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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())), '' . $a(null);;
Output for git.master, git.master_jit, rfc.property-hooks
a0a1 Fatal error: Uncaught TypeError: {closure}(): Return value must be of type A0, null returned in /in/V1tdo:5 Stack trace: #0 /in/V1tdo(7): {closure}(NULL) #1 {main} thrown in /in/V1tdo on line 5
Process exited with code 255.

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