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From: "Daniel Bünzli" <daniel.buenzli@erratique.ch>
To: Misha Aizatulin <avatar@hot.ee>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] typechecking
Date: Sat, 22 Mar 2014 21:40:15 +0100	[thread overview]
Message-ID: <2E564C20A45F40FFA6BDB6946F088F03@erratique.ch> (raw)
In-Reply-To: <532DEC4E.6040505@hot.ee>

Le samedi, 22 mars 2014 à 21:02, Misha Aizatulin a écrit :
> type t1 = T1
> type t2 = T2
>  
> let f T2 = ()
>  
> let input (c : in_channel) : t1 =
> let t = input_value c in
> f t;
> t

Unmarshaling is not type-safe, you always need to add a type annotation when you input_value. See the warning in the documentation here [1]. Your program should read:

type t1 = T1
type t2 = T2

let f T2 = ()

let input (c : in_channel) : t1 =
let t = (input_value c : t1) in
f t;
t



Which the compiler rejects.  

Best,

Daniel

[1] http://caml.inria.fr/pub/docs/manual-ocaml-4.01/libref/Marshal.html

  reply	other threads:[~2014-03-22 20:40 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-22 20:02 Misha Aizatulin
2014-03-22 20:40 ` Daniel Bünzli [this message]
2014-03-22 22:12   ` Yaron Minsky
2014-03-22 22:24     ` Jonathan Protzenko
2014-03-23  4:41 ` oleg
2014-03-23 12:59   ` Jacques Garrigue
2014-03-24  8:46     ` Alain Frisch

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