Python 3.14 does not support return, break, or continue in finally

[dmamelin]

https://peps.python.org/pep-0765/
There's currently a syntax warning in eval.py, but all tests still pass and the integration works.
ast_try and the tests will need to be reworked.

[craigbarratt]

Thanks for pointing that out. eval.py only appears to do that in one place, and only if the user code does it. So perhaps we just replace that return with raising a SyntaxWarning?

[dmamelin]

My PyCharm made it look more serious than it actually is. The PEP says:

CPython will emit a SyntaxWarning in version 3.14, and we leave it open whether, and when, this will become a SyntaxError. However, we specify here that a SyntaxError is permitted by the language spec, so that other Python implementations can choose to implement that.

I checked - CPython emits a SyntaxWarning and still executes the return. I suggest matching that behavior: issue a warning and keep the return.