>  128</span>&#160;           upper(idx + 1) = low</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;           lower(idx + 1) = lower(idx)</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;           <span class="comment">!upper(idx) is unchanged</span></div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;           lower(idx) = high</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</spa