class RuboCop::Cop::Rails::RootPathnameMethods

def join_arguments(arguments)
  use_interpolation = false
  joined_arguments = arguments.map do |arg|
    if arg.respond_to?(:value)
      arg.value
    else
      use_interpolation = true
      "\#{#{arg.source}}"
    end
  end.join('/')
  quote = enforce_double_quotes? || include_interpolation?(arguments) || use_interpolation ? '"' : "'"
  "#{quote}#{joined_arguments}#{quote}"
end