From: seimarao@gmail.com   
      
   Hi,   
      
       Are there alternatives to syntax trees(i.e. the tree data structure)   
       when compiling via yacc or yacc like  tools ?   
      
   Sincerely,   
   Seima Rao.   
   [There's quadruples, doubly linked lists of data structures.  They   
   make it easier to rearrange code, but harder to do just about anything   
   else.  There's also DAGs, which are trees that can have shared subtrees,   
   useful when you're doing common subexpressions or tail merging. -John]   
      
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