bpo-45664: Fix resolve_bases() and new_class() for GenericAlias instance as a base (GH-29298)

(cherry picked from commit 2b318ce1c988b7b6e3caf293d55f289e066b6e0f)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

2 files changed, 17 insertions, 1 deletions

diff --git a/Lib/test/test_types.py b/Lib/test/test_types.py
index b1218ab..3dfda5c 100644
--- a/Lib/test/test_types.py
+++ b/Lib/test/test_types.py
@@ -1236,6 +1236,17 @@ class ClassCreationTests(unittest.TestCase):
         self.assertEqual(D.__orig_bases__, (c,))
         self.assertEqual(D.__mro__, (D, A, object))
 
+    def test_new_class_with_mro_entry_genericalias(self):
+        L1 = types.new_class('L1', (typing.List[int],), {})
+        self.assertEqual(L1.__bases__, (list, typing.Generic))
+        self.assertEqual(L1.__orig_bases__, (typing.List[int],))
+        self.assertEqual(L1.__mro__, (L1, list, typing.Generic, object))
+
+        L2 = types.new_class('L2', (list[int],), {})
+        self.assertEqual(L2.__bases__, (list,))
+        self.assertEqual(L2.__orig_bases__, (list[int],))
+        self.assertEqual(L2.__mro__, (L2, list, object))
+
     def test_new_class_with_mro_entry_none(self):
         class A: pass
         class B: pass
@@ -1351,6 +1362,11 @@ class ClassCreationTests(unittest.TestCase):
         for bases in [x, y, z, t]:
             self.assertIs(types.resolve_bases(bases), bases)
 
+    def test_resolve_bases_with_mro_entry(self):
+        self.assertEqual(types.resolve_bases((typing.List[int],)),
+                         (list, typing.Generic))
+        self.assertEqual(types.resolve_bases((list[int],)), (list,))
+
     def test_metaclass_derivation(self):
         # issue1294232: correct metaclass calculation
         new_calls = []  # to check the order of __new__ calls
diff --git a/Lib/types.py b/Lib/types.py
index c2dc97d..62122a9 100644
--- a/Lib/types.py
+++ b/Lib/types.py
@@ -82,7 +82,7 @@ def resolve_bases(bases):
     updated = False
     shift = 0
     for i, base in enumerate(bases):
-        if isinstance(base, type):
+        if isinstance(base, type) and not isinstance(base, GenericAlias):
             continue
         if not hasattr(base, "__mro_entries__"):
             continue