SCM args = evaluate_args (delayed_argument, scm_cdr (expr), pure, start, end);
if (args == SCM_UNSPECIFIED)
return SCM_UNSPECIFIED;
SCM args = evaluate_args (delayed_argument, scm_cdr (expr), pure, start, end);
if (args == SCM_UNSPECIFIED)
return SCM_UNSPECIFIED;