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<?php declare(strict_types=1); function sum(int $a, int $b) { return $a + $b; } var_dump(sum(1, 2)); var_dump(sum("1", "5")); ?>
Output for git.master, git.master_jit, rfc.property-hooks
int(3) Fatal error: Uncaught TypeError: sum(): Argument #1 ($a) must be of type int, string given, called in /in/lPvuF on line 9 and defined in /in/lPvuF:4 Stack trace: #0 /in/lPvuF(9): sum('1', '5') #1 {main} thrown in /in/lPvuF on line 4
Process exited with code 255.

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