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<?php class A { public function foo(self $that) { var_dump($that); } } class B extends A { } $a = new A(); $a->foo($a); $b = new B(); $b->foo($a); $b->foo($b);
Output for git.master, git.master_jit, rfc.property-hooks
object(A)#1 (0) { } object(A)#1 (0) { } object(B)#2 (0) { }

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