s="anchor"></a><code><span class="keyword">val</span> min_elt_opt : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <span><a href="../Loc/index.html#type-t">Loc.t</a> option</span></code></dt><dt class="spec value" id="val-singleton"><a href="#val-singleton" class="anchor"></a><code><span class="keyword">val</span> singleton : <a href="../Loc/index.html#type-t">Loc.t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-fold"><a href="#val-fold" clas