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).