 <a href="Arg.html#TYPEdoc">doc</a>) list -&gt; <a href="Arg.html#TYPEanon_fun">anon_fun</a> -&gt; <a href="Arg.html#TYPEusage_msg">usage_msg</a> -&gt; unit</code></pre><div class="info">
<code class="code"><span class="constructor">Arg</span>.parse speclist anon_fun usage_msg</code> parses the command line.
    <code class="code">speclist</code> is a list of triples <code class="code">(key, spec, doc)</code>.
    <code class="code">key</code> is the option keyword, it must start with a <code class="code"><