Re: [Caml-list] printing an exception changes printed backtrace

[Ashish Agarwal <agarwal1975@gmail.com>]

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On Mon, Jan 17, 2011 at 10:37 AM, xclerc <xavier.clerc@inria.fr> wrote:


> The underlying problem is that "Printexc.print_backtrace" prints the
> backtrace
> for the last exception raised... which can be one raised by
> "Printf.eprintf" or
> "Printexc.to_string", but locally caught and not exposed to the outside
> world.
>

Okay, that makes sense.



> You will get different backtraces according to the value of
> "custom_printer".
>

I'm actually getting the same output (just "Not_found" printed). Tried
native and byte code, on two different systems.

Based on your explanation, I was expecting the following to give different
output if you change true to false. But actually nothing is printed out in
any case. So I'm really unclear now as to what print_backtrace does.

let f () =
  try raise Not_found
  with Not_found -> ()

let g () = raise (Failure "")

let () =
  try g()
  with e -> (
    if true then f() else ();
    Printexc.print_backtrace stderr
  )

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