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: c.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/rdoc-4.3.0/lib/rdoc/parser
    
    the code of the file until where you have to start completion: require 'tsort'

##
# RDoc::Parser::C attempts to parse C extension files.  It looks for
# the standard patterns that you find in exten
    
  def handle_constants(type, var_name, const_name, definition)
    class_name = @known_classes[var_name]

    return unless class_name

    class_obj = find_class var_name, class_name

    unless class_obj then
      @options.warn 'Enclosing class or module %p is not known' % [const_name]
      return
    end