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<?php function pop($f) { echo $f; } function hop(Callable $on) { if (!is_string($on)) { echo "no pat no, don't sit on that"; } } hop('pop'); hop(NULL);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: hop(): Argument #1 ($on) must be of type callable, null given, called in /in/7KC1l on line 12 and defined in /in/7KC1l:5 Stack trace: #0 /in/7KC1l(12): hop(NULL) #1 {main} thrown in /in/7KC1l on line 5
Process exited with code 255.

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