clog << "derivative of " << e << " by " << x << " returned "
<< ed << " instead of " << d << endl;
clog << "returned:" << endl;
- ed.printtree(clog);
- clog << endl << "instead of" << endl;
- d.printtree(clog);
+ clog << tree << ed << "instead of\n" << d << dflt;
return 1;
}