Last modified: 2014-07-26 09:26:59 UTC
See upstream report: https://github.com/facebook/hhvm/issues/3281 Special:Version is the only place in MediaWiki where I think get_class(Closure) is displayed to the user AFAIK. Discovered through https://gerrit.wikimedia.org/r/#/c/148922/1/includes/specials/SpecialVersion.php,cm