ass="directive">import</span> <span class="type">haxe.macro.Expr</span>;</code></p><p class="availability">Available on all platforms</p><div class="doc"><p></p></div><div><a name="sub"></a><h3 style="line-height: 15px;"><p><code style="margin-left: -5px;"><span class="keyword">var</span> <a href="#sub"><span class="identifier">sub</span></a>:<a class="type" href="../../Null.html">Null</a>&lt;<a class="type" href="../../String.html">String</a>&gt;</code></p></h3><div class="doc" style="margin-bottom: 0px;ma