{"ast_node_type":"variable","tokens":[{"end":95,"kind":"keyword","start":0,"text":"let"}]}
        let (args, _) = self.lower_generic_args_of_path(span, def_id, &[], item_segment, None);
    ) -> GenericArgsRef<'tcx> {
        if let Some(c) = item_segment.args().constraints.first() {