ode class="code"><span class="constructor">Arg</span>.<span class="constructor">Bad</span></code> is also raised by <code class="code"><span class="constructor">Arg</span>.parse_argv</code> in case of an error.<br>
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<pre><span id="VALusage"><span class="keyword">val</span> usage</span> : <code class="type">(<a href="Arg.html#TYPEkey">key</a> * <a href="Arg.html#TYPEspec">spec</a> * <a href="Arg.html#TYPEdoc">doc</a>) list -&gt; <a href="Arg.html#TYPEusage_msg">usage_msg</a> -&gt; unit</code></pre><div