code: def next(self) -> "ArrayEntry":
          
          try:
              newval, naft = self.after.pop()
          except IndexError:
              raise NonexistentInstance(self.json_pointer(), "next of last") from None
          return ArrayEntry(
              self.index + 1, self.before.cons(self.value), naft, newval,
              self.parinst, self.schema_node, self.timestamp)
docs: Return an instance node corresponding to the next entry.
  
          Raises:
              NonexistentInstance: If the receiver is the last entry of the parent array.