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<?php function foo(callable $d){} foo('notAnExistingFunction');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: foo(): Argument #1 ($d) must be of type callable, string given, called in /in/3vo2j on line 4 and defined in /in/3vo2j:3 Stack trace: #0 /in/3vo2j(4): foo('notAnExistingFu...') #1 {main} thrown in /in/3vo2j on line 3
Process exited with code 255.

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