1--TEST--
2fiber.stack_size must be a positive number
3--FILE--
4<?php
5ini_set("fiber.stack_size","-1");
6$fiber = new Fiber(function() {});
7try {
8    $fiber->start();
9} catch (Throwable $e) {
10	echo "Exception: " . $e->getMessage()."\n";
11}
12?>
13DONE
14--EXPECTF--
15Warning: fiber.stack_size must be a positive number in %snegative_stack_size.php on line 2
16DONE
17