A flag DEFS_CHAIN_HISTORY can be used to improve the error message
in case a cycle has been detected. If it is switched off and a cycle has been
detected, the user is notified that there is such a flag.
(* Title: Cube/ROOT.ML
ID: $Id$
Author: Tobias Nipkow
Copyright 1992 University of Cambridge
The Lambda-Cube a la Barendregt.
*)
val banner = "Barendregt's Lambda-Cube";
writeln banner;
print_depth 1;
use_thy "Cube";
print_depth 8;