bsp;toplevel_phrase&nbsp;=<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Ptop_def</span>&nbsp;<span class="keyword">of</span>&nbsp;<span class="constructor">Parsetree</span>.structure<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">Ptop_dir</span>&nbsp;<span class="keyword">of</span>&nbsp;string&nbsp;*&nbsp;<span class="constructor">Parsetree</span>.directive_argument<br>
&nbsp;&nbsp;<span class="keyword">and</span>&nbsp;directive_argument&nb