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feature wish #2688

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vicuna opened this issue Feb 22, 2001 · 2 comments
Closed

feature wish #2688

vicuna opened this issue Feb 22, 2001 · 2 comments
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feature-wish

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@vicuna
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vicuna commented Feb 22, 2001

Original bug ID: 290
Reporter: administrator
Status: closed
Resolution: fixed
Priority: normal
Severity: feature
Category: ~DO NOT USE (was: OCaml general)

Bug description

Full_Name: Francois Pottier
Version: 3.00
OS: Linux
Submission from: oto.inria.fr (192.93.2.2)

It would be nice if the `with' construct was given a more polymorphic
type in the following situation:

$ ocaml
Objective Caml version 3.00

type 'a t = { x : 'a };;

type 'a t = { x : 'a; }

let f r z = { r with x = z };;

val f : 'a t -> 'a -> 'a t =

Here, f could receive type 'a t -> 'b -> 'b t, because x is the only
field whose type depends on the parameter 'a.

This would allow `with' to behave exactly as if it were syntactic
sugar, which is not the case currently.
@vicuna
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vicuna commented Feb 23, 2001

Comment author: administrator

Full_Name: Francois Pottier
Version: 3.00

It would be nice if the `with' construct was given a more polymorphic
type in the following situation:

$ ocaml
Objective Caml version 3.00

type 'a t = { x : 'a };;

type 'a t = { x : 'a; }

let f r z = { r with x = z };;

val f : 'a t -> 'a -> 'a t =

Then you should be happy with 3.01:

    Objective Caml version 3.00+22 (2001-02-05)

type 'a t = { x : 'a };;

type 'a t = { x : 'a; }

let f r z = { r with x = z };;

val f : 'a -> 'b -> 'b t =

It's already been there for a few months.

 Jacques

@vicuna
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vicuna commented Mar 5, 2001

Comment author: administrator

Wish granted in 3.01

@vicuna vicuna closed this as completed Jun 29, 2001
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@vicuna