Avoid duplication of code

parso/tree.py

@@ -14,12 +14,7 @@ def search_ancestor(node: 'NodeOrLeaf', *node_types: str) -> 'Optional[BaseNode]
     :param node: The ancestors of this node will be checked.
     :param node_types: type names that are searched for.
     """
-    n = node.parent
-    while n is not None:
-        if n.type in node_types:
-            return n
-        n = n.parent
-    return None
+    return node.search_ancestor(*node_types)
 
 
 class NodeOrLeaf: