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<?php class A {} function f(A $a): A { $a->v = 12; return $a; } $a = new A(); $a->v = 3; f($a); echo $a->v;
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Creation of dynamic property A::$v is deprecated in /in/8hQqd on line 11 12

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