]> I haven't seen this error before. Can someone provide an explanation? I've traced the problem down to a structural comparison (=) between two large data structures. I know functional comparisons are a no-no, but what is an "abstract value"? The problem occurred when I added big integers (Big_int.big_int) to the data structures under comparison. Suspecting big ints can't be structurally compared, I tried the following, but the compiler printed "false" as I would normally expect: let a = Big_int.zero_big_int = Big_int.unit_big_int in if a then print_string "true\n" else print_string "false\n"; Regards, Tom -- Tom Hawkins Launchbird Design Systems, Inc. 952-200-3790 http://www.launchbird.com/ ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners