, <span class="type-var">'err</span>)</span> <a href="../index.html#module-IStd">IStdlib.IStd</a>.result</span>)</span></span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> list</span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> list</span> <span>&#45;&gt;</span> <span><span><span>(<span class="type-var">'acc</span>, <span class="type-var">'err</span>)</span> <a href="../index.html#module-IStd">IStdlib.IStd</a>.result</span> Base.List.Or_unequal_lengths.t</span></code></d