ml">Let_syntax</a> : <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><div class="spec module" id="module-Or_unequal_lengths"><a href="#module-Or_unequal_lengths" class="anchor"></a><code><span class="keyword">module</span> <a href="Or_unequal_lengths/index.html">Or_unequal_lengths</a> : <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><dl><dt class="spec value" id="val-of_list"><a href="#val-of_list" class="anchor"></a><code><span class="key