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black/parser: optimize deepcopying nodes (#2611)
[etc/vim.git] / src / blib2to3 / pytree.py
index 7843467e0129d2c3f281ffab3ff76da7d53001f3..001652df09fb85d623ede558f75a2ea102549e4e 100644 (file)
@@ -52,7 +52,7 @@ def type_repr(type_num: int) -> Union[Text, int]:
     return _type_reprs.setdefault(type_num, type_num)
 
 
     return _type_reprs.setdefault(type_num, type_num)
 
 
-_P = TypeVar("_P")
+_P = TypeVar("_P", bound="Base")
 
 NL = Union["Node", "Leaf"]
 Context = Tuple[Text, Tuple[int, int]]
 
 NL = Union["Node", "Leaf"]
 Context = Tuple[Text, Tuple[int, int]]
@@ -109,6 +109,9 @@ class Base(object):
         """
         raise NotImplementedError
 
         """
         raise NotImplementedError
 
+    def __deepcopy__(self: _P, memo: Any) -> _P:
+        return self.clone()
+
     def clone(self: _P) -> _P:
         """
         Return a cloned (deep) copy of self.
     def clone(self: _P) -> _P:
         """
         Return a cloned (deep) copy of self.