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<?php class X {} class Y extends X {} interface InterfaceA { function beMyself(X $a);//: self; } class ClassA implements InterfaceA { function beMyself(Y $a) //: self { return $this; } } var_dump((new ClassA)->beMyself());
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of ClassA::beMyself(Y $a) must be compatible with InterfaceA::beMyself(X $a) in /in/6sk1i on line 14
Process exited with code 255.

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