gh-126139: Improve error message location for future statement with unknown feature

[brianschubert]

Fixes #126139

The error location is now set to the location of the undefined feature name:

>>> from __future__ import division, with_statement, pirnt_function
  File "<python-input-0>", line 1
    from __future__ import division, with_statement, pirnt_function
                                                     ^^^^^^^^^^^^^^
SyntaxError: future feature pirnt_function is not defined

I wasn't sure if this is noteworthy enough for a What's New entry. Let me know if I should add one.

• Issue: Improve error message locations for future statements with unknown future features #126139

[iritkatriel]

@pablogsal Would you backdoort this?

[pablogsal]

To 3.11? Unfortunately as much as I want we are past bug fix period and I don't think this qualifies as a security fix :(

[pablogsal]

@pablogsal Would you backdoort this?

To other branches yes: I think this easily qualifies as a bug fix

[miss-islington-app]

Thanks @brianschubert for the PR, and @iritkatriel for merging it 🌮🎉.. I'm working now to backport this PR to: 3.12, 3.13.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @brianschubert and @iritkatriel, I could not cleanly backport this to 3.12 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 224c370a3680132997f1e43d20a3b4ca95a060ab 3.12

[bedevere-app]

GH-126155 is a backport of this pull request to the 3.13 branch.

[iritkatriel]

Sorry, @brianschubert and @iritkatriel, I could not cleanly backport this to 3.12 due to a conflict. Please backport using cherry_picker on command line.

cherry_picker 224c370a3680132997f1e43d20a3b4ca95a060ab 3.12

This will require a manual backport to 3.12.

[bedevere-app]

GH-126160 is a backport of this pull request to the 3.12 branch.