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<?php class x { public function m() {} } class y extends x { public function m():?string {} } $x = new x(); $y = new y(); $x->m(); $y->m();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: y::m(): Return value must be of type ?string, none returned in /in/Y1UXW:8 Stack trace: #0 /in/Y1UXW(14): y->m() #1 {main} thrown in /in/Y1UXW on line 8
Process exited with code 255.

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