Clean up handling of %destructor for the end token (token 0).

[bison.git] / src / reader.c

diff --git a/src/reader.c b/src/reader.c
index 800ecc227876b0b060551ca804c3152a67e13c55..928be1b85e89d1e5f4c6e16c77336a28bcc68293 100644 (file)
--- a/src/reader.c
+++ b/src/reader.c
@@ -488,7 +488,11 @@ packgram (void)
         rule.  Thus, the midrule actions have already been scanned in order to
         set `used' flags for this rule's rhs, so grammar_rule_check will work
         properly.  */
-      grammar_rule_check (p);
+      /* Don't check the generated rule 0.  It has no action, so some rhs
+        symbols may appear unused, but the parsing algorithm ensures that
+        %destructor's are invoked appropriately.  */
+      if (p != grammar)
+       grammar_rule_check (p);
 
       for (p = p->next; p && p->sym; p = p->next)
        {