{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"if"}]}
                    if i == 0 || matches!(fmt.template[i - 1], FormatArgsPiece::Placeholder(_)) {
                    // Inject empty string before placeholders when not already preceded by a literal piece.
                        Some(ctx.expr_str(fmt.span, sym::empty))