y.t</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span>(<span>string <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'a</span>)</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="type-var">'a</span> <span class="xref-unresolved">Core</span>.Command.Arg_type.t</span></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-arg_type"><a href="#val-arg_type" class="anchor"></a><code><span><span class="keyword">val</span> arg_