{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"self.convert_place_op_to_mutable(PlaceOp::Index,"}]}
                    self.convert_place_op_to_mutable(PlaceOp::Index, expr, base_expr);
                hir::ExprKind::Index(base_expr, ..) => {
                }