[basex-talk] function as default parameter

14 Feb 2026

      Good morning,

I came across some unexpected behaviour when using a function as a default functionparameter:

declare function local:test
( $exec as function(*)? := fn( $a, $b) { $a => trace("test1: ") }
)
{ $exec( "a", "b")
} ;
local:test(())

I would expect a trace- and a execution result, but I got nothing. Are my expectations wrong or could it be a bug?

PS code snipped added as test.xqm
PS The optimized query shows an empty value. 

mvgr.

Rob Stapper