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<?php function sum(array $ints): int { array_walk($ints, function(int $int) {}); $a = 0; foreach ($ints as $int) { $a += $int; } return $a; } var_dump(sum([1, 2, 3])); var_dump(sum([1, 2, "three"]));
Output for git.master, git.master_jit, rfc.property-hooks
int(6) Fatal error: Uncaught TypeError: {closure}(): Argument #1 ($int) must be of type int, string given in /in/TRTF9:5 Stack trace: #0 [internal function]: {closure}('three', 2) #1 /in/TRTF9(5): array_walk(Array, Object(Closure)) #2 /in/TRTF9(14): sum(Array) #3 {main} thrown in /in/TRTF9 on line 5
Process exited with code 255.

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