cjdb added a comment.

In D135341#3841126 <https://reviews.llvm.org/D135341#3841126>, @ldionne wrote:
> Interesting, I actually wasn't even aware of that C++23 feature in the 
> library. FWIW, libc++ will be more than happy to use that builtin instead of 
> trying to figure it out inside the library (if that's even possible)! We'll 
> have to check whether GCC implements it, but hopefully it has something 
> similar. So this definitely LGTM from the libc++ side of things, assuming the 
> Clang folks are happy with the implementation.

It's possible to easily implement `reference_constructs_from_temporary` in the 
library, but the converts one is far more tricky because 
`__reference_binds_to_temporary` only cares about construction. I don't know if 
GCC implements it (I thought it did, but I can't find the commit in a trivial 
Google search), but I did learn that libstdc++ has a guard for this name.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D135341/new/

https://reviews.llvm.org/D135341

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