showtree
XTRACE(DBG_EVAL, ("evalstring: "), showtree(n));
VXTRACE(DBG_EVAL, (" "), showtree(n->nbinary.ch1));
VXTRACE(DBG_EVAL, ("evalloop do: "), showtree(n->nbinary.ch2));
VXTRACE(DBG_PARSE|DBG_EVAL|DBG_CMDS,("cmdloop: "),showtree(n));
void showtree(union node *);