US 18-050 7.7 [expr.const] consteval rules

[wg21bot]

consteval is currently highly limited in functionality and ability to integrate with existing code due to the very strict nature of what can be called when. The current rules basically obviate all of the potential benefits of value-based reflection, since you can’t use any algorithms anyway.

Proposed change:

Adopt P2564 as a DR.

[jfbastien]

Duplicate https://github.com/cplusplus/nbballot/issues/467

[erichkeane]

No objection to unanimous consent that this is a duplicate as stated above.