Prism::DotVisitor#visit_undef_node

# File tmp/rubies/ruby-4.0.0/lib/prism/dot_visitor.rb, line 4351
    def visit_undef_node(node)
      table = Table.new("UndefNode")
      id = node_id(node)

      # names
      if node.names.any?
        table.field("names", port: true)

        waypoint = "#{id}_names"
        digraph.waypoint("#{waypoint};")

        digraph.edge("#{id}:names -> #{waypoint};")
        node.names.each { |child| digraph.edge("#{waypoint} -> #{node_id(child)};") }
      else
        table.field("names", "[]")
      end

      # keyword_loc
      table.field("keyword_loc", location_inspect(node.keyword_loc))

      digraph.nodes << <<~DOT
        #{id} [
          label=<#{table.to_dot.gsub(/\n/, "\n  ")}>
        ];
      DOT

      super
    end