ss="keyword">val</span> hash_fold_vertex : Ppx_hash_lib.Std.Hash.state <span>&#45;&gt;</span> <a href="index.html#type-vertex">vertex</a> <span>&#45;&gt;</span> Ppx_hash_lib.Std.Hash.state</code></dt><dt class="spec value" id="val-hash_vertex"><a href="#val-hash_vertex" class="anchor"></a><code><span class="keyword">val</span> hash_vertex : <a href="index.html#type-vertex">vertex</a> <span>&#45;&gt;</span> Ppx_hash_lib.Std.Hash.hash_value</code></dt><dt class="spec value" id="val-vertex_of_sexp"><a href="#v