]> Brian Smith wrote: > In other words, how can I assert that (some_z : z :> x) and (some_z : > z :> y) will always be valid? Well, you can just encode the conversion in a function: let x_of_z (some_z : z):x = (some_z:z::>x) -- John Max Skaller, mailto:skaller@ozemail.com.au snail:10/1 Toxteth Rd, Glebe, NSW 2037, Australia. voice:61-2-9660-0850 ------------------- 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