Created attachment 144549 [details]
class that exhibits the bug

I have code to talk to avahi with an async method as:
group.AddService(
                    -1, //IF_UNSPEC,
                    -1, //PROTO_UNSPEC,
                    (uint32)0,  //flags
                    service_name, "_http._tcp",
                    "", "", // Domain and host are local
                    (uint16)80
                     , ""// service TXT
                    );

This gets translated to:
void _dynamic_AddService5 (DBusGProxy* self, gint param1, gint param2, guint32
param3, const char* param4, const char* param5, const char* param6, const char*
param7, guint16 param8, const char* param9, GError** error) {
    dbus_g_proxy_call (self, "AddService", error, G_TYPE_INT, param1,
G_TYPE_INT, param2, G_TYPE_UINT, param3, G_TYPE_STRING, param4, G_TYPE_STRING,
param5, G_TYPE_STRING, param6, G_TYPE_STRING, param7, TYPE_UINT16, param8,
G_TYPE_STRING, param9, G_TYPE_INVALID, G_TYPE_INVALID);
    if (*error) {
        return;
    }
}

Notice that I get TYPE_UINT16 instead of G_TYPE_UINT16.

I tried to use ushort in vala but that just got eliminated.

Attached is the full class. It happens in 0.7.6 and 0.7.7.