Migrated to https://github.com/llvm/llvm-project/pull/67294 .

The extension is removed.

@philnik gentle ping!

Addressed review comments, removed string(string&&, pos, n, alloc) constructor from C++20 mode again.

I appreciate it if someone helps me with the test failures. I'm not sure why the "Apple back-deployment" targets are all failing.

Add @pfusik 's change.

Thank You @ziqingluo-90!

Hi @ziqingluo-90 !
I don't have commit privileges, could you commit this for me?

Any chance you can provide some more details about why the problem is a bug in Clang (Slack seems to require signing up in order to see what's behind the link)?

Sure, I just filed this as a GitHub issue in the following link: https://github.com/llvm/llvm-project/issues/64124

BTW my Email in one of my previous patches is inserted incorrectly. I appreciate if you could possibly fix that for me.
my Email in this 0fd4175907b40fe63131482c162d7e0f76000521 commit, is inserted google.com instead of gmail.com .
Thank You!

You're welcome!
I don't have permission to commit so I'll send my Name and Email:
Name: Amirreza Ashouri
Email: ar.ashouri999@gmail.com

This attribute is trying to work around an issue with operator== instantiation, but according to https://cpplang.slack.com/archives/C6K47F8TT/p1689107603335019?thread_ts=1689107603.335019&cid=C6K47F8TT the problem is actually a bug in Clang. Shouldn't the Clang bug be fixed instead, so that this attribute won't be needed?

By the way I don't have permissions to commit so I'll send you my name and email:
Name: Amirreza Ashouri
Email: ar.ashouri999@gmail.com

I appreciate if you take a look at another patch I sent to address the ci build failure when calling clang/utils/ci/run-buildbot check-format caused by some extra white spaces.
https://reviews.llvm.org/D155814

An entry added to clang/docs/ReleaseNotes.rst
Thank You for the review!

Revised the formatting of the change.

Mistakes happen!
Although it was important for me, but don't worry, no problem!
Thank you for committing the patch on behalf of me!

You're Welcome Haowei!
Since I don't have permission to commit I'll send you my name and Email
Name: Amirreza Ashouri
Email: ar.ashouri999@gmail.com
Thank You!

You're Welcome!
I appreciate if you do. Thank You
Name: Amirreza Ashouri
Email: ar.ashouri999@gmail.com

Yes. I don't have commit access.
Name: Amirreza Ashouri
Email: ar.ashouri999@gmail.com
Thank You

there was a misspelling on the last line too