P2251 Require span & basic_string_view to be Trivially Copyable

[wg21bot]

P2251R0 Require span & basic_string_view to be Trivially Copyable (Nevin Liber)

[cor3ntin]

@brycelelbach I think this should go straight to LEWG, no point in mailing list review

[cor3ntin]

@brycelelbach or LWG directly - It seems to be a lwg issue to me

[nliber]

When I brought it up in LWG, they wanted it run by LEWG, hence this small paper.

[cor3ntin]

@nliber Oh. I will send it directly to bryce, nothing we can do on the mailing