251     void *visit(boolean_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

   251     void *visit(boolean_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

   252 

   252 

   253     /* helper class for boolean_literal_c */

   253     /* helper class for boolean_literal_c */

   254     void *visit(boolean_true_c *symbol) {s4o.print("TRUE"); return NULL;}

   254     void *visit(boolean_true_c *symbol) {s4o.print("TRUE"); return NULL;}

   255     void *visit(boolean_false_c *symbol) {s4o.print("FALSE"); return NULL;}

   255     void *visit(boolean_false_c *symbol) {s4o.print("FALSE"); return NULL;}

   256 

   262 

   257     void *visit(neg_expression_c *symbol) {

   263     void *visit(neg_expression_c *symbol) {

   258       s4o.print("-");

   264       s4o.print("-");

   259       symbol->exp->accept(*this);

   265       symbol->exp->accept(*this);

   260       return NULL;

   266       return NULL;