new_contents: def inline(fn):
      """
      decorator used to call a function in place
      similar to JS `var user_id = (function () { ... }());`
  
      example:
  
          @inline
          def user_id():
              if request.couch_user.is_commcare_user():
                  return request.couch_user.get_id
              else:
                  return request.GET.get('user_id')
  
      """
      return fn()
  
subject: add inline decorator