No error for nonlocal with a missing variable

[eltoder]

Summary

The nonlocal statement requires that the variable is a local variable in one of the parent scopes. ruff does not check this. For example:

def no_local_var():
    def setter(xx):
        nonlocal x
        x = xx
        print(x)

    return setter

(playground link: https://play.ruff.rs/f6ca3be7-208f-4ade-b68e-148d3546af6b)

This passes all checks:

$ ruff check --isolated t2.py
All checks passed!

However this fails with a SyntaxError when run:

$ python t2.py
  File "/home/eltoder/dev/scratch/t2.py", line 3
    nonlocal x
    ^^^^^^^^^^
SyntaxError: no binding for nonlocal 'x' found

Version

0.14.5

[MichaReiser]

Hi

We plan on making this a normal syntax error, but, for now, you have to enable PLE0117 to catch this (playground)

[eltoder]

I see. I think it would be better if you enabled these errors as soon as they are implemented, but I'm sure you have your reasons.