Inheritance: Tools.SYMBOL
 public  ExpPair (Parser yyp, Exp  hd , ExpPair  tl ):base(((PCParser
)yyp)){ this . hd = hd ;
 this . tl = tl ;
}
 public  ExpFun (Parser yyp, ExpPair  val ):base(((PCParser
)yyp)){ this . val = val ;
}