Is there any reason that the following line of code in an extension would give me a 500 error?
$contentRenderer = MediaWikiServices::getInstance()->getContentRenderer();
I wonder whether it's my MW version (1.35.8) or maybe something else about how things are set up on my wiki.
Further details at Extension_talk:Cargo#RSS:_Does_"feed"_export_display_format_work_with_MW1.35?.
Thanks.