{"ast_node_type":"variable","tokens":[{"end":22,"kind":"keyword","start":0,"text":"let"}]}
    let fresh_adt_ty =
    let fresh_impl_args = infcx.fresh_args_for_item(impl_span, impl_def_id.to_def_id());
        tcx.impl_trait_ref(impl_def_id).unwrap().instantiate(tcx, fresh_impl_args).self_ty();