{"ast_node_type":"variable","tokens":[{"end":95,"kind":"keyword","start":0,"text":"if"}]}
                    if let Some(sp) = this.psess.ambiguous_block_expr_parse.borrow().get(&lo) {
                    // then suggest parens around the lhs.
                        err.subdiagnostic(ExprParenthesesNeeded::surrounding(*sp));