ty">&nbsp;</div></li><li><dfn class="src"><a id="v:_params" class="def">_params</a> :: [<a href="Expr.html#t:Desc" title="Expr">Desc</a>]</dfn><div class="doc empty">&nbsp;</div></li><li><dfn class="src"><a id="v:_hasVar" class="def">_hasVar</a> :: <a href="../base-4.11.1.0/Data-Bool.html#t:Bool" title="Data.Bool">Bool</a></dfn><div class="doc empty">&nbsp;</div></li></ul></div></td></tr></table></div><div class="subs instances"><details id="i:Desc" open="open"><summary>Instances</summary><table><tr><td cla