ceylon/ceylon-ide-eclipse — comment on commit 457a36e9a551f87c9fc234db14c991229ec42f59
File: plugins/com.redhat.ceylon.eclipse.ui/src/com/redhat/ceylon/eclipse/imp/builder/CeylonBuilder.java line 377
By davidfestal:

It seems to be that if it is a ceylon source folder that was part of the initial ceylon model build, there will be a package object corresponding to the folder resource (at least the default package or a package in the default module)