re class="programlisting"><span class="keyword">auto</span> <span class="identifier">pos</span> <span class="special">=</span> <span class="identifier">positions</span><span class="special">.</span><span class="identifier">position_of</span><span class="special">(</span><span class="identifier">my_ast</span><span class="special">);</span>
</pre>
<p>
        Where <code class="computeroutput"><span class="identifier">my_ast</span></code> is the AST,
        <code class="computeroutput"><span class="identifie