{"ast_node_type":"import","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
                        // FIXME: expressions in curly brackets can cause ambiguity after insertion
                    if let Some(expr) = v.expr() {
                        // (e.g. `N * 2` -> `{1 + 1} * 2`; it's unclear whether `{1 + 1}`