Vala 0.7.4 fails to compile code using the ModuleInit attribute.

To see the problem, try to build the following plugin sample code (from http://live.gnome.org/Vala/TypeModules):

== plugin-interface.vala ==

using GLib;

public abstract class TestPlugin : Object {
        public abstract void hello();
}

== plugin.vala ==

using GLib;

class MyPlugin : TestPlugin {
        public override void hello() {
                stdout.printf("Hello world!\n");
        }
}

[ModuleInit]
public Type register_plugin (TypeModule module) {
        // types are registered automatically
        return typeof (MyPlugin);
}

====

% valac -g -C plugin.vala plugin-interface.vala
% gcc -g -shared -fPIC $(pkg-config --cflags --libs glib-2.0) -o libplugin.so plugin.c

With Vala 0.7.3 or earlier, this works fine.  Vala 0.7.4 yields the following error:

plugin.c: In function ‘my_plugin_get_type’:
plugin.c:105: error: ‘my_plugin_type_id’ undeclared (first use in this function)
plugin.c:105: error: (Each undeclared identifier is reported only once
plugin.c:105: error: for each function it appears in.)
plugin.c: In function ‘my_plugin_register_type’:
plugin.c:111: error: ‘my_plugin_type_id’ undeclared (first use in this function)