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boundary="------------JfVKqMKliTFLSNdIEmlNuMin"; protected-headers="v1" From: Maxime Devos To: bokr@bokr.com, Maxim Cournoyer Cc: 56799@debbugs.gnu.org, attila@lendvai.name, Tobias Geerinckx-Rice Message-ID: Subject: Re: bug#56799: (gnu services configuration) usage of *unspecified* is problematic References: <87o7xa8qxt.fsf@gmail.com> <87a68uqz9r@nckx> <87fsim8l17.fsf@gmail.com> <20220728045506.GA9725@LionPure> In-Reply-To: <20220728045506.GA9725@LionPure> --------------JfVKqMKliTFLSNdIEmlNuMin Content-Type: multipart/mixed; boundary="------------785fQ0i13ZkShp6EYKUjt5xB" --------------785fQ0i13ZkShp6EYKUjt5xB Content-Type: multipart/alternative; boundary="------------ZFCmXJGQGFal1bgURxnYJqIA" --------------ZFCmXJGQGFal1bgURxnYJqIA Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 DQpPbiAyOC0wNy0yMDIyIDA2OjU1LCBib2tyQGJva3IuY29tIHdyb3RlOg0KPiBMb3RzIG9m IHN5c3RlbXMgYXJlIGRlYWxpbmcgd2l0aCB0aGlzIGlzc3VlLCBpdCBzZWVtcywganVkZ2lu ZyBmcm9tDQo+IFsxXWh0dHBzOi8vZW4ud2lraXBlZGlhLm9yZy93aWtpL0JvdHRvbV90eXBl DQoNCkkgZG9uJ3QgdGhpbmsgaXQncyBhIGJvdHRvbSB0eXBlIC0tICp1bnNwZWNpZmllZCog X2lzXyBhIHZhbHVlLCBzbyBpZiB3ZSANCmFzc2lnbiBhIHR5cGUgdG8gaXQsIGl0IGlzIGlu aGFiaXRlZCwgYW5kIGhlbmNlIG5vdCBhIGJvdHRvbSB0eXBlLiBJDQoNCj4gV2hhdCBhYm91 dCB1c2luZyBjaGFyYWN0ZXJzIGZyb20gc29tZSBwcml2YXRlIHVwcGVyIHVuaWNvZGUgc2Vj dGlvbg0KPiB0byByZXByZXNlbnQgdmFyaW91cyBraW5kcyBvZiB1bnNwZWNpZmllZCB0aGlu Z3M/IEUuZy4sDQo+IGFzIGd1aWxlIG5hbWVkIGNoYXJzLA0KPg0KPiAjXHVuc3BlY2lmaWVk X2Z1bmN0aW9uX3JldHZhbA0KPiAjXHVuc3BlY2lmaWVkX2Z1bmN0aW9uX2Vycm9yDQo+ICNc dW5zcGVjaWZpZWRfbWFjcm9fZXJyDQo+ICNcdW5zcGVjaWZpZWRfZXhjZXB0aW9uDQogwqBz dXBwb3NlIHlvdSBjb3VsZCBzdWJkaXZpZGUgdGhlICp1bnNwZWNpZmllZCogdmFsdWUsIGJ1 dCB3aHkgY2hhcmFjdGVycz8NCg0KSSB0aGluayBpdCB3b3VsZCBiZSBiZXR0ZXIgdG86DQoN CiAgKiBncmFkdWFsbHkgbW92ZSBhd2F5IGZyb20gKnVuc3BlY2lmaWVkKiB0byAodmFsdWVz KQ0KICAqIGFuZCB0aGlzIHdheSwgZ3JhZHVhbGx5IGNoYW5nZSB0aGUgbWVhbmluZyBvZiAq dW5zcGVjaWZpZWQqIGZyb20gImFuDQogICAgdW5zcGVjaWZpZWQgdmFsdWUiIHRvICdhbiBh dG9tIHlvdSBjYW4gZG8gd2l0aCBhcyB5b3Ugd2FudCINCiAgKiBhZnRlciB0aGlzLCB1bnNw ZWNpZmllZD8gYW5kIG1ha2luZyAjPHVuc3BlY2lmaWVkPiByZWFkYWJsZSBieSB0aGUNCiAg ICByZWFkZXIgYXJlbid0IHdlaXJkIGFueW1vcmUNCg0KdGhvdWdoIG1vcmUgc29tZXRoaW5n IGZvciBndWlsZS1kZXZlbEAgSSBzdXBwb3NlLg0KDQpHcmVldGluZ3MsDQpNYXhpbWUNCg0K --------------ZFCmXJGQGFal1bgURxnYJqIA Content-Type: text/html; 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On 28-07-2022 06:55, bokr@bokr.com wrote:
Lots of systems are dealing =
with this issue, it seems, judging from
[1] https://en.wikipedia.org/wiki/B=
ottom_type

I don't think it's a bottom type -- *unspecified* _is_ a value, so if we assign a type to it, it is inhabited, and hence not a bottom type. I 

What about using character=
s from some private upper unicode section
to represent various kinds of unspecified things? E.g.,
as guile named chars,

#\unspecified_function_retval
#\unspecified_function_error
#\unspecified_macro_err
#\unspecified_exception
=C2=A0suppose you could subdivide the *unspecified* value, but why characters?

I think it would be better to:

  • gradually move away from *unspecified* to (values)
  • and this way, gradually change the meaning of *unspecified* from "an unspecified value" to 'an atom you can do with as you want"
  • after this, unspecified? and making #<unspecified> readable by the reader aren't weird anymore

though more something for guile-devel@ I suppose.

Greetings,
Maxime

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