Note that ResourceGuard is new as of 4.1 (agronholm#674)

tapple · tapple-cisco · web-flow · commit ce941c5d95da · 2024-01-20T02:31:57.000+02:00
Co-authored-by: Tapple &lt;mfulmer@cisco.com&gt;
diff --git a/src/anyio/_core/_synchronization.py b/src/anyio/_core/_synchronization.py
@@ -623,6 +623,8 @@ class ResourceGuard:
 
     :param action: the action to guard against (visible in the :exc:`BusyResourceError`
         when triggered, e.g. "Another task is already {action} this resource")
+
+    .. versionadded:: 4.1
     """
 
     __slots__ = "action", "_guarded"
