeqInherited):
             values = d.draw(seq_values_strat(seq_klass=klass))
             obj = klass(*values)
@@ -3933,7 +3911,6 @@ class SeqMixing(object):
         tag_impl = tag_encode(d.draw(integers(min_value=1)))
 
         class Seq(self.base_klass):
-            __slots__ = ()
             impl = tag_impl
             schema = (("whatever", Integer()),)
         seq = Seq()
@@ -3947,7 +3924,6 @@ class SeqMixing(object):
         tag_expl = tag_ctxc(d.draw(integers(min_value=1)))
 
         class Seq(self.base_klass):
-            __slots__ = ()
             expl = tag_expl
             schema = (("whatever", Integer()),)
         seq = Seq()
@@ -3966,7 +3942,6 @@ class SeqMixing(object):
             assume(False)
 
         class Seq(self.base_klass):
-            __slots__ = ()
             schema = (
                 ("whatever", Integer()),
                 ("junk", Any()),
@@ -4093,7 +4068,6 @@ class SeqMixing(object):
         )).items())
 
         class Seq(self.base_klass):
-            __slots__ = ()
             schema = [
                 (n, Integer(default=d))
                 for n, (_, d) in _schema
@@ -4123,7 +4097,6 @@ class SeqMixing(object):
         ))]
 
         class SeqWithoutDefault(self.base_klass):
-            __slots__ = ()
             schema = [
                 (n, Integer(impl=t))
                 for (n, _), t in zip(_schema, tags)
@@ -4134,7 +4107,6 @@ class SeqMixing(object):
         seq_encoded = seq_without_default.encode()
 
         class SeqWithDefault(self.base_klass):
-            __slots__ = ()
             schema = [
                 (n, Integer(default=v, impl=t))
                 for (n, v), t in zip(_schema, tags)
@@ -4156,7 +4128,6 @@ class SeqMixing(object):
         names_tags = [(name, tag) for tag, name in sorted(zip(tags, names))]
 
         class SeqFull(self.base_klass):
-            __slots__ = ()
             schema = [(n, Integer(impl=t)) for n, t in names_tags]
         seq_full = SeqFull()
         for i, name in enumerate(names):
@@ -4165,7 +4136,6 @@ class SeqMixing(object):
         altered = names_tags[:-2] + names_tags[-1:]
 
         class SeqMissing(self.base_klass):
-            __slots__ = ()
             schema = [(n, Integer(impl=t)) for n, t in altered]
         seq_missing = SeqMissing()
         with self.assertRaises(TagMismatch):
@@ -4181,7 +4151,6 @@ class TestSequence(SeqMixing, CommonMixin, TestCase):
     )
     def test_remaining(self, value, junk):
         class Seq(Sequence):
-            __slots__ = ()
             schema = (
                 ("whatever", Integer()),
             )
@@ -4199,7 +4168,6 @@ class TestSequence(SeqMixing, CommonMixin, TestCase):
         missing = names.pop()
 
         class Seq(Sequence):
-            __slots__ = ()
             schema = [(n, Boolean()) for n in names]
         seq = Seq()
         with self.assertRaises(ObjUnknown) as err:
@@ -4222,7 +4190,6 @@ class TestSet(SeqMixing, CommonMixin, TestCase):
         ]
 
         class Seq(Set):
-            __slots__ = ()
             schema = [(str(i), OctetString(impl=t)) for i, t in enumerate(tags)]
         seq = Seq()
         for name, _ in Seq.schema:
@@ -4287,7 +4254,6 @@ class SeqOfMixing(object):
 
     def test_invalid_values_type(self):
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = Integer()
         with self.assertRaises(InvalidValueType) as err:
             SeqOf([Integer(123), Boolean(False), Integer(234)])
@@ -4300,7 +4266,6 @@ class SeqOfMixing(object):
     @given(booleans(), booleans(), binary(), binary())
     def test_comparison(self, value1, value2, tag1, tag2):
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = Boolean()
         obj1 = SeqOf([Boolean(value1)])
         obj2 = SeqOf([Boolean(value2)])
@@ -4314,7 +4279,6 @@ class SeqOfMixing(object):
     @given(lists(booleans()))
     def test_iter(self, values):
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = Boolean()
         obj = SeqOf([Boolean(value) for value in values])
         self.assertEqual(len(obj), len(values))
@@ -4334,7 +4298,6 @@ class SeqOfMixing(object):
         ]
 
