eyword">forall</span> f s a. (<a href="../base-4.13.0.0/Data-Functor.html#t:Functor" title="Data.Functor">Functor</a> f, HasField s &quot;extras&quot; a) =&gt; LensLike' f s a <a href="src/Proto.Tensorflow.Core.Util.TestLog_Fields.html#extras" class="link">Source</a> <a href="#v:extras" class="selflink">#</a></p></div><div class="top"><p class="src"><a id="v:hash" class="def">hash</a> :: <span class="keyword">forall</span> f s a. (<a href="../base-4.13.0.0/Data-Functor.html#t:Functor" title="Data.Functor">F