+SCM
+nested_property (SCM alist, SCM prop_path, SCM fallback)
+{
+ for (; scm_is_pair (prop_path); prop_path = scm_cdr (prop_path))
+ {
+ SCM tail = assoc_tail (scm_car (prop_path), alist);
+ if (scm_is_false (tail))
+ return fallback;
+ alist = scm_cdar (tail);
+ }
+ return alist;
+}
+