{"ast_node_type":"variable","tokens":[{"end":44,"kind":"keyword","start":0,"text":"let"}]}
        let def_ty = self.tcx.type_of(item);
    pub fn def_ty_with_args(&self, item: DefId, args_ref: GenericArgsRef<'tcx>) -> Ty<'tcx> {
        self.tcx.instantiate_and_normalize_erasing_regions(