span></code></td></tr></table></dt></dl><dl><dt class="spec value" id="val-length"><a href="#val-length" class="anchor"></a><code><span class="keyword">val</span> length : <span><span class="type-var">'a</span> list</span> <span>&#45;&gt;</span> int</code></dt><dt class="spec value" id="val-compare_lengths"><a href="#val-compare_lengths" class="anchor"></a><code><span class="keyword">val</span> compare_lengths : <span><span class="type-var">'a</span> list</span> <span>&#45;&gt;</span> <span><span class="typ