div class="odoc-spec"><div class="spec value anchored" id="val-deref_str_nullable"><a href="#val-deref_str_nullable" class="anchor"></a><code><span><span class="keyword">val</span> deref_str_nullable : <span><span><a href="../../IR/Procname/index.html#type-t">IR.Procname.t</a> option</span> <span class="arrow">&#45;&gt;</span></span> <span>string <span class="arrow">&#45;&gt;</span></span> <a href="#type-deref_str">deref_str</a></span></code></div><div class="spec-doc"><p>dereference strings for null derefe