Covariance from no-type is already supported, since 7.0 https://3v4l.org/I1hZs
- [PHP-DEV][RFC] Allow void return type variance Wes
- Re: [PHP-DEV][RFC] Allow void return type varian... Claude Pache
- Re: [PHP-DEV][RFC] Allow void return type va... Wes
- Re: [PHP-DEV][RFC] Allow void return typ... Girgias
- Re: [PHP-DEV][RFC] Allow void return... Wes
- Re: [PHP-DEV][RFC] Allow void r... Girgias
- Re: [PHP-DEV][RFC] Allow vo... Wes
- Re: [PHP-DEV][RFC] Allo... Girgias
- Re: [PHP-DEV][RFC] Allo... Wes
- Re: [PHP-DEV][RFC] Allo... Girgias
- Re: [PHP-DEV][RFC] Allow void return type varian... Stanislav Malyshev
- Re: [PHP-DEV][RFC] Allow void return type varian... Kalle Sommer Nielsen
- Re: [PHP-DEV][RFC] Allow void return type varian... Rowan Collins
- Re: [PHP-DEV][RFC] Allow void return type va... Michael Wallner
- Re: [PHP-DEV][RFC] Allow void return type va... Terje BrĂ¥ten