In D9855#6, @epriestley wrote:

Yeah, Diviner can figure out @group from configuration now. It's still parsed, but only useful to override the defaults if some file has an unusual grouping for some reason (which nothing in these libraries should, I think).

Is there an easy way to identify these?

I don't have any way to identify them if they do exist. They would have to be weird edge cases that I annotated and then forgot about. If there are any, they're so rare that it's not worth trying to find them. We can add them back if necessary later, but more likely we'd just want to move the code now.

The only case like this that I can think of is all the stuff that used to live in libphutil/src/__phutil_library_init__.php -- moving it out was clearly a better approach.