Mark de Wever f9aa7a20d9
[libc++] Verify std::forward_like's mandates clause. (#127318)
The existing using _ForwardLike declaration already fails with a
subsitution failure. The LWG issue was filed to clarify what should
happen for non-referencable types.

Added test to verify libc++ is already enforcing the new Mandates.

Implements:
- LWG3757 What's the effect of std::forward_like<void>(x)

Closes: #105026
2025-03-26 20:53:30 -04:00
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