extern bool constraintList_empty (/*@sef@*/ constraintList);
# define constraintList_empty(s) (constraintList_size(s) == 0)
-extern /*@falsenull@*/ bool constraintList_isDefined (constraintList p_t);
+extern /*@falsewhennull@*/ bool constraintList_isDefined (constraintList p_t);
# define constraintList_isDefined(s) ((s) != (constraintList) 0)
extern /*@only@*/ constraintList constraintList_makeNew(void);