235     Py_CLEAR(state->optional_vars);  in _PyAST_Fini()
334     if ((state->optional_vars = PyUnicode_InternFromString("optional_vars")) == NULL) return 0;  in init_identifiers()
1763     if (PyObject_SetAttr(state->withitem_type, state->optional_vars, Py_None)  in init_types()
3355 _PyAST_withitem(expr_ty context_expr, expr_ty optional_vars, PyArena *arena)  in _PyAST_withitem()  argument
3367     p->optional_vars = optional_vars;  in _PyAST_withitem()
5095     value = ast2obj_expr(state, o->optional_vars);  in ast2obj_withitem()
5097     if (PyObject_SetAttr(result, state->optional_vars, value) == -1)  in ast2obj_withitem()
10818     expr_ty optional_vars;  in obj2ast_withitem()  local
10837     if (_PyObject_LookupAttr(obj, state->optional_vars, &tmp) < 0) {  in obj2ast_withitem()
10842         optional_vars = NULL;  in obj2ast_withitem()
10849         res = obj2ast_expr(state, tmp, &optional_vars, arena);  in obj2ast_withitem()
10854     *out = _PyAST_withitem(context_expr, optional_vars, arena);  in obj2ast_withitem()