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<?php class A0 { public function __toString() { return 'a0'; } }; class A1 extends A0 { public function __toString() { return 'a1'; } }; $a = function ($a) : A0 {return $a;}; echo '' . $a((new A0())), '' . $a((new A1()));
Output for git.master, git.master_jit, rfc.property-hooks
a0a1

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