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Date: Sat, 22 Mar 2014 21:40:15 +0100
From: =?utf-8?Q?Daniel_B=C3=BCnzli?= <daniel.buenzli@erratique.ch>
To: Misha Aizatulin <avatar@hot.ee>
Cc: caml-list@inria.fr
Message-ID: <2E564C20A45F40FFA6BDB6946F088F03@erratique.ch>
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Subject: Re: [Caml-list] typechecking

Le samedi, 22 mars 2014 =C3=A0 21:02, Misha Aizatulin a =C3=A9crit :
> type t1 =3D T1
> type t2 =3D T2
>=20=20
> let f T2 =3D ()
>=20=20
> let input (c : in_channel) : t1 =3D
> let t =3D input_value c in
> f t;
> t

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

type t1 =3D T1
type t2 =3D T2

let f T2 =3D ()

let input (c : in_channel) : t1 =3D
let t =3D (input_value c : t1) in
f t;
t



Which the compiler rejects.=20=20

Best,

Daniel

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