(COS_Cons): New type.
(cos_cons): New prototype.
(cos_car): New prototype.
(cos_cdr): New prototype.
COS_String cos_symbol_name (COS_Symbol symbol);
+typedef struct COS_Cons_ent COS_Cons_ent;
+typedef struct COS_Cons_ent* COS_Cons;
+
+COS_Cons cos_cons (COS_object car, COS_object cdr);
+COS_object cos_car (COS_Cons pair);
+COS_object cos_cdr (COS_Cons pair);
+
+
typedef struct COS_Container_ent COS_Container_ent;
typedef struct COS_Container_ent* COS_Container;