Please describe the problem:
In the generated code, nested structs or classes are only fully defined AFTER the containing class. 

A preliminary declaration is generated before:
typedef struct _PhoneUIGladewindow_widgets PhoneUIGladewindow_widgets;

so for classes, which are implemented as pointers, this is not fatal.
But for nested structs, the generated C code fails to compile with "incomplete type error"

Steps to reproduce:
Compile this code:
----
using GLib;
using Gtk;
using Glade;

public class PhoneUIGlade : Gtk.Object {
    protected Glade.XML xml;
    protected struct window_widgets {
    protected Gtk.Widget blah;
    protected Gtk.Widget blah2;
    }
    protected window_widgets widgets;
}
----
like this:
valac --pkg gtk+-2.0 --pkg libglade-2.0 --pkg gmodule-2.0 --basedir . FILE.vala

and observe the error. Compile like this to look in the generated header file:
valac -C --pkg gtk+-2.0 --pkg libglade-2.0 --pkg gmodule-2.0 --basedir . FILE.vala


Actual results:
Compilation fails

Expected results:
Success, with the struct definition occuring before the class which holds it.

Does this happen every time?
every darn toonin' time

Other information: