">&#45;&gt;</span></span>
  <span><span class="xref-unresolved">Stdlib</span>.Format.formatter <span class="arrow">&#45;&gt;</span></span>
  <span><span>(<span><span class="type-var">'b</span> list</span> * <span><span class="type-var">'a</span> list</span>)</span> <span class="arrow">&#45;&gt;</span></span>
  unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-pp_diff_of_string_list"><a href="#val-pp_diff_of_string_list" class="anchor"></a><code><span><span class="