class Sass::BaseEnvironment

def initialize(parent = nil, options = nil)
  @parent = parent
  @options = options || (parent && parent.options) || {}
  @stack = @parent.nil? ? Sass::Stack.new : nil
  @caller = nil
  @content = nil
  @filename = nil
  @functions = nil
  @mixins = nil
  @selector = nil
  @vars = nil
end