From b551e9f0ff25018a5606465003e2c51c04f693a3 Mon Sep 17 00:00:00 2001
From: Ivan Levkivskyi <levkivskyi@gmail.com>
Date: Thu, 10 May 2018 23:10:10 -0400
Subject: [PATCH] Fix a bug in Generic.__new__ (GH-6758)

---
 Lib/test/test_typing.py | 3 +++
 Lib/typing.py           | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index 46bab5eba6d..314716cd7de 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -1367,6 +1367,9 @@ class GenericTests(BaseTestCase):
         class A(Generic[T]):
             pass
 
+        with self.assertRaises(TypeError):
+            A('foo')
+
         class B:
             def __new__(cls):
                 # call object
diff --git a/Lib/typing.py b/Lib/typing.py
index 89b73db1583..8025dfd9326 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -836,7 +836,7 @@ class Generic:
         if cls is Generic:
             raise TypeError("Type Generic cannot be instantiated; "
                             "it can be used only as a base class")
-        if super().__new__ is object.__new__:
+        if super().__new__ is object.__new__ and cls.__init__ is not object.__init__:
             obj = super().__new__(cls)
         else:
             obj = super().__new__(cls, *args, **kwds)