span><span class="keyword">val</span> set_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="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p>In C string, set the index of the first null character, i.e., end of string, when called by <code>set