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<?php function arraysSum(array $arrays): array { return array_map(function(array $array): int { return array_sum($array); }, $arrays); } print_r(arraysSum([1,2,3], [4,5,6], [7,8,9]));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: {closure}(): Argument #1 ($array) must be of type array, int given in /in/IV8qs:4 Stack trace: #0 [internal function]: {closure}(1) #1 /in/IV8qs(4): array_map(Object(Closure), Array) #2 /in/IV8qs(9): arraysSum(Array, Array, Array) #3 {main} thrown in /in/IV8qs on line 4
Process exited with code 255.

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