docs: def _stack_effect(op_code, oparg):
    """Compute the effect an op_code and oparg have on the stack.  See python/compile.c."""
    n_args = lambda o: (o % 256) + 2 * (o // 256)
  
    if op_code == 'DUP_TOPX':
      return oparg
    elif op_code == 'UNPACK_SEQUENCE':
      return oparg - 1
    elif op_code == 'BUILD_TUPLE':
      return -oparg  # Was 1 - oparg
    elif op_code == 'BUILD_LIST':
      return -oparg  # Was 1 - oparg
    elif op_code == 'BUILD_SET':
      return -oparg  # Was 1 - oparg
    elif op_code == 'RAISE_VARARGS':
      return -oparg
    elif op_code == 'CALL_FUNCTION':
      return -n_args(oparg)  # args + (#kwargs << 8)
    elif op_code == 'CALL_FUNCTION_VAR':
      return -n_args(oparg) - 1  # args + (#kwargs << 8)
    elif op_code == 'CALL_FUNCTION_KW':
      return -n_args(oparg) - 1  # args + (#kwargs << 8)
    elif op_code == 'CALL_FUNCTION_VAR_KW':
      return -n_args(oparg) - 2  # args + (#kwargs << 8)
    elif op_code == 'MAKE_FUNCTION':
      return -oparg
    elif op_code == 'BUILD_SLICE':
      if oparg == 3:
        return -2
      else:
        return -1
    elif op_code == 'MAKE_CLOSURE':
      return -oparg - 1
  
    return _STACK_EFFECTS[op_code]