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = Integer()
         values = d.draw(permutations(ready + non_ready))
         seqof = SeqOf()
@@ -4356,7 +4319,6 @@ class SeqOfMixing(object):
 
     def test_spec_mismatch(self):
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = Integer()
         seqof = SeqOf()
         seqof.append(Integer(123))
@@ -4368,7 +4330,6 @@ class SeqOfMixing(object):
     @given(data_strategy())
     def test_bounds_satisfied(self, d):
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = Boolean()
         bound_min = d.draw(integers(min_value=0, max_value=1 << 7))
         bound_max = d.draw(integers(min_value=bound_min, max_value=1 << 7))
@@ -4378,7 +4339,6 @@ class SeqOfMixing(object):
     @given(data_strategy())
     def test_bounds_unsatisfied(self, d):
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = Boolean()
         bound_min = d.draw(integers(min_value=1, max_value=1 << 7))
         bound_max = d.draw(integers(min_value=bound_min, max_value=1 << 7))
@@ -4397,7 +4357,6 @@ class SeqOfMixing(object):
     @given(integers(min_value=1, max_value=10))
     def test_out_of_bounds(self, bound_max):
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = Integer()
             bounds = (0, bound_max)
         seqof = SeqOf()
@@ -4420,7 +4379,6 @@ class SeqOfMixing(object):
         ) = d.draw(seqof_values_strat())
 
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = schema_initial
         obj_initial = SeqOf(
             value=value_initial,
@@ -4498,7 +4456,6 @@ class SeqOfMixing(object):
         _schema, value, bounds, impl, expl, default, optional, _decoded = values
 
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = _schema
         obj = SeqOf(
             value=value,
@@ -4521,7 +4478,6 @@ class SeqOfMixing(object):
     )
     def test_stripped(self, values, tag_impl):
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = OctetString()
         obj = SeqOf([OctetString(v) for v in values], impl=tag_impl)
         with self.assertRaises(NotEnoughData):
@@ -4533,7 +4489,6 @@ class SeqOfMixing(object):
     )
     def test_stripped_expl(self, values, tag_expl):
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = OctetString()
         obj = SeqOf([OctetString(v) for v in values], expl=tag_expl)
         with self.assertRaises(NotEnoughData):
@@ -4590,7 +4545,6 @@ class SeqOfMixing(object):
         _, _, _, _, _, default, optional, _decoded = values
 
         class SeqOf(self.base_klass):
-            __slots__ = ()
             schema = Integer()
         obj = SeqOf(
             value=value,
@@ -4639,7 +4593,6 @@ class SeqOfMixing(object):
 
 class TestSequenceOf(SeqOfMixing, CommonMixin, TestCase):
     class SeqOf(SequenceOf):
-        __slots__ = ()
         schema = "whatever"
     base_klass = SeqOf
 
@@ -4650,7 +4603,6 @@ class TestSequenceOf(SeqOfMixing, CommonMixin, TestCase):
 
 class TestSetOf(SeqOfMixing, CommonMixin, TestCase):
     class SeqOf(SetOf):
-        __slots__ = ()
         schema = "whatever"
     base_klass = SeqOf
 
