From: Marc Lasson <titmarc@free.fr>
To: caml-list@inria.fr
Subject: Bug in ocamlc or in ocamlrun.
Date: Wed, 19 Apr 2006 01:16:27 +0200 [thread overview]
Message-ID: <4445734B.6030004@free.fr> (raw)
Hello,
When i compile the following program with ocamlc i get a segmentation fault.
Is it a bug in the ocaml system ? I did not succeed to isolate it.
----------------------
module LL (R : sig
type t
val add : t -> t -> t
end) =
struct
type t = R.t list
let add = List.map2 (R.add)
end
module rec M : sig
type t = P of int | L of LS.t
val add : t -> t -> t
val to_string : t -> string
end = struct
type param = ()
type t = P of int
| L of LS.t
let add a b = match a, b with
P a', P b' -> P (a'+b')
| L a', L b' -> L (LS.add a' b')
| _ -> failwith "incompatible"
let rec to_string = function
P i -> string_of_int i
| L l -> List.fold_left (fun r x -> r^" "^(to_string x)) "" l
end
and LS : sig type t = M.t list val add : t -> t -> t end = LL(M)
open M
let p = L [P 1; P 2]
let q = add p p
let () =
print_endline (to_string p);
print_endline (to_string q)
----------------------
If i replace the function LL.add by
let rec add a b = match a, b with
[], [] -> []
| x::a', y::b' -> (R.add x y)::(add a' b')
| _ -> failwith "add"
the segmentation fault magically disappear.
Hope that helps,
--
Marc Lasson.
next reply other threads:[~2006-04-18 22:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-18 23:16 Marc Lasson [this message]
2006-04-18 22:29 ` [Caml-list] " Jonathan Roewen
2006-04-19 8:45 ` Keiko Nakata
2006-04-19 19:38 ` Marc Lasson
2006-04-19 18:57 ` Remi Vanicat
2006-04-19 9:33 ` Sebastian Egner
2006-04-19 9:44 ` Jonathan Roewen
2006-04-19 10:55 ` Sebastian Egner
2006-04-19 20:24 ` Alain Frisch
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