201     PyObject *optional_vars;  member
446     Py_CLEAR(state->optional_vars);  in _PyAST_Fini()
530     if ((state->optional_vars = PyUnicode_InternFromString("optional_vars")) == NULL) return 0;  in init_identifiers()
1864     if (PyObject_SetAttr(state->withitem_type, state->optional_vars, Py_None)  in init_types()
3340 withitem(expr_ty context_expr, expr_ty optional_vars, PyArena *arena)  in withitem()  argument
3352     p->optional_vars = optional_vars;  in withitem()
4838     value = ast2obj_expr(state, o->optional_vars);  in ast2obj_withitem()
4840     if (PyObject_SetAttr(result, state->optional_vars, value) == -1)  in ast2obj_withitem()
9537     expr_ty optional_vars;  in obj2ast_withitem()  local
9552     if (_PyObject_LookupAttr(obj, state->optional_vars, &tmp) < 0) {  in obj2ast_withitem()
9557         optional_vars = NULL;  in obj2ast_withitem()
9561         res = obj2ast_expr(state, tmp, &optional_vars, arena);  in obj2ast_withitem()
9565     *out = withitem(context_expr, optional_vars, arena);  in obj2ast_withitem()