class SassC::Script::Value::List

def element_needs_parens?(element)
  if element.is_a?(List)
    return false if element.value.length < 2
    return false if element.bracketed
    precedence = Sass::Script::Parser.precedence_of(separator || :space)
    return Sass::Script::Parser.precedence_of(element.separator || :space) <= precedence
  end
  return false unless separator == :space
  return false unless element.is_a?(Sass::Script::Tree::UnaryOperation)
  element.operator == :minus || element.operator == :plus
end