I believe you can only list one class per frame. That class can in turn
bring in other classes via its compile-time dependencies.
hm, so that would mean, the documentation is not correct?
Possibly. I'm not on the compiler team and it would take a while to figure
it out. If comma and spaces didn't work, then the doc is probably wrong.
If you file a bug, the doc team will figure it out.
I've only used it for a single main class per-frame (that can pull in other
classes as needed). IIRC, there is a contract with that single main class
so I don't think there can be more than one per frame, but I could be wrong.