docs: def render_impl(**kwargs):
      """
      :param tmpl: Template content string or file
      :param at_paths: Template search paths
      """
      if Template is None:
          tmpl = kwargs.get("file", None)
          if tmpl is None:
              tmpl = kwargs.get("source", None)
              return anytemplate.engines.base.fallback_renders(tmpl)
  
          return anytemplate.engines.base.fallback_render(tmpl, None, **kwargs)
  
      return Template(**kwargs).respond()