{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"this.mark_span_with_reason(DesugaringKind::WhileLoop,"}]}
                            this.mark_span_with_reason(DesugaringKind::WhileLoop, e.span, None);
                        let span =
                        let opt_label = this.lower_label(*opt_label, e.id, expr_hir_id);