bpo-40939: Remove PEG parser easter egg

[lysnikolaou]

https://bugs.python.org/issue40939

[lysnikolaou]

Closing and reopening for the CI.

[lysnikolaou]

@pablogsal I don't know if the commit message goes into the squash commit message, but here it's currently wrong, since it mentions renaming and not removing. Should I change it or will you just take the PR title as the commit message of the squash commit?

[pablogsal]

Should I change it or will you just take the PR title as the commit message of the squash commit?

I will customize it when I merge :)

[miss-islington]

Thanks @lysnikolaou for the PR, and @gvanrossum for merging it 🌮🎉.. I'm working now to backport this PR to: 3.9.
🐍🍒⛏🤖

[bedevere-bot]

@gvanrossum: Please replace # with GH- in the commit message next time. Thanks!

[miss-islington]

Sorry @lysnikolaou and @gvanrossum, I had trouble checking out the 3.9 backport branch.
Please backport using cherry_picker on command line.
cherry_picker bcd7deed9118e365c1225de2a2e1a81bf988c6ab 3.9

[gvanrossum]

Honestly I wouldn't back port this. In 3.9 this does serve a purpose.

[pablogsal]

Honestly I wouldn't back port this. In 3.9 this does serve a purpose.

A PR is still needed to fix the buildbot errors.

[gvanrossum]

Okay, can you do it? I don't even know what the buildbot error is.

[pablogsal]

Okay, can you do it? I don't even know what the buildbot error is.

Yep, I will take care of it don't worry

[lysnikolaou]

Yep, I will take care of it don't worry

Already got something ready. I'll push soon.

[laloch]

There seem to still be some leftovers present:

$ docker run -i -t python:3.9-rc /usr/local/bin/python
Python 3.9.0rc1 (default, Aug 12 2020, 18:31:30) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import keyword
>>> keyword.iskeyword("__peg_parser__")
True
>>> assert "__peg_parser__" not in keyword.kwlist
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AssertionError

[gvanrossum]

The removal applies to 3.10.

[laloch]

Oh, I see! I should have read the comments I guess. Sorry for the noise.
I would like the change to get backported, bacause it prevents Xonsh from building its parser table right now, but never mind, we'll adjust. Thanks!