(* TEST
   flags = "-g"
   ocamlrunparam += ",b=1"
   * bytecode
     reference = "${test_source_directory}/backtrace.byte.reference"
   * native
     reference = "${test_source_directory}/backtrace.opt.reference"
     compare_programs = "false"
*)

(* A test for stack backtraces *)

exception Error of string

let rec f msg n =
  if n = 0 then raise(Error msg) else 1 + f msg (n-1)

let g msg =
  try
    f msg 5
  with Error "a" -> print_string "a"; print_newline(); 0
     | Error "b" as exn -> print_string "b"; print_newline(); raise exn
     | Error "c" -> raise (Error "c")

let _ =
  Printexc.record_backtrace true;
  ignore (g Sys.argv.(1))
