Re: [eclipse-clp-users] Problem building tutorial/lp_cut_stock.ecl

Hi Josef,

Josef Chmel wrote:
> Hi,
> I can't build the file /tutorial/lp_cut_stock.ecl from the examples of
> the distribution.
> 
> I get the following message:
> 
> *** Warning: Singleton local variable Xj in do-loop (not used in loop
> body)
> illegal stream specification in get_stream_info(7, name, _117814)
> 

Thanks for reporting this. This is definitely a bug in ECLiPSe, and it 
seems to be happening when the system is trying to get the file name
(i.e. lp_cut_stock.ecl) as part of the warning message. This appears to 
be a bug that was introduced relatively recently (it is not in 6.0#103).
We will track down this bug and fix it.

> 
> As workaround it is possible to comment out line 59:
>                 % param(Xj)
> 
> and insert a dummy usage for loop variable J after line 41.
>                 foreach(J,VV),
>

The lp_cut_stock.ecl code looks incorrect. I am not familiar with the 
code, so I cannot tell what the original intention is, but when 
variables are passed into a do-loop body with a param, the variables
is intended to be used somewhere -- this is the reason for the warning. 
your workaround will only silence the warning, but almost certainly does
not fix the problem with the code.

Cheers,

Kish


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