philnik added a comment.

In D143524#4148344 <https://reviews.llvm.org/D143524#4148344>, @v.g.vassilev 
wrote:

> In D143524#4148271 <https://reviews.llvm.org/D143524#4148271>, @philnik wrote:
>
>> It looks like this warning is incompatible with `-Wctad-maybe-unsupported`. 
>> It warns that the deduction guide is unused, but the deduction guide is 
>> required suppress `-Wctad-maybe-unsupported`. https://godbolt.org/z/G8bMjYsbn
>
> That should not be too hard to fix. It seems that just need to ignore 
> `CXXDeductionGuideDecl` in `Sema::ShouldRemoveFromUnused`. Is that blocking 
> you?

No, I just added a `[[maybe_unused]]`. D144667 
<https://reviews.llvm.org/D144667> should fix any libc++ problems.


Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D143524/new/

https://reviews.llvm.org/D143524

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