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<?php interface A { function m(B $s): self; } class B implements A { function m(self $s): parent { return $this; } } class C extends B { function m(parent $s): A { return $this; } } $c = new C(); $r = $c->m($c); var_dump($r instanceof C);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Cannot use "parent" when current class scope has no parent in /in/Od72V on line 8
Process exited with code 255.

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