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gh-116325: Raise SyntaxError rather than IndexError on ForwardRef with empty string arg (#116341)

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Nikita Sobolev 2024-03-05 12:14:18 +03:00 • committed by GitHub
parent ffcc450a9b
commit a29998a06b
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3 changed files with 9 additions and 1 deletions
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Lib/typing.py
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@ -880,7 +880,7 @@ 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