n><a href="../Tree/index.html#type-re">Tree.re</a> <span class="arrow">&#45;&gt;</span></span> unit</span></code></div><div class="spec-doc"><p><code>print r</code> prints a string representation of <code>r</code></p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-export_graphviz"><a href="#val-export_graphviz" class="anchor"></a><code><span><span class="keyword">val</span> export_graphviz : <span><a href="../Tree/index.html#type-re">Tree.re</a> <span class="arrow">&#45;&gt;</spa