add_self_to_load_path

# File lib/rubygems/specification.rb, line 1568
  def add_self_to_load_path
    return if default_gem?

    paths = full_require_paths

    # gem directories must come after -I and ENV['RUBYLIB']
    insert_index = Gem.load_path_insert_index

    if insert_index then
      # gem directories must come after -I and ENV['RUBYLIB']
      $LOAD_PATH.insert(insert_index, *paths)
    else
      # we are probably testing in core, -I and RUBYLIB don't apply
      $LOAD_PATH.unshift(*paths)
    end
  end