freehck@ws-kashin:~/prog/ocaml-error% cat catcher.ml
let raiser () =
  raise Not_found

let catcher () =
  try
    raiser ()
  with exn ->
    raise exn

let _ = catcher ()
freehck@ws-kashin:~/prog/ocaml-error% ocamlc -g catcher.ml -o catcher-ocamlc
freehck@ws-kashin:~/prog/ocaml-error% ocamlopt -g catcher.ml -o catcher-ocamlopt
freehck@ws-kashin:~/prog/ocaml-error% ./catcher-ocamlc
Fatal error: exception Not_found
Raised at file "catcher.ml", line 2, characters 8-17
Called from file "catcher.ml", line 6, characters 4-13
Re-raised at file "catcher.ml", line 8, characters 4-13
Called from file "catcher.ml", line 10, characters 8-18
freehck@ws-kashin:~/prog/ocaml-error% ./catcher-ocamlopt
Fatal error: exception Not_found
Raised by primitive operation at file "catcher.ml", line 6, characters 4-13
Re-raised at file "catcher.ml", line 8, characters 10-13
Called from file "catcher.ml", line 10, characters 8-18
freehck@ws-kashin:~/prog/ocaml-error%