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<?php abstract class x { function test($z, x $x) { var_dump($x); } } class y extends x { function test($z, $x = null) { parent::test($x, $x); } } (new y)->test(null);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: x::test(): Argument #2 ($x) must be of type x, null given, called in /in/45tDp on line 13 and defined in /in/45tDp:4 Stack trace: #0 /in/45tDp(13): x->test(NULL, NULL) #1 /in/45tDp(17): y->test(NULL) #2 {main} thrown in /in/45tDp on line 4
Process exited with code 255.

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