From 8a964ab089182b372e0d5f9c722f001399792b03 Mon Sep 17 00:00:00 2001
From: Yurii Karabas <1998uriyyo@gmail.com>
Date: Mon, 13 Sep 2021 11:16:56 +0300
Subject: [PATCH 1/2] bpo-45167: Add ability to deepcopy types.GenericAlias

---
 Lib/copy.py                                                 | 4 ++++
 Lib/test/test_copy.py                                       | 6 ++++++
 .../2021-09-13-11-15-33.bpo-45167.lupMrM.rst                | 2 ++
 3 files changed, 12 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2021-09-13-11-15-33.bpo-45167.lupMrM.rst

diff --git a/Lib/copy.py b/Lib/copy.py
index dd41c54dffe1d71..8ab9d79891eacbb 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -238,6 +238,10 @@ def _deepcopy_method(x, memo): # Copy instance methods
     return type(x)(x.__func__, deepcopy(x.__self__, memo))
 d[types.MethodType] = _deepcopy_method
 
+def _deepcopy_genericalias(x, memo):
+    return type(x)(deepcopy(x.__origin__, memo), deepcopy(x.__args__, memo))
+d[types.GenericAlias] = _deepcopy_genericalias
+
 del d
 
 def _keep_alive(x, memo):
diff --git a/Lib/test/test_copy.py b/Lib/test/test_copy.py
index f1ca8cb254d1887..344a964e732adbb 100644
--- a/Lib/test/test_copy.py
+++ b/Lib/test/test_copy.py
@@ -874,6 +874,12 @@ def m(self):
         self.assertIs(g.b.__self__, g)
         g.b()
 
+    def test_deepcopy_generic_alias(self):
+        x = list[int]
+        g = copy.deepcopy(x)
+
+        self.assertEqual(x, g)
+
 
 def global_foo(x, y): return x+y
 
diff --git a/Misc/NEWS.d/next/Core and Builtins/2021-09-13-11-15-33.bpo-45167.lupMrM.rst b/Misc/NEWS.d/next/Core and Builtins/2021-09-13-11-15-33.bpo-45167.lupMrM.rst
new file mode 100644
index 000000000000000..6aff3a34630dd53
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2021-09-13-11-15-33.bpo-45167.lupMrM.rst	
@@ -0,0 +1,2 @@
+Add ability to deepcopy ``types.GenericAlias``. Patch provided by Yurii
+Karabas.

From c59c7e980b5691b227c9c66e4e0ca6577a6e65f9 Mon Sep 17 00:00:00 2001
From: Yurii Karabas <1998uriyyo@gmail.com>
Date: Tue, 14 Sep 2021 15:25:23 +0300
Subject: [PATCH 2/2] Add __deepcopy__, __copy__ to GenericAlias blacklist

---
 Lib/copy.py                  | 4 ----
 Objects/genericaliasobject.c | 2 ++
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/Lib/copy.py b/Lib/copy.py
index 8ab9d79891eacbb..dd41c54dffe1d71 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -238,10 +238,6 @@ def _deepcopy_method(x, memo): # Copy instance methods
     return type(x)(x.__func__, deepcopy(x.__self__, memo))
 d[types.MethodType] = _deepcopy_method
 
-def _deepcopy_genericalias(x, memo):
-    return type(x)(deepcopy(x.__origin__, memo), deepcopy(x.__args__, memo))
-d[types.GenericAlias] = _deepcopy_genericalias
-
 del d
 
 def _keep_alive(x, memo):
diff --git a/Objects/genericaliasobject.c b/Objects/genericaliasobject.c
index 38b68e410c443c3..dbe5d89b7396296 100644
--- a/Objects/genericaliasobject.c
+++ b/Objects/genericaliasobject.c
@@ -418,6 +418,8 @@ static const char* const attr_exceptions[] = {
     "__mro_entries__",
     "__reduce_ex__",  // needed so we don't look up object.__reduce_ex__
     "__reduce__",
+    "__copy__",
+    "__deepcopy__",
     NULL,
 };