e of type <a href="#type-transitive_callee"><code>transitive_callee</code></a>.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-string_of_transitive_callee"><a href="#val-string_of_transitive_callee" class="anchor"></a><code><span><span class="keyword">val</span> string_of_transitive_callee : <span><span class="optlabel">?len</span>:int <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-transitive_callee">transitive_callee</a> <span class="arrow">&#45;&gt;</span>