Re: [RFC] [Discussion] Never parameters

On Mon, Mar 10, 2025 at 12:07 PM Daniel Scherzer < daniel.e.scherzer@gmail.com> wrote: > Hi internals, > > I'd like to start discussion on a new RFC about allowing > never for > parameter types when declaring a method. > > * RFC: https://wiki.php.net/rfc/never-parameters-v2 > * Implementation: https://github.com/php/php-src/pull/18016 > > -Daniel > Hi Daniel, I believe this feature essentially amounts to "add methods which can never be called", which in my mind makes no sense. If a method types against an interface, and that interface uses a method with a never parameter type, then we cannot actually call that method. We'd need to know the specific concrete type, which defeats the purpose of using an interface in the first place. See note from Nikita [1] from previous discussion which expands on this idea more, and shows that generics is really what we need here. [1] https://externals.io/message/115712#115719 Best regards, --Matthew