Hi Buddy, 

that looks like a bug. 

Would you mind sharing your XQuery or a SSCE?
I think this is definitely something we might want to have a look at :-)

Best from Konstanz

Michael 

> Am 03.06.2019 um 13:12 schrieb Buddy Kresge <buddy.kre...@known2u.com>:
> 
> I am all of a sudden getting the below error (and things were working just 
> fine – weird).  Works fine in 9.1.2 but not in 9.2.X.  Any guidance would be 
> greatly appreciated.
>  
> Note:  I tried to send you an email with the full stack trace, but the 
> moderator rejected it because the email was too long.  I’ve cut down the 
> size, but you now no longer have the full stack trace.  If you need the full 
> stack trace, please let me know how you’d like that shared with you.
>  
> Thanks,
> Buddy
>  
> Error:
> Improper use? Potential bug? Your feedback is welcome:
> Contact: basex-talk@mailman.uni-konstanz.de 
> <mailto:basex-talk@mailman.uni-konstanz.de>
> Version: BaseX 9.2
> Java: AdoptOpenJdk, 1.8.0_202
> OS: Windows 10, amd64
> Stack Trace: 
> java.lang.ArrayIndexOutOfBoundsException: 1
>                at org.basex.query.expr.Preds.simplify(Preds.java:215)
>                at org.basex.query.expr.Filter.optimize(Filter.java:82)
>                at org.basex.query.expr.Filter.inline(Filter.java:260)
>                at org.basex.query.expr.gflwor.ForLet.inline(ForLet.java:66)
>                at org.basex.query.expr.gflwor.GFLWOR.inline(GFLWOR.java:804)
>                at 
> org.basex.query.expr.gflwor.GFLWOR.inlineLets(GFLWOR.java:339)
>                at org.basex.query.expr.gflwor.GFLWOR.optimize(GFLWOR.java:106)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:98)
>                at org.basex.query.expr.If.compile(If.java:63)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.expr.gflwor.ForLet.compile(ForLet.java:43)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:88)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncCall.compile(StaticFuncCall.java:64)
>                at org.basex.query.expr.gflwor.GFLWOR.compile(GFLWOR.java:94)
>                at org.basex.query.func.StaticFunc.comp(StaticFunc.java:69)
>                at 
> org.basex.query.func.StaticFuncs.compile(StaticFuncs.java:184)
>                at 
> org.basex.query.func.fn.FnFunctionLookup.opt(FnFunctionLookup.java:34)
>                at 
> org.basex.query.func.StandardFunc.optimize(StandardFunc.java:77)
>                at org.basex.query.expr.Arr.compile(Arr.java:43)

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