class Prism::DotVisitor

def visit_singleton_class_node(node)

Visit a SingletonClassNode node. 
def visit_singleton_class_node(node)
  table = Table.new("SingletonClassNode")
  id = node_id(node)
  # locals
  table.field("locals", node.locals.inspect)
  # class_keyword_loc
  table.field("class_keyword_loc", location_inspect(node.class_keyword_loc))
  # operator_loc
  table.field("operator_loc", location_inspect(node.operator_loc))
  # expression
  table.field("expression", port: true)
  digraph.edge("#{id}:expression -> #{node_id(node.expression)};")
  # body
  unless (body = node.body).nil?
    table.field("body", port: true)
    digraph.edge("#{id}:body -> #{node_id(body)};")
  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