class Sass::Value::List

def initialize(contents = [], separator: ',', bracketed: false) # rubocop:disable Lint/MissingSuper
  if separator.nil? && contents.length > 1
    raise error 'A list with more than one element must have an explicit separator'
  end
  @contents = contents.freeze
  @separator = separator.freeze
  @bracketed = bracketed.freeze
end