If you nest an event, such as:
public class bug {
public void event E {}
}
then you get several issues, where trying to reference the event gives:
error: package E does not exist
Moving the class bug into a package, and then doing 'import pkg.bug.*;' and only referencing the event as 'E' works fine.
If you try to qualify it as 'pkg.bug.E' you still get:
error: package E does not exist