"H. S. Teoh" <hsteoh at quickfur.ath.cx> wrote in message news:mailman.652.1331699976.4860.digitalmars-d at puremagic.com... > Is this a bug? > Nope. > int[string] aa, bb; aa == bb == null > bb = aa; same > aa["abc"] = 123; A new AA is created. > assert(bb["abc"] == 123); // assertion fails > B is still null