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<?php function f(string $s) {return $s;}; $v = null; echo f($v);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: f(): Argument #1 ($s) must be of type string, null given, called in /in/WXk0E on line 4 and defined in /in/WXk0E:2 Stack trace: #0 /in/WXk0E(4): f(NULL) #1 {main} thrown in /in/WXk0E on line 2
Process exited with code 255.

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