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bpo-36290: Fix keytword collision handling in AST node constructors (GH-12382)

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(cherry picked from commit c73914a562)

Co-authored-by: Rémi Lapeyre <remi.lapeyre@lenstra.fr>
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Miss Islington (bot) 2020-05-24 14:32:32 -07:00 • committed by GitHub
parent 46c1b9c7b5
commit 1a4e9e6f35
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5 changed files with 68 additions and 8 deletions
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7
Lib/ast.py
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@ -524,6 +524,13 @@ class _ABC(type):
return type.__instancecheck__(cls, inst)
def _new(cls, *args, **kwargs):
for key in kwargs:
if key not in cls._fields:
# arbitrary keyword arguments are accepted
continue
pos = cls._fields.index(key)
if pos < len(args):
raise TypeError(f"{cls.__name__} got multiple values for argument {key!r}")
if cls in _const_types:
return Constant(*args, **kwargs)
return Constant.__new__(cls, *args, **kwargs)