On 2014-Feb-24, includes/Exception.php' was removed from the core (git master), and replaced by a set of files under includes/exception'. See https://gerrit.wikimedia.org/r/#/c/115240/.
On 2014-Mar-24, my attempts to use `repo/maintenance/importInterlang.php' (git master) threw the following error:
PHP Fatal error: require_once(): Failed opening required '/usr/share/wp-mirror-mediawiki/includes/Exception.php' (include_path='.:/usr/share/php:/usr/share/pear') in /usr/share/wp-mirror-mediawiki/extensions/Wikidata/extensions/Wikibase/repo/maintenance/importInterlang.php on line 24
PHP Stack trace:
PHP 1. {main}() /usr/share/wp-mirror-mediawiki/extensions/Wikidata/extensions/Wikibase/repo/maintenance/importInterlang.php:0
Version: master
Severity: major
Whiteboard: u=dev c=backend p=0 s=2014-03-18