code: def test_tir_op_call_undef():
      expr = tir.undef()
      assert expr.op.name == "tir.undef"
  
imports: import tvm
  import tvm.testing
  from tvm import tir
label_desc: Use image node_id 9 for calling a global function with example usage: test_tir_op_call_undef() without return types