by-ivar">@func</span> <span class="ruby-operator">==</span> <span class="ruby-value str">'_add'</span>
      <span class="ruby-identifier">src</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-value str">&quot;(let ((_buf '())) &quot;</span> <span class="ruby-operator">+</span> \
               <span class="ruby-value str">&quot;(define (_add x) (set! _buf (cons x _buf))) &quot;</span>
      <span class="ruby-comment cmt">#src &lt;&lt; &quot;(let* ((_buf '())&quot; +        #             