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[3.11] gh-116325: Raise SyntaxError rather than IndexError on ForwardRef with empty string arg (GH-116341) (#116348)

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gh-116325: Raise `SyntaxError` rather than `IndexError` on ForwardRef with empty string arg (GH-116341)
(cherry picked from commit a29998a06b)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
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Miss Islington (bot) 2024-03-05 11:15:54 +01:00 • committed by GitHub
parent 7fa33187cb
commit f187da5b59
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3 changed files with 9 additions and 1 deletions
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Lib/typing.py
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@ -870,7 +870,7 @@ class ForwardRef(_Final, _root=True):
# If we do `def f(*args: *Ts)`, then we'll have `arg = '*Ts'`.
# Unfortunately, this isn't a valid expression on its own, so we
# do the unpacking manually.
if arg[0] == '*':
if arg.startswith('*'):
arg_to_compile = f'({arg},)[0]' # E.g. (*Ts,)[0] or (*tuple[int, int],)[0]
else:
arg_to_compile = arg