[libcxx-commits] [libcxx] [libc++] Verifies std::forward_like's mandates clause. (PR #127318)

[Mark de Wever via libcxx-commits]

mordante wrote:

> Can't we test all of this with SFINAE tests instead?

I don't think we can. With SFINAE we test a constraint clause and this is a mandates clause. 

https://github.com/llvm/llvm-project/pull/127318