php-src/ext/intl/tests/bug72639.phpt

--TEST--
Bug #72639 (Segfault when instantiating class that extends IntlCalendar and adds a property)
--EXTENSIONS--
intl
--FILE--
<?php
class A extends IntlCalendar {
    public function __construct() {}
    private $a;
}
var_dump(new A());
?>
--EXPECTF--
object(A)#%d (1) {
  ["valid"]=>
  bool(false)
}