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<?php function a(string $a) { var_dump($a); } a(1); a(false); a(null);
Output for git.master, git.master_jit, rfc.property-hooks
string(1) "1" string(0) "" Fatal error: Uncaught TypeError: a(): Argument #1 ($a) must be of type string, null given, called in /in/nbO3s on line 10 and defined in /in/nbO3s:3 Stack trace: #0 /in/nbO3s(10): a(NULL) #1 {main} thrown in /in/nbO3s on line 3
Process exited with code 255.

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