{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
        let args = GenericArgs::for_item(self.tcx, trait_def_id, |param, _| match param.kind {
        // Construct a trait-reference `self_ty : Trait<input_tys>`
            GenericParamDefKind::Lifetime | GenericParamDefKind::Const { .. } => {