On 21 Jan 2009, at 11:28, Alexander Sorockin wrote:
But what semantic value do you expect to be assigned for these $k
values?
According to the manual, "$n with n zero or negative is allowed for
reference to tokens and groupings on the stack before those that
match the current rule."
So then it is still permitted - but the answer by Akim shows some
problems: it is hard to tell exactly what is on the stack, as it is
dynamically allocated.
Hans
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