xception backtrace coming from <code class="code">work</code> or <code class="code">always</code>
    for easier debugging.</p>
</div>
</div>

<pre><span id="VALmap_end"><span class="keyword">val</span> map_end</span> : <code class="type">('a -&gt; 'b) -&gt; 'a list -&gt; 'b list -&gt; 'b list</code></pre>
<pre><span id="VALmap_left_right"><span class="keyword">val</span> map_left_right</span> : <code class="type">('a -&gt; 'b) -&gt; 'a list -&gt; 'b list</code></pre>
<pre><span id="VALfor_all2"><span class