{"ast_node_type":"function","tokens":[{"end":96,"kind":"keyword","start":0,"text":"fn"}]}
        fn new(tcx: TyCtxt<'tcx>, args: ty::GenericArgsRef<'tcx>) -> PredicatesCollector<'tcx> {
    impl<'tcx> PredicatesCollector<'tcx> {
            PredicatesCollector { tcx, preds: vec![], args }