{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
    let fn_abi = cx.fn_abi_of_instance(instance, ty::List::empty());
    let name = cx.mangled_name(instance);
    let (begin, end) = prefix_and_suffix(cx.tcx(), instance, &name, item_data, fn_abi);