/dfn><div class="doc empty">&nbsp;</div></li><li><dfn class="src"><a id="v:eval" class="def">eval</a> :: <a href="Expr.html#t:Func" title="Expr">Func</a> a</dfn><div class="doc empty">&nbsp;</div></li></ul></div></td></tr></table></div><div class="subs instances"><details id="i:Expr" open="open"><summary>Instances</summary><table><tr><td class="src clearfix"><span class="inst-left"><span class="instance details-toggle-control details-toggle" data-details-id="i:id:Expr:Eq:1"></span> <a href="../base-4.11.1.0