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<?php abstract class I { abstract public function qwer(); } abstract class A { public function asdf(I $a) { $a->qwer(); } } class C extends I { public function qwer() { echo "yep"; } } class B extends A { public function asdf(C $asdf) { parent::asdf($asdf); } } $par = new C(); (new B())->asdf($par);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of B::asdf(C $asdf) must be compatible with A::asdf(I $a) in /in/lcX6p on line 21
Process exited with code 255.

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