anchor"></a><code><span class="keyword">val</span> explain_expr : <a href="../../IR/Tenv/index.html#type-t">IR.Tenv.t</a> <span>&#45;&gt;</span> <a href="../../IR/Procdesc/Node/index.html#type-t">IR.Procdesc.Node.t</a> <span>&#45;&gt;</span> <a href="../../IR/Exp/index.html#type-t">IR.Exp.t</a> <span>&#45;&gt;</span> <span>string option</span></code></dt><dt class="spec value" id="val-is_virtual"><a href="#val-is_virtual" class="anchor"></a><code><span class="keyword">val</span> is_virtual : <span><a href="