(output): Do not output "#include <stdio.h>"; that is bison.simple's

[bison.git] / src / nullable.c

diff --git a/src/nullable.c b/src/nullable.c
index 2797180c4496e51341627394bbb84bb352c36831..8e8809e20b993f6f865aade2202fefe4f5c5e6bf 100644 (file)
--- a/src/nullable.c
+++ b/src/nullable.c
@@ -107,23 +107,16 @@ set_nullable (void)
     }
 
   while (s1 < s2)
-    {
-      p = rsets[*s1++];
-      while (p)
-       {
-         int ruleno = p->value;
-         p = p->next;
-         if (--rcount[ruleno] == 0)
+    for (p = rsets[*s1++]; p; p = p->next)
+      {
+       int ruleno = p->value;
+       if (--rcount[ruleno] == 0)
+         if (rule_table[ruleno].useful && !nullable[rule_table[ruleno].lhs])
            {
-             int symbol = rule_table[ruleno].lhs;
-             if (symbol >= 0 && !nullable[symbol])
-               {
-                 nullable[symbol] = 1;
-                 *s2++ = symbol;
-               }
+             nullable[rule_table[ruleno].lhs] = 1;
+             *s2++ = rule_table[ruleno].lhs;
            }
-       }
-    }
+      }
 
   XFREE (squeue);
   XFREE (rcount);