pan class="string">"Weak.fill"</span></code>
   if <code class="code">ofs</code> and <code class="code">len</code> do not designate a valid subarray of <code class="code">a</code>.<br>
</div>

<pre><span id="VALblit"><span class="keyword">val</span> blit</span> : <code class="type">'a <a href="Weak.html#TYPEt">t</a> -&gt; int -&gt; 'a <a href="Weak.html#TYPEt">t</a> -&gt; int -&gt; int -&gt; unit</code></pre><div class="info ">
<code class="code"><span class="constructor">Weak</span>.blit ar1 off1 ar2 off2 