keyword">val</span> update : <span><span class="type-var">'a</span> <a href="index.html#type-t">t</a></span> <span>&#45;&gt;</span> int <span>&#45;&gt;</span> <span>(<span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'a</span>)</span> <span>&#45;&gt;</span> unit</code></dt><dt class="spec value" id="val-unsafe_update"><a href="#val-unsafe_update" class="anchor"></a><code><span class="keyword">val</span> unsafe_update : <span><span class="type-var">'a</span> <a href="index.html#ty