s</p><p class="src"><a href="#v:fieldOf">fieldOf</a> :: <a href="../base-4.13.0.0/Data-Functor.html#t:Functor" title="Data.Functor">Functor</a> f =&gt; <a href="../base-4.13.0.0/GHC-Exts.html#t:Proxy-35-" title="GHC.Exts">Proxy#</a> &quot;maybe'clusterDef&quot; -&gt; (<a href="../base-4.13.0.0/Data-Maybe.html#t:Maybe" title="Data.Maybe">Maybe</a> <a href="Proto-Tensorflow-Core-Protobuf-Cluster.html#t:ClusterDef" title="Proto.Tensorflow.Core.Protobuf.Cluster">ClusterDef</a> -&gt; f (<a href="../base-4.13.0.0