type</span> zero_flag</span><span> = <span>bool option</span></span></code></div><div class="spec-doc"><p>The boolean is true when the pointer was dereferenced without testing for zero.</p></div></div><div class="odoc-spec"><div class="spec type" id="type-null_case_flag" class="anchored"><a href="#type-null_case_flag" class="anchor"></a><code><span><span class="keyword">type</span> null_case_flag</span><span> = bool</span></code></div><div class="spec-doc"><p>True when the value was obtained by doing case a