(* Title: Pure/ML-Systems/install_pp_polyml-5.3.ML
Extra toplevel pretty-printing for Poly/ML 5.3.
*)
PolyML.addPrettyPrinter (fn depth => fn pretty => fn x =>
(case Future.peek x of
NONE => PolyML.PrettyString "<future>"
| SOME (Exn.Exn _) => PolyML.PrettyString "<failed>"
| SOME (Exn.Result y) => pretty (y, depth)));
PolyML.addPrettyPrinter (fn depth => fn pretty => fn x =>
(case Lazy.peek x of
NONE => PolyML.PrettyString "<lazy>"
| SOME (Exn.Exn _) => PolyML.PrettyString "<failed>"
| SOME (Exn.Result y) => pretty (y, depth)));