class Prism::DotVisitor

def visit_for_node(node)

Visit a ForNode node. 
def visit_for_node(node)
  table = Table.new("ForNode")
  id = node_id(node)
  # index
  table.field("index", port: true)
  digraph.edge("#{id}:index -> #{node_id(node.index)};")
  # collection
  table.field("collection", port: true)
  digraph.edge("#{id}:collection -> #{node_id(node.collection)};")
  # statements
  unless (statements = node.statements).nil?
    table.field("statements", port: true)
    digraph.edge("#{id}:statements -> #{node_id(statements)};")
  end
  # for_keyword_loc
  table.field("for_keyword_loc", location_inspect(node.for_keyword_loc))
  # in_keyword_loc
  table.field("in_keyword_loc", location_inspect(node.in_keyword_loc))
  # do_keyword_loc
  unless (do_keyword_loc = node.do_keyword_loc).nil?
    table.field("do_keyword_loc", location_inspect(do_keyword_loc))
  end
  # end_keyword_loc
  table.field("end_keyword_loc", location_inspect(node.end_keyword_loc))
  digraph.nodes << <<~DOT
    #{id} [
      label=<#{table.to_dot.gsub(/\n/, "\n  ")}>
    ];
  DOT
  super
end