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SyntaxError location for *args in class bases is inconsistent #93165

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tusharsadhwani opened this issue May 24, 2022 · 1 comment
Open

SyntaxError location for *args in class bases is inconsistent #93165

tusharsadhwani opened this issue May 24, 2022 · 1 comment
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3.10 interpreter-core type-bug

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@tusharsadhwani
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@tusharsadhwani tusharsadhwani commented May 24, 2022 •
edited

Code snippet:

class C(list[int]): ...

On Python 3.9:

>>> class C(list[*a]): ...
  File "<stdin>", line 1
    class C(list[*a]): ...
                   ^
SyntaxError: invalid syntax
>>>

On Python 3.10:

>>> class C(list[*a]): ...
  File "<stdin>", line 1
    class C(list[*a]): ...
           ^
SyntaxError: expected ':'
>>>

I'd have expected it to point directly at the * in both cases.
@tusharsadhwani tusharsadhwani added the type-bug label May 24, 2022
@AlexWaygood AlexWaygood added interpreter-core 3.10 labels May 24, 2022
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@AlexWaygood AlexWaygood commented May 24, 2022 •
edited

Reproduced on 3.9/3.10 (but not on 3.11, where this isn't a SyntaxError at all due to PEP 646).

Cc. @pablogsal

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@tusharsadhwani @AlexWaygood