1--TEST-- 2Arguments to fiber callback 3--FILE-- 4<?php 5 6$fiber = new Fiber(function (int $x): int { 7 return $x + Fiber::suspend($x); 8}); 9 10$x = $fiber->start(1); 11$fiber->resume(0); 12var_dump($fiber->getReturn()); 13 14$fiber = new Fiber(function (int $x): int { 15 return $x + Fiber::suspend($x); 16}); 17 18$fiber->start('test'); 19 20?> 21--EXPECTF-- 22int(1) 23 24Fatal error: Uncaught TypeError: {closure}(): Argument #1 ($x) must be of type int, string given in %sstart-arguments.php:%d 25Stack trace: 26#0 [internal function]: {closure}('test') 27#1 %sstart-arguments.php(%d): Fiber->start('test') 28#2 {main} 29 thrown in %sstart-arguments.php on line %d 30