class SassC::Script::Value::Map

def to_sass(opts = {})
  return "()" if value.empty?
  to_sass = lambda do |value|
    if value.is_a?(List) && value.separator == :comma
      "(#{value.to_sass(opts)})"
    else
      value.to_sass(opts)
    end
  end
  "(#{value.map {|(k, v)| "#{to_sass[k]}: #{to_sass[v]}"}.join(', ')})"
end