code: def test_experimental(recwarn: WarningsRecorder) -> None:
      @experimental
      def f() -> None:
          pass
  
      assert len(recwarn) == 0  # pylint: disable=len-as-condition
      f()
      assert len(recwarn) == 1
      f()
      assert len(recwarn) == 1
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_experimental(recwarn) without return types