From: xcmhit@gmail.com   
      
   hi,   
   can somebody give me some comment on the following code in bison/byacc   
      
      
      
   pack_vector:   
      
      
         for (k = 0; ok && k < vector; k++)   
       if (pos[k] == j)   
         ok = false;   
      
   I believe I  understand the pack alg from Aho[1986] and flex. But I   
   don't understand  why it does not work if  base[i] == base[j] for some   
   i,j   
      
   (I confirmed it with bash-4.0/parse.y, it does not work if I comment   
   these lines)   
      
      
      
      
   Thanks!!   
      
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