protected void applyBadExp(ScopedName op, Object[] operands) {
   ExpressionPtr exp = new ExpressionPtr(op, operands);
   try {
     eb.apply(exp);
     assertTrue(false);
   } catch (ApologyException ae) {
     d.msg(Debug.COMPILE, EX_AP + ae.getMessage());
   }
 }
 protected ExpressionNode applyExp(ScopedName op, Object[] operands) {
   ExpressionPtr exp = new ExpressionPtr(op, operands);
   eb.apply(exp);
   return exp.get();
 }