--TEST--
Fast finishing fiber does not leak
--EXTENSIONS--
fiber
--FILE--
<?php

$fiber = new Fiber(fn() => 'test');
var_dump($fiber->isStarted());
var_dump($fiber->start());
var_dump($fiber->getReturn());
var_dump($fiber->isTerminated());

?>
--EXPECTF--
bool(false)
NULL
string(4) "test"
bool(true)