Last modified: 2012-04-19 21:22:17 UTC
If wgLegacyJavaScriptGlobals is set to false then wgCascadeableLevels is not in mw.config at all. I'm doing a clean up of several Html::inlineScipt uses today, I'll assign this one to me as a reminder. Bug can be reproduced in any version that has wgLegacyJavaScriptGlobals (added in r87856 - 1.18)
Fixed as part of the clean up in r98379.