code: def test_mi_unaligned_base():
      """Returning an offset (non-first MI) base class pointer should recognize the instance"""
  
      n_inst = ConstructorStats.detail_reg_inst()
  
      c = m.I801C()
      d = m.I801D()
      # + 4 below because we have the two instances, and each instance has offset base I801B2
      assert ConstructorStats.detail_reg_inst() == n_inst + 4
      b1c = m.i801b1_c(c)
      assert b1c is c
      b2c = m.i801b2_c(c)
      assert b2c is c
      b1d = m.i801b1_d(d)
      assert b1d is d
      b2d = m.i801b2_d(d)
      assert b2d is d
  
      assert (
          ConstructorStats.detail_reg_inst() == n_inst + 4
      )  # no extra instances
      del c, b1c, b2c
      assert ConstructorStats.detail_reg_inst() == n_inst + 2
      del d, b1d, b2d
      assert ConstructorStats.detail_reg_inst() == n_inst
  
imports: import pytest
  import env
  from pybind11_tests import ConstructorStats
  from pybind11_tests import multiple_inheritance
label_desc: Use image node_id 9 for calling a global function with example usage: test_mi_unaligned_base() without return types