><span class="lineno">  160</span>&#160;    <span class="keywordflow">if</span> (IsBetaZero &amp;&amp; output_op.is_source_needed())</div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;      assert(0);</div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;</div><div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;    <span class="keyword">typename</span> OutputTileIterator::Fragment source_fragment;</div><div class="line"><