A tiny improvement

Author: sadra-barikbin

src/_pytest/doctest.py

@@ -262,13 +262,10 @@ def __init__(
         self.dtest = dtest
         self.obj = None
 
-        def func() -> None:
-            pass
-
         self.funcargs: Dict[str, object] = {}  # type: ignore[attr-defined]
         fm = self.session._fixturemanager
         self._fixtureinfo = fm.getfixtureinfo(  # type: ignore[attr-defined]
-            node=self, func=func, cls=None, funcargs=False
+            node=self, func=lambda: None, cls=None, funcargs=False
         )
         self._request = FixtureRequest(self, _ispytest=True)