code: def succ!
        raise IndexError.new("Location #{qp} container not set") unless @container
        raise IndexError.new("Location #{qp} coordinate not set") unless @coordinate
        c = column.succ % @container.capacity.columns
        r = c.zero? ? row.succ : row
        unless r < container.capacity.rows then
          raise IndexError.new("Location #{[c, r].qp} exceeds #{@container} container capacity #{container.capacity.bounds}")
        end
        @coordinate.x = c
        @coordinate.y = r
        self
      end
docs: Sets this Location to the next slot in this Location's {#container}.
  
   @raise [IndexError] if the next slot exceeds the container capacity
   @return self