2><div class="odoc-spec"><div class="spec value" id="val-lift_box" class="anchored"><a href="#val-lift_box" class="anchor"></a><code><span><span class="keyword">val</span> lift_box : <span><span><span><span class="type-var">'a</span> <a href="../index.html#type-box">box</a></span> <a href="argument-1-M/index.html#type-t">M.t</a></span> <span class="arrow">&#45;&gt;</span></span> <span><span><span class="type-var">'a</span> <a href="argument-1-M/index.html#type-t">M.t</a></span> <a href="../index.html#type-b