Within my environment, I am experiencing some frustrating behavior of the Xquery Basex engine. I've done my best to single out the problem in the following XQUERY code :

The issues are :

1) executing this code yields an "Improper use? Potential bug?" exception (see details further on).

2) If I change the execution query to be

fn:count(local:dummy(function(){ () }, function() { (), ()} )()) ( I just copy and pasted the value of $insert into the fn:count(..) ) then the query is executed normally, returning "1".

3) If I change the function declaration local:wtf as follow 

declare  function local:wtf($x) {function() { $x}};  (I just removed "as item()"), then the query is executed normally, returning "1".

Can you reproduce it with another environment ?

Cheers,

Jean-Marc