{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
                            let fn_ty = tcx.typeck(item_id.owner_id).expr_ty(expr);
                        hir::InlineAsmOperand::SymFn { expr } => {
                            visit_fn_use(tcx, fn_ty, false, *op_sp, &mut used_items);