{"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
    let MonoItemPartitions { all_mono_items, codegen_units, .. } =
fn prepare_usage_sets<'tcx>(tcx: TyCtxt<'tcx>) -> UsageSets<'tcx> {
        tcx.collect_and_partition_mono_items(());