You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: should_base.rb
    path of file: ./repos/transpec/lib/transpec/syntax/mixin
    
    the code of the file until where you have to start completion: # coding: utf-8

require 'active_support/concer
    
        def matcher_node
          if arg_node
            Util.each_forward_chained_node(arg_node, :include_origin)
              .select(&:send_type?).to_a.last
          else
            parent_node
          end