Hi,
currently the memory managment features of vala are not applied to class fields. These should be cleaned up in class/base_finalize.

Example:

public class Test : GLib.Object {
  private class Foo foo = new Foo();
}

public class Foo : GLib.Object {

}

public void main() {
  new Test ();
}


Here the foo instance should be cleaned up in class_finalize. It might be a problem to detect where to clean up though, if fields are assigned a) from instance/class/virtual methods or static ctors they should be cleaned up in base_finalize of the corresponding class and b) if they're set in static methods, class ctors or are directly initialized (above example) they should be cleaned up in the class_finalize of the corresponding class.