From: anton@mips.complang.tuwien.ac.at   
      
   Gene  writes:   
   >Nonterminals that can never derive a terminal string are the   
   >problem.   
      
   Is it really?  Since they cannot derive a terminal, they have no   
   influence on the language described by the grammar.  They might just   
   as well not be there.  Are they really a problem (except for certain   
   implementation techniques)?   
      
   - anton   
   --   
   M. Anton Ertl   
   anton@mips.complang.tuwien.ac.at   
   http://www.complang.tuwien.ac.at/anton/   
      
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