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<h5 class="subsubsection">2.7.14.1 Cat</h5>

<p>The list concatenation operation has this representation in virtual code. 
<a name="index-g_t_0040code_007bcat_007d-342"></a><a name="index-concatenation-343"></a>
     <dl>
<dt><em>T28</em><dd>[[<code>cat</code>]] = <code>((nil,nil),(nil,nil))</code>
</dl>

<p class="noindent">This function takes a pair of lists as an argument, an returns the list
obtained by appending the right one to the left. The semantics of
concatenation is what one would expect.

     <dl>
<dt><em>P35</em><dd>[[<code>cat</code>]] <code>(nil,</code><var>z</var><code>)</code> = <var>z</var>
<br><dt><em>P36</em><dd>[[<code>cat</code>]] <code>((</code><var>x</var><code>,</code><var>y</var><code>),</code><var>z</var><code>)</code> = <code>(</code><var>x</var><code>,</code>[[<code>cat</code>]] <code>(</code><var>y</var><code>,z))</code>
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