e="Expr">AnyExpr</a> -&gt; <a href="../base-4.11.1.0/Data-Either.html#t:Either" title="Data.Either">Either</a> <a href="../base-4.11.1.0/Data-String.html#t:String" title="Data.String">String</a> (<a href="Expr.html#t:Expr" title="Expr">Expr</a> [<a href="../base-4.11.1.0/Data-Bool.html#t:Bool" title="Data.Bool">Bool</a>]) <a href="src/Expr.html#assertBools" class="link">Source</a> <a href="#v:assertBools" class="selflink">#</a></p><div class="doc"><p>assertBools asserts that any expression is actually a lis