From: Jean-vincent.Loddo@lipn.univ-paris13.fr
To: <caml-list@inria.fr>
Subject: [Caml-list] Lazyness and exceptions
Date: Thu, 22 Nov 2012 11:29:08 +0100 [thread overview]
Message-ID: <b3cd867690b0f42d9c5a3bb1b22f7b2d@lipn.univ-paris13.fr> (raw)
Hello,
I have observed a strange behaviour of lazy values when an exception is
raised. Here a minimal code that reproduces the behaviour:
# let action =
let thunk () =
Printf.printf "aaa\n";
failwith "bbb"
in
lazy (thunk ());;
val action : unit lazy_t = <lazy>
# Lazy.force action ;;
aaa
Exception: Failure "bbb".
# Lazy.force action ;;
Exception: Failure "bbb".
The lazy value seems to be (correctly) not re-evaluated but the
exception is (strangely) raised again. Why does this happen?
Jean-Vincent Loddo
next reply other threads:[~2012-11-22 10:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-22 10:29 Jean-vincent.Loddo [this message]
2012-11-22 10:33 ` Török Edwin
2012-11-22 10:37 ` David House
2012-11-22 10:57 ` Jean-vincent.Loddo
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