   <br />}     <br />    <br /><span class="Modifier">private</span>&#160;<span class="Modifier">static</span> IEnumerable&lt;TSource&gt; WhereImpl&lt;TSource&gt;(     <br />&#160;&#160;&#160; <span class="Keyword">this</span> IEnumerable&lt;TSource&gt; source,     <br />&#160;&#160;&#160; Func&lt;TSource, <span class="ValueType">bool</span>&gt; predicate)     <br />{     <br />&#160;&#160;&#160; <span class="Statement">foreach</span> (TSource item <span class="Statement">in</span> source)     <br />&#160;&