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These four tests all use let $f := () return $f() The empty sequence cannot be invoked as a function, and thus should expect XPTY0004 which I doubt was the intent of the tests.
You are absolutely right. I copy and pasted this from other tests, the goal of which was to specifically test for a rejection of dynamic function call syntax. The tests were updated with let $f := function() { () } return $f() and the expected results were also fixed. Thanks for catching this.
Thanks. Confirmed fixed - although I had to fix a syntax error in the imported module.