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<?php function foo(Callable $a) { var_dump($a); } foo('var_dump'); foo(NULL);
Output for git.master, git.master_jit, rfc.property-hooks
string(8) "var_dump" Fatal error: Uncaught TypeError: foo(): Argument #1 ($a) must be of type callable, null given, called in /in/7hB4e on line 7 and defined in /in/7hB4e:2 Stack trace: #0 /in/7hB4e(7): foo(NULL) #1 {main} thrown in /in/7hB4e on line 2
Process exited with code 255.

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