Re: <reductions>

[Akim Demaille]

> Can someone explain what was intended by the following code in  
> reduce.c?
>
>   static void
>   reduce_print (void)
>   {
>     if (yacc_flag && nuseless_productions)
>       fprintf (stderr, ngettext ("%d rule never reduced\n",
>                                  "%d rules never reduced\n",
>                                  nuseless_productions),
>                nuseless_productions);
>
> That is, why does -y cause Bison to report the count of grammatically
> useless rules as "rules never reduced"?  Later in this function, Bison
> reports the count again but as "useless rules".  Surely this is  
> wrong, but
> I'm not sure what was intended.

I might be wrong, but ISTR that that message
was forged by Paul to follow POSIX.  At that time
there was not such emphasis on the fact that there
were both grammar- and parser- useless rules.