On Thursday, 20 March 2025 at 16:57, Larry Garfield <la...@garfieldtech.com>
wrote:
> On Thu, Mar 20, 2025, at 11:24 AM, Gina P. Banyard wrote:
>
> > As the person that had the initial discussion in R11 with Jordan [1]
> > never as a parameter type for an interface actually is not the solution
> > for "poor man generics".
> > Matthew Fonda [2] already replied to the thread pointing out the remark
> > Nikita made in the discussion of the previous RFC.
> > But importantly, going from mixed parameter type to a generic parameter
> > type is allowed and not a BC change,
> > however, going from a never parameter type to a generic parameter type
> > is a BC break.
>
>
> To clarify, you're saying this:
>
> [...]
>
> Am I following that? Because just from writing that I am not sure I agree,
> which means I may be misunderstanding. :-)
I am saying:
interface I {
pubic function foo(never $a);
}
can ***not*** be "upgraded" to
interface I<A> {
pubic function foo(A $a);
}
whereas it is possible to go from
interface I {
pubic function foo(mixed $a);
}
to
interface I<A> {
pubic function foo(A $a);
}
The implementing classes are completely irrelevant in this context.
Best regards,
Gina P. Banyard
