n>)</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="label">finish</span>:<span>(<span><span class="type-var">'accum</span> <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'final</span>)</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="type-var">'t</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span>(<span class="type-var">'final</span>, <span class="type-var">'err</span>)</span> <span class="xref-unresolved">IStdlib</span>.IStd.R