;;;; nth was an alias of at, and an asymmetric one: the checker accepted it as
;;;; a read, but parse.ml and place_of_expr both match only [at], so
;;;; (set (nth a i) x) and (addr (nth a i)) were refused while the [at] forms
;;;; worked. Two names documented as identical that disagree about writing are
;;;; worse than one name, so nth is gone and this pins the removal: it must
;;;; fail as an unknown name, not quietly resolve to at again.

(defvar a [4 i32])

(defn main [] i32
  (nth a 0))