From 300e9a9d5c834e1307ed130378a2530d5bb6a968 Mon Sep 17 00:00:00 2001
From: Hynek Schlawack <hs@ox.cx>
Date: Sat, 20 Mar 2021 10:06:56 +0100
Subject: [PATCH 1/2] Detect ClassVars coming from typing_extensions

---
 src/attr/_make.py         |  7 ++++++-
 tests/test_annotations.py | 12 ++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/attr/_make.py b/src/attr/_make.py
index 3b02bbb15..d0a251112 100644
--- a/src/attr/_make.py
+++ b/src/attr/_make.py
@@ -41,7 +41,12 @@
 _tuple_property_pat = (
     "    {attr_name} = _attrs_property(_attrs_itemgetter({index}))"
 )
-_classvar_prefixes = ("typing.ClassVar", "t.ClassVar", "ClassVar")
+_classvar_prefixes = (
+    "typing.ClassVar",
+    "t.ClassVar",
+    "ClassVar",
+    "typing_extensions.ClassVar",
+)
 # we don't use a double-underscore prefix because that triggers
 # name mangling when trying to create a slot for the field
 # (when slots=True)
diff --git a/tests/test_annotations.py b/tests/test_annotations.py
index 203b8ddee..2df6311b2 100644
--- a/tests/test_annotations.py
+++ b/tests/test_annotations.py
@@ -418,6 +418,18 @@ class C:
             foo=typing.Optional[typing.Any],
         )
 
+    @pytest.mark.parametrize("slots", [True, False])
+    def test_typing_extensions_classvar(self, slots):
+        """
+        If ClassVar is coming from typing_extensions, it is recognized too.
+        """
+
+        @attr.s(auto_attribs=True, slots=slots)
+        class C:
+            cls_var: "typing_extensions.ClassVar" = 23  # noqa
+
+        assert_init_annotations(C)
+
     def test_keyword_only_auto_attribs(self):
         """
         `kw_only` propagates to attributes defined via `auto_attribs`.

From 627e35ea80f9ca1b652b26392b859758c412c835 Mon Sep 17 00:00:00 2001
From: Hynek Schlawack <hs@ox.cx>
Date: Sat, 20 Mar 2021 10:10:18 +0100
Subject: [PATCH 2/2] Add newsfragment

---
 changelog.d/782.change.rst | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog.d/782.change.rst

diff --git a/changelog.d/782.change.rst b/changelog.d/782.change.rst
new file mode 100644
index 000000000..9314ccf29
--- /dev/null
+++ b/changelog.d/782.change.rst
@@ -0,0 +1 @@
+``ClassVar``\ s are now also detected if they come from `typing-extensions <https://pypi.org/project/typing-extensions/>`_.