[Caml-list] Puzzled by Scanf.Scanning.in_channel

[Diego Olivier Fernandez Pons <dofp.ocaml@gmail.com>]

    Caml-List,

When I try to use Scanf.fscanf with an input channel created with
Scanf.Scanning.from_string the type checker complains

    let s = Scanf.Scanning.from_string "3" in Scanf.fscanf s "%i" (fun x -> x);;

    Characters 55-56:
    Error: This expression has type Scanf.Scanning.in_channel
       but an expression was expected of type in_channel

Which confuses me as from the manual I understood this should have worked.

    val from_string : string -> in_channel

    Scanning.from_string s returns a formatted input channel which
reads from the given string. Reading starts from the first character
in the string. The end-of-input condition is set when the end of the
string is reached.

Could anyone explain how is the proper way to generate a input channel
from a string ? Its for testing a program that will use stdin in
production.

        Diego Olivier