="spec value" id="val-sub"><a href="#val-sub" class="anchor"></a><code><span class="keyword">val</span> sub : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> int <span>&#45;&gt;</span> int <span>&#45;&gt;</span> <a href="index.html#type-t">t</a></code></dt><dd><p><code>sub bf i l</code> outputs the range <code>[i; i+l)</code> of bf. The bits above l of the result are zeroes.</p><p>See <a href="index.html#val-unsafe_sub"><code>unsafe_sub</code></a></p></dd></dl><dl><dt class="spec value" id="val-uns