_first_idx_of_null loc_to_string index_value mem</code>.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-unset_first_idx_of_null"><a href="#val-unset_first_idx_of_null" class="anchor"></a><code><span><span class="keyword">val</span> unset_first_idx_of_null : <span><a href="../../AbsLoc/Loc/index.html#type-t">AbsLoc.Loc.t</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="../Val/index.html#type-t">Val.t</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="