Re: [Caml-list] strange behavior with record type definition

[Jon Harrop <jon@ffconsultancy.com>]

On Friday 11 November 2005 22:59, Florent wrote:
> Hi, I have defined two distinct record's types with a field's name in
> common. But when I try to define a function that uses the first of the
> types, the compiler gives me a type error.
> How can I use my first type in a function ??
>
> This is what I did:
>
> # type t0 = { i : int ; s : string };;
> type t0 = { i : int; s : string; }
> # type t1 = { i : int ; f : float };;
> type t1 = { i : int; f : float; }
> # let f (x:t0) = match x with {i= a; s= b} -> b;;
> Characters 28-40:
>   let f (x:t0) = match x with {i= a; s= b} -> b;;
>                               ^^^^^^^^^^^^
> The record field label s belongs to the type t0
> but is here mixed with labels of type t1

Either use different field names, e.g.:

  type t0 = { i0 : int ; s0 : string }
  type t1 = { i1 : int ; f1 : float }

or put them in separate modules.

-- 
Dr Jon D Harrop, Flying Frog Consultancy Ltd.
Objective CAML for Scientists
http://www.ffconsultancy.com/products/ocaml_for_scientists