.Maybe">Maybe</a> a <a href="src/Expr.html#evalConst" class="link">Source</a> <a href="#v:evalConst" class="selflink">#</a></p><div class="doc"><p>evalConst tries to evaluate a constant expression and 
 either returns the resulting constant value or nothing.</p></div></div><div class="top"><p class="src"><a id="v:isConst" class="def">isConst</a> :: <a href="Expr.html#t:Desc" title="Expr">Desc</a> -&gt; <a href="../base-4.11.1.0/Data-Bool.html#t:Bool" title="Data.Bool">Bool</a> <a href="src/Expr.html#isConst