@@ -4666,7 +4618,6 @@ class TestSetOf(SeqOfMixing, CommonMixin, TestCase):
         values = [OctetString(v) for v in d.draw(lists(binary()))]
 
         class Seq(SetOf):
-            __slots__ = ()
             schema = OctetString()
         seq = Seq(values)
         seq_encoded = seq.encode()
@@ -4686,7 +4637,6 @@ class TestGoMarshalVectors(TestCase):
         self.assertSequenceEqual(Integer(-129).encode(), hexdec("0202ff7f"))
 
         class Seq(Sequence):
-            __slots__ = ()
             schema = (
                 ("erste", Integer()),
                 ("zweite", Integer(optional=True))
@@ -4701,7 +4651,6 @@ class TestGoMarshalVectors(TestCase):
         self.assertSequenceEqual(seq.encode(), hexdec("3006020140020141"))
 
         class NestedSeq(Sequence):
-            __slots__ = ()
             schema = (
                 ("nest", Seq()),
             )
@@ -4717,7 +4666,6 @@ class TestGoMarshalVectors(TestCase):
         )
 
         class Seq(Sequence):
-            __slots__ = ()
             schema = (
                 ("erste", Integer(impl=tag_encode(5, klass=TagClassContext))),
             )
@@ -4726,7 +4674,6 @@ class TestGoMarshalVectors(TestCase):
         self.assertSequenceEqual(seq.encode(), hexdec("3003850140"))
 
         class Seq(Sequence):
-            __slots__ = ()
             schema = (
                 ("erste", Integer(expl=tag_ctxc(5))),
             )
@@ -4735,7 +4682,6 @@ class TestGoMarshalVectors(TestCase):
         self.assertSequenceEqual(seq.encode(), hexdec("3005a503020140"))
 
         class Seq(Sequence):
-            __slots__ = ()
             schema = (
                 ("erste", Null(
                     impl=tag_encode(0, klass=TagClassContext),
@@ -4762,7 +4708,6 @@ class TestGoMarshalVectors(TestCase):
         )
 
         class Seq(Sequence):
-            __slots__ = ()
             schema = (
                 ("erste", GeneralizedTime()),
             )
@@ -4810,7 +4755,6 @@ class TestGoMarshalVectors(TestCase):
         self.assertSequenceEqual(UTF8String("Σ").encode(), hexdec("0c02cea3"))
 
         class Seq(Sequence):
-            __slots__ = ()
             schema = (
                 ("erste", IA5String()),
             )
@@ -4819,7 +4763,6 @@ class TestGoMarshalVectors(TestCase):
         self.assertSequenceEqual(seq.encode(), hexdec("3006160474657374"))
 
         class Seq(Sequence):
-            __slots__ = ()
             schema = (
                 ("erste", PrintableString()),
             )
@@ -4830,7 +4773,6 @@ class TestGoMarshalVectors(TestCase):
         self.assertSequenceEqual(seq.encode(), hexdec("30071305746573742a"))
 
         class Seq(Sequence):
-            __slots__ = ()
             schema = (
                 ("erste", Any(optional=True)),
                 ("zweite", Integer()),
@@ -4840,18 +4782,15 @@ class TestGoMarshalVectors(TestCase):
         self.assertSequenceEqual(seq.encode(), hexdec("3003020140"))
 
         class Seq(SetOf):
-            __slots__ = ()
             schema = Integer()
         seq = Seq()
         seq.append(Integer(10))
         self.assertSequenceEqual(seq.encode(), hexdec("310302010a"))
 
         class _SeqOf(SequenceOf):
-            __slots__ = ()
             schema = PrintableString()
 
         class SeqOf(SequenceOf):
-            __slots__ = ()
             schema = _SeqOf()
         _seqof = _SeqOf()
         _seqof.append(PrintableString("1"))
@@ -4860,7 +4799,6 @@ class TestGoMarshalVectors(TestCase):
         self.assertSequenceEqual(seqof.encode(), hexdec("30053003130131"))
 
         class Seq(Sequence):
-            __slots__ = ()
             schema = (
                 ("erste", Integer(default=1)),
             )
@@ -4885,3 +4823,13 @@ class TestPP(TestCase):
         pp = _pp(asn1_type_name=ObjectIdentifier.asn1_type_name, value=chosen)
         self.assertNotIn(chosen_id, pp_console_row(pp))
         self.assertIn(chosen_id, pp_console_row(pp, oids=oids))
+
+
+class TestAutoAddSlots(TestCase):
+    def runTest(self):
+        class Inher(Integer):
+            pass
+
+        with self.assertRaises(AttributeError):
+            inher = Inher()
+            inher.unexistent = "whatever"