class Kramdown::Parser::Kramdown

def parse_link_definition
  @src.pos += @src.matched_size
  link_id, link_url, link_title = @src[1].downcase, @src[2] || @src[3], @src[5]
  warning("Duplicate link ID '#{link_id}' - overwriting") if @doc.parse_infos[:link_defs][link_id]
  @doc.parse_infos[:link_defs][link_id] = [link_url, link_title]
  true
end