# File activesupport/lib/active_support/dependencies/require_dependency.rb, line 11
def require_dependency(filename)
  filename = filename.to_path if filename.respond_to?(:to_path)

  unless filename.is_a?(String)
    raise ArgumentError, "the file name must be either a String or implement #to_path -- you passed #{filename.inspect}"
  end

  if abspath = ActiveSupport::Dependencies.search_for_file(filename)
    require abspath
  else
    require filename
  end
end