Fix xqlint warning

That doesn’t seem to be spec compliant.

On Aug 15, 2014, at 8:50 AM, William Candillon <notifications@github.com> wrote:

> In queries/modules/io/28/modules/xbrl/facts.jq:
> 
> > @@ -1085,10 +1085,9 @@ declare %private function facts:facts-for-rules(
> >        let $formula := $rule.Formula
> >        return 
> >          try {
> > -          (: avoid xqlint warnings :)
> > -          (($concepts, $hypercube, $aligned-filter,
> > -           $concept-maps, $rules, $cache, $options)[1] ! $$
> > -          ) ! reflection:eval($formula)
> > +          (# xqlint varrefs($concepts, $hypercube, $aligned-filter, $concept-maps, $rules, $cache, $options) #) {
> empty namespace
> 
> —
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