numeric value</span></span></span>
<span class="r-in"><span><span class="st">   #' </span></span></span>
<span class="r-in"><span><span class="st">   #' @return x + a</span></span></span>
<span class="r-in"><span><span class="st">   #' </span></span></span>
<span class="r-in"><span><span class="st">   #' @export</span></span></span>
<span class="r-in"><span><span class="st">   add_a &lt;- function(x) x + a</span></span></span>
<span class="r-in"><span><span class="st">   </span></span></span>
<span class="r