Re: Incorrect(?) useless nonterminal

[Akim Demaille]

Le 6 nov. 07 à 17:02, Wilson Snyder a écrit :

> The only difference is line 893:
>
> sequenceExpr:   yFIRST_MATCH '(' ')'    { $<fl>$=$<fl>1; }
>
> versus the bad version:
>
> sequenceExpr:   yFIRST_MATCH '(' sequenceExpr ')'       { $<fl>$=$<fl>1; }
>
> While the rule is recursive, it doesn't seem significantly different  
> from
> other rules with parenthesis handling.

What differs is that you don't provide another rule to
anchor the recursion, so sequenceExpr is useless (it
does not produce any word).