gh-99180: Remove traceback anchors in return and assign statements that cover all the displayed range

[pablogsal]

• Issue: Elide uninformative traceback indicators in return and simple assignment statements #99180

[AlexWaygood]

Spotted some minor typos:

[pablogsal]

Hey @lysnikolaou, can you check if this is more or less what you had in mind? (I will rebase soon)

[lysnikolaou]

This looks a lot like what I had in mind and seeing the implementation I think it's a step towards the right direction!

[lysnikolaou]

@pablogsal Let's merge this?

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot iOS ARM64 Simulator 3.x has failed when building commit 4a08a75.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1380/builds/143) and take a look at the build logs.
4. Check if the failure is related to this commit (4a08a75) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1380/builds/143

Failed tests:

• test_socket

Failed subtests:

• test_dual_stack_client_v6 - test.test_socket.CreateServerFunctionalTest.test_dual_stack_client_v6

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/Users/buildbot/Library/Developer/XCTestDevices/358FF9CB-4D5D-4034-8AFB-6FDD92A7A50B/data/Containers/Bundle/Application/1CB439A9-DD6A-4243-BF2F-EC7DA3A99532/iOSTestbed.app/python/lib/python3.13/test/test_socket.py", line 6847, in test_dual_stack_client_v6
    with socket.create_server(("", port), family=socket.AF_INET6,
         ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                              dualstack_ipv6=True) as sock:
                              ^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/Library/Developer/XCTestDevices/358FF9CB-4D5D-4034-8AFB-6FDD92A7A50B/data/Containers/Bundle/Application/1CB439A9-DD6A-4243-BF2F-EC7DA3A99532/iOSTestbed.app/python/lib/python3.13/socket.py", line 934, in create_server
    raise error(err.errno, msg) from None
OSError: [Errno 48] Address already in use (while attempting to bind on address ('', 57463))

[AlexWaygood]

Is this method meant to be a public-API method on StackSummary objects, or is it meant to be private API? If the former, we should probably document it at https://docs.python.org/3.13/library/traceback.html#stacksummary-objects. If the latter, maybe it should have a name prefixed with an underscore?

[pablogsal]

It should be private so I am fine prefixing it with an underscore

[AlexWaygood]

#119554