v.g.vassilev added a comment.

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?


Repository:
  rC Clang

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

https://reviews.llvm.org/D143524

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