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--TEST--
preg_replace_callback() should not leak persistent memory on fatal error
--FILE--
<?php
function test() {}
preg_replace_callback('/a/', function($matches) {
preg_replace_callback('/x/', function($matches) {
function test() {} // Trigger a fatal error.
return 'y';
}, 'x');
return 'b';
}, 'a');
?>
--EXPECTF--
Fatal error: Cannot redeclare test() (previously declared in %s on line %d
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