[libcxx-commits] [libcxx] [libc++] Implement P2538R1 "ADL-proof std::projected" (PR #65411)

[via libcxx-commits]

https://github.com/EricWF requested changes to this pull request.

I don' think this builds.

```
include/c++/v1/__iterator/projected.h:49:8: error: class template partial specialization contains template parameters that cannot be deduced; this partial specialization will never be used [-Wunusable-partial-specialization]
   49 | struct incrementable_traits<projected<_It, _Proj>> {
```



https://github.com/llvm/llvm-project/pull/65411