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<?php class A { use C; public function __construct($foo) { $this->__init($foo); } } class B extends A { } trait C { private $foo; private function __init($foo) { $this->foo = $foo; } } $test = new B('bar'); print_r($test);
Output for git.master, git.master_jit, rfc.property-hooks
B Object ( [foo:A:private] => bar )

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