{"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"let"}]}
                                    let in_expr = self.collect_expr_opt(op_expr.in_expr());
                                    let Some(op_expr) = op.asm_operand_expr() else { continue };
                                    match op_expr.fat_arrow_token().is_some() {