xo-alloc2 xo-object: bugfix + refactor -> IGCObject_DList builds

include/xo/object2/DList.hpp

@@ -0,0 +1,26 @@
+/** @file DList.hpp
+ *
+ *  @author Roland Conybeare, Dec 2025
+ **/
+
+#include "xo/alloc2/RGCObject.hpp"
+#include "xo/alloc2/IGCObject_Any.hpp"
+#include "xo/facet/obj.hpp"
+
+namespace xo {
+    namespace scm {
+
+        struct DList {
+            using AGCObject = xo::mm::AGCObject;
+
+            DList(xo::obj<AGCObject> h,
+                  xo::obj<AGCObject> r) : head_{h}, rest_{r} {}
+
+            obj<AGCObject> head_;
+            obj<AGCObject> rest_;
+        };
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end DList.hpp */