Brian,
Thank you very much.  You are absolutely correct about the problem and
premature diagnosis.
Michael
Brian Candler wrote:
> 
> Notice that the problem you have come across has nothing to with "if"
> statements, nor with them being embedded in the "upto" construct. The 
> moral:
> try to avoid premature diagnosis :-)
> 
> Regards,
> 
> Brian.

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