SCM ly_assoc_prepend_x (SCM alist, SCM key, SCM val);
inline bool ly_is_list (SCM x) { return scm_is_true (scm_list_p (x)); }
SCM ly_assoc_prepend_x (SCM alist, SCM key, SCM val);
inline bool ly_is_list (SCM x) { return scm_is_true (scm_list_p (x)); }