">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/summarise.html" class="external-link">summarise</a></span><span class="op">(</span>val <span class="op">=</span> <span class="fu"><a href="../reference/sum_byname.html">sum_byname</a></span><span class="op">(</span><span class="va">val</span>, .summarise <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span><span class="op">)</span></span>
<span><span class="co"># res$val is a list column.</span></span>
<span