Use classmethod for a class method

AA-Turner · AA-Turner · commit cee9efc0ab30 · 2024-07-30T01:51:27.000+01:00
diff --git a/CHANGES.rst b/CHANGES.rst
@@ -4,6 +4,8 @@ Release 8.0.2 (in development)
 Bugs fixed
 ----------
 
+* Fix the ``pygments.Formatter.__class_getitem__`` patch.
+  Patch by Adam Turner.
 
 Release 8.0.1 (released Jul 30, 2024)
 =====================================
diff --git a/sphinx/highlighting.py b/sphinx/highlighting.py
@@ -34,7 +34,7 @@
 if tuple(map(int, pygments.__version__.split('.')))[:2] < (2, 18):
     from pygments.formatter import Formatter  # NoQA: F811
 
-    Formatter.__class_getitem__ = lambda cls, name: cls  # type: ignore[attr-defined]
+    Formatter.__class_getitem__ = classmethod(lambda cls, name: cls)  # type: ignore[attr-defined]
 
 logger = logging.getLogger(__name__)
 
diff --git a/tests/test_highlighting.py b/tests/test_highlighting.py
@@ -11,7 +11,7 @@
 
 if tuple(map(int, pygments.__version__.split('.')))[:2] < (2, 18):
     from pygments.formatter import Formatter
-    Formatter.__class_getitem__ = lambda cls, name: cls  # type: ignore[attr-defined]
+    Formatter.__class_getitem__ = classmethod(lambda cls, name: cls)  # type: ignore[attr-defined]
 
 
 class MyLexer(RegexLexer):
