code: def test_idx(self):
      code = """
  def idx(x):
      def id(xi): return xi
      return list(map(id, x))"""
      self.run_test(code, [1, 2, 3], idx=[List[int]])
  
imports: from pythran.tests import TestEnv
  from pythran.typing import *
label_desc: Use image node_id 10 for calling the TestCopperhead obj's underlying member method code with example usage: obj.test_idx() without return types