t&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&nbsp;src:bytes&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;src_pos:int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;dst:bytes&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;dst_pos:int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;len:int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;blit_string&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&nbsp;src:string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;src_pos:int&