shafik added a subscriber: aaron.ballman.
shafik added a comment.

In D120862#3857340 <https://reviews.llvm.org/D120862#3857340>, @pcc wrote:

> Does that DR apply retroactively to C++17? I get the impression that "Status: 
> C++20" means that the issue was only fixed in C++20, which would make this 
> well-formed with `-std=c++17`.

This was simply an oversite in the wording of the paper see discussion here 
<https://twitter.com/zygoloid/status/965065725126651905?s=20&t=VS6_mRhxXKzho6eWswAfmA>
 and this was never intended to work.

We have some discretion about how far back to apply DRs and I believe as long 
as applying them back does not cause major disruption we do CC @aaron.ballman


Repository:
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  https://reviews.llvm.org/D120862/new/

https://reviews.llvm.org/D120862

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