class Asciidoctor::AbstractBlock

def next_adjacent_block

item in a list, this method will return the following sibling of the list block.
Move to the next adjacent block in document order. If the current block is the last 
def next_adjacent_block
  unless @context == :document
    if (p = @parent).context == :dlist && @context == :list_item
      (sib = p.items[(p.items.find_index {|terms, desc| (terms.include? self) || desc == self }) + 1]) ? sib : p.next_adjacent_block
    else
      (sib = p.blocks[(p.blocks.find_index self) + 1]) ? sib : p.next_adjacent_block
    end
  end
end