;&gt;</span> <span>?&#8288;is_cpp_call_virtual:bool</span> <span>&#45;&gt;</span> <span>(<a href="../IR/Exp/index.html#type-t">IR.Exp.t</a> * <a href="../IR/Typ/index.html#type-typ">IR.Typ.typ</a>)</span> <span>&#45;&gt;</span> <a href="index.html#type-control">control</a> <span>&#45;&gt;</span> <a href="index.html#type-trans_result">trans_result</a></code></dt><dt class="spec value" id="val-undefined_expression"><a href="#val-undefined_expression" class="anchor"></a><code><span class="keyword">val</span> u