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Generic interfaces Daphne Preston-Kendal (23 Jul 2021 11:34 UTC)
Re: Generic interfaces Lassi Kortela (23 Jul 2021 11:48 UTC)
Against hierarchy Lassi Kortela (23 Jul 2021 11:56 UTC)
Re: Against hierarchy Marc Nieper-Wißkirchen (23 Jul 2021 12:04 UTC)
Re: Against hierarchy Lassi Kortela (23 Jul 2021 12:08 UTC)
Re: Against hierarchy Marc Nieper-Wißkirchen (23 Jul 2021 12:26 UTC)
R6RS exception hierarchy Lassi Kortela (23 Jul 2021 12:39 UTC)
Re: R6RS exception hierarchy Marc Nieper-Wißkirchen (23 Jul 2021 13:09 UTC)
Re: R6RS exception hierarchy Lassi Kortela (23 Jul 2021 16:05 UTC)
Re: R6RS exception hierarchy Marc Nieper-Wißkirchen (23 Jul 2021 16:24 UTC)
Re: R6RS exception hierarchy Arthur A. Gleckler (23 Jul 2021 17:19 UTC)
Re: R6RS exception hierarchy Marc Nieper-Wißkirchen (23 Jul 2021 17:49 UTC)
Re: R6RS exception hierarchy Arthur A. Gleckler (23 Jul 2021 19:28 UTC)
Re: R6RS exception hierarchy John Cowan (26 Jul 2021 21:32 UTC)
Re: R6RS exception hierarchy Marc Nieper-Wißkirchen (27 Jul 2021 05:46 UTC)
Re: Generic interfaces Daphne Preston-Kendal (23 Jul 2021 17:47 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (23 Jul 2021 18:17 UTC)
Re: Generic interfaces Adam Nelson (23 Jul 2021 18:55 UTC)
Re: Generic interfaces Per Bothner (24 Jul 2021 19:31 UTC)
Re: Generic interfaces John Cowan (24 Jul 2021 04:27 UTC)
Re: Generic interfaces John Cowan (24 Jul 2021 04:26 UTC)
Re: Generic interfaces Daphne Preston-Kendal (25 Jul 2021 09:08 UTC)
Re: Generic interfaces Amirouche (25 Jul 2021 14:36 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (23 Jul 2021 12:18 UTC)
Re: Generic interfaces Daphne Preston-Kendal (23 Jul 2021 17:49 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (23 Jul 2021 17:51 UTC)
Re: Generic interfaces Daphne Preston-Kendal (23 Jul 2021 18:12 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (23 Jul 2021 18:39 UTC)
Re: Generic interfaces John Cowan (24 Jul 2021 03:56 UTC)
Re: Generic interfaces John Cowan (24 Jul 2021 02:22 UTC)
Re: Generic interfaces Jeremy Steward (24 Jul 2021 03:38 UTC)
Re: Generic interfaces Amirouche (25 Jul 2021 06:19 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (25 Jul 2021 08:39 UTC)
Re: Generic interfaces Daphne Preston-Kendal (25 Jul 2021 09:28 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (25 Jul 2021 10:04 UTC)
Re: Generic interfaces Daphne Preston-Kendal (25 Jul 2021 10:47 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (25 Jul 2021 12:16 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (29 Jul 2021 08:18 UTC)
Re: Generic interfaces John Cowan (26 Jul 2021 00:04 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (26 Jul 2021 06:25 UTC)
Re: Generic interfaces John Cowan (26 Jul 2021 12:26 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (26 Jul 2021 13:00 UTC)
Re: Generic interfaces Ray Dillinger (26 Jul 2021 19:28 UTC)
Re: Generic interfaces John Cowan (26 Jul 2021 19:53 UTC)
Re: Generic interfaces Arthur A. Gleckler (26 Jul 2021 22:15 UTC)
Re: Generic interfaces John Cowan (25 Jul 2021 23:37 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (26 Jul 2021 06:10 UTC)
Re: Generic interfaces John Cowan (26 Jul 2021 11:43 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (26 Jul 2021 12:09 UTC)
Re: Generic interfaces John Cowan (26 Jul 2021 13:14 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (26 Jul 2021 13:37 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (16 Nov 2021 18:52 UTC)
Re: Generic interfaces John Cowan (25 Jul 2021 23:00 UTC)
Re: Generic interfaces Marc Nieper-Wißkirchen (26 Jul 2021 05:44 UTC)

R6RS exception hierarchy Lassi Kortela 23 Jul 2021 12:39 UTC

> "Being of the exactly right exception type" is just another predicate. :)

Agreed - and should be.

> Anyway, it is part of the API of the standard R6RS library that
> inspection is possible with R6RS condition objects. Likewise, R7RS has
> some inspection, e.g. through `error-object-message'.

The problem is R6RS dictates that standard procedures raise particular
condition types which are defined as concrete types arranged in a
particular hierarchy of concrete types. Inspection can then be used to
check for those types and their parents, without using any predicates.

If we can relax the R6RS requirement that the conditions need to have
the given concrete types, and we only promise that the _predicates_ with
the standard names conform to the R6RS hierarchy, it's all good.

> I mean, every
> library (or system of libraries like R6RS) is free choose which kind of
> objects it uses to represent exception conditions and what predicates
> and accessors it exports. All that is important is that the RnRS do not
> dictate a particular type of object as an argument to `raise'.

Is it really the case that R6RS doesn't guarantee standard procedures to
raise conditions of given concrete types? I had the opposite impression.

If R6RS doesn't require the standard condition types to be inspectable,
that would work as well.