Wikimedia Bugzilla is closed!

Note: I've only tried this on Wikipedia.

If I enter something like {{subst:User:Foo/Bar}} or even {{CURRENTDATE}} as a
nickname and select the 'Raw signature' checkbox, I get the following error:

mOptions not defined

Backtrace:

    * GlobalFunctions.php line 652 calls wfBacktrace()
    * Parser.php line 2628 calls wfDebugDieBacktrace()
    * - line - calls Parser::braceSubstitution()
    * Parser.php line 2310 calls call_user_func()
    * Parser.php line 2398 calls Parser::replace_callback()
    * Parser.php line 3569 calls Parser::replaceVariables()
    * SpecialPreferences.php line 242 calls Parser::cleanSig()
    * SpecialPreferences.php line 118 calls PreferencesForm::savePreferences()
    * SpecialPreferences.php line 15 calls PreferencesForm::execute()
    * SpecialPage.php line 449 calls wfSpecialPreferences()
    * SpecialPage.php line 310 calls SpecialPage::execute()
    * Wiki.php line 155 calls SpecialPage::executePath()
    * Wiki.php line 47 calls MediaWiki::initializeSpecialCases()
    * index.php line 134 calls MediaWiki::initialize()
    * index.php line 3 calls require()