Read the
In the execution this is an array access, but the logical definition is just a thin wrapper for nth:
Function:
(defun sdominfos$ai (stobjs::i obs-sdom-array$a) (declare (xargs :guard (and (obs-sdom-array$ap obs-sdom-array$a) (integerp stobjs::i) (<= 0 stobjs::i) (< stobjs::i (sdominfos$a-length obs-sdom-array$a))))) (ec-call (obs-sdom-info-fix (ec-call (nth stobjs::i obs-sdom-array$a)))))