```ruby
# Adapted from the rails3 compatibility shim in Haml 2.2
module Formtastic
  module Util
    extend self
    ## Rails XSS Safety

    # Returns the given text, marked as being HTML-safe.
    # With older versions of the Rails XSS-safety mechanism,
    # this destructively modifies the HTML-safety of `text`.
    #
    # @param text [String]
    # @return [String] `text`, marked as HTML-safe
    def html_safe(text)
      return text if text.nil?
      return text.html_safe if defined?(ActiveSupport::SafeBuffer)
      return text.html_safe! if text.respond_to?(:html_safe!)
      text
    end

    def rails_safe_buffer_class
      return ActionView::SafeBuffer if defined?(ActionView::SafeBuffer)
      ActiveSupport::SafeBuffer
    end

  end
end
```

Fix a deprecation warning in Rails 2.3.6 and newer
user
```ruby
# Adapted from the rails3 compatibility shim in Haml 2.2
module Formtastic
  module Util
    extend self
    ## Rails XSS Safety

    # Returns the given text, marked as being HTML-safe.
    # With older versions of the Rails XSS-safety mechanism,
    # this destructively modifies the HTML-safety of `text`.
    #
    # @param text [String]
    # @return [String] `text`, marked as HTML-safe
    def html_safe(text)
      return text if text.nil?
      return text.html_safe if defined?(ActiveSupport::SafeBuffer)
      return text.html_safe! if text.respond_to?(:html_safe!)
      text
    end

    def rails_safe_buffer_class
      # It's important that we check ActiveSupport first,
      # because in Rails 2.3.6 ActionView::SafeBuffer exists
      # but is a deprecated proxy object.
      return ActiveSupport::SafeBuffer if defined?(ActiveSupport::SafeBuffer)
      return ActionView::SafeBuffer
    end

  end
end
```
assistant