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MinimalConformance:Expressions:FLWOR:LetExpr:LetExprWithout:LetExpr010 tries to trigger an error by defining let $x:=(1,2,3), $y:=$x+1 return $x but an optimizing engine will discard the definition of $y as it is not used; a better query is let $x:=(1,2,3), $y:=$x+1 return $y
Fixed the test. Please verify the fix and CLOSE the bug.