Prism::DotVisitor#visit_nil_node

# File tmp/rubies/ruby-4.0.0/lib/prism/dot_visitor.rb, line 3382
    def visit_nil_node(node)
      table = Table.new("NilNode")
      id = node_id(node)

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

      super
    end