P2170 Feedback on implementing the proposed std::error type

[wg21bot]

P2170R0 Feedback on implementing the proposed std::error type (Charles Salvia)

[brycelelbach]

This is feedback on P1028 (std::error) and P0709 (zero-overhead deterministic exceptions), which is currently marked as needs-revision. This paper should be seen the next time that P1028 is seen. Marking as needs-revision until then.