type-var">'a</span> <a href="index.html#type-t">t</a></span> <span>&#45;&gt;</span> <span>f:<span>(<span class="type-var">'a</span> <span>&#45;&gt;</span> bool)</span></span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> <a href="index.html#type-t">t</a></span> * <span><span class="type-var">'a</span> <a href="index.html#type-t">t</a></span></code></dt><dt class="spec value" id="val-drop_last"><a href="#val-drop_last" class="anchor"></a><code><span class="keyword">val</span> drop_last : <spa