Extracts an AST from a Tree that contains an AST.</td></tr>
<tr><td valign="top"><a href="#tree_to_ast-2">tree_to_ast/2</a></td><td>
  Extracts an AST from a Tree that contains an AST, taking Node as the root node.</td></tr>
<tr><td valign="top"><a href="#value-1">value/1</a></td><td>
  Returns a "semantic" representation of the node, (which is used for
  comparing two nodes and decide if they can be mergerd).</td></tr>
</table>

<h2><a name="functions">Function Details</a></h2>

<h3 class="function"><a nam