2</span> <span class="op">=</span> <span class="fu">as.deque</span><span class="op">(</span><span class="va">l</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">d</span> <span class="op">+</span> <span class="va">d2</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> |1, 2, s = "a", v = (1L 2L 3L), 0, 1|</span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</s