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

[Nikolas Klauser via libcxx-commits]

philnik777 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.

Yeah, I'm actually not convinced this is "nothing to do". We're currently SFINAEing away AFAICT, but the standard asks us to reject the code out right.

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