1--TEST--
2Creating the stream filter object may fail
3--FILE--
4<?php
5class SampleFilter extends php_user_filter {
6    private $data = \FOO;
7}
8stream_filter_register('sample.filter', SampleFilter::class);
9try {
10    var_dump(file_get_contents('php://filter/read=sample.filter/resource='. __FILE__));
11} catch (Error $e) {
12    echo $e->getMessage(), "\n";
13}
14?>
15--EXPECTF--
16Warning: file_get_contents(): Unable to create or locate filter "sample.filter" in %s on line %d
17
18Warning: file_get_contents(): Unable to create filter (sample.filter) in %s on line %d
19Undefined constant "FOO"
20