From: Mark H Weaver <mhw@netris.org>
To: John Cowan <cowan@ccil.org>
Cc: guile-user@gnu.org, Matt Wette <matt.wette@gmail.com>
Subject: Re: A value for "nothing"
Date: Tue, 28 Aug 2018 13:15:35 -0400 [thread overview]
Message-ID: <87pny2h0p4.fsf@netris.org> (raw)
In-Reply-To: <CAD2gp_S5HqBu_TZ4exS0xzrBUzAvEFgVwK7fbkcscNoQ_RruFA@mail.gmail.com> (John Cowan's message of "Tue, 28 Aug 2018 12:12:34 -0400")
John Cowan <cowan@ccil.org> writes:
> On Tue, Aug 28, 2018 at 11:40 AM Mark H Weaver <mhw@netris.org> wrote:
>
> That's the phrase used in R7RS-small, which fails to define it, as you
> noted, but that shortcoming is limited to R7RS.
>
> The relevant sentences in R5RS and R7RS are identical: " If <test>
> yields a false value and no <alternate> is specified, then the result
> of the expression is unspecified." Likewise, the paragraph from 1.3.2
> you quote below is identical in both standards. So either they both
> define it or they both don't.
>
> In R6RS, section 11.4.3 (Conditionals) provides this example:
>
> Unlike Wil Clinger, and apparently you, I don't believe that examples
> in specs are normative.
Alright, well, the formal denotational semantics makes it 100%
unambiguous, as I noted in my previous email.
Mark
next prev parent reply other threads:[~2018-08-28 17:15 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-26 10:13 A value for "nothing" HiPhish
2018-08-26 17:21 ` Thomas Morley
2018-08-26 17:27 ` Joshua Branson
2018-08-26 17:49 ` John Cowan
2018-08-27 4:52 ` Mark H Weaver
2018-08-27 13:00 ` John Cowan
2018-08-27 21:29 ` Mark H Weaver
2018-08-27 21:32 ` Mark H Weaver
2018-08-26 20:07 ` Mark H Weaver
2018-08-26 22:08 ` Matt Wette
2018-08-27 8:04 ` tomas
2018-08-27 20:12 ` Mark H Weaver
2018-08-27 20:46 ` Mark H Weaver
2018-08-28 0:50 ` Matt Wette
2018-08-28 6:58 ` Mark H Weaver
2018-08-28 15:19 ` John Cowan
2018-08-28 15:38 ` Mark H Weaver
2018-08-28 15:59 ` Mark H Weaver
2018-08-28 16:12 ` John Cowan
2018-08-28 17:15 ` Mark H Weaver [this message]
2018-08-28 19:07 ` Mark H Weaver
2018-08-27 20:54 ` Hans Åberg
2018-08-27 0:17 ` Panicz Maciej Godek
2018-08-27 8:02 ` tomas
2018-08-27 8:29 ` Panicz Maciej Godek
2018-08-27 8:29 ` HiPhish
[not found] ` <8840615.kRvQfVdCvZ@aleksandar-ixtreme-m5740>
[not found] ` <CAD2gp_QLqd=_RbF=HTEbCLp1onmUq-c74g0FXTvMgdz8JB4-8A@mail.gmail.com>
2018-08-27 8:24 ` HiPhish
[not found] ` <3467110.H24gZIzStD@aleksandar-ixtreme-m5740>
[not found] ` <87ftz0vidc.fsf@netris.org>
2018-08-27 8:40 ` HiPhish
2018-08-27 12:37 ` Ludovic Courtès
2018-08-27 19:49 ` Mark H Weaver
2018-08-28 7:52 ` Ludovic Courtès
-- strict thread matches above, loose matches on Subject: below --
2018-08-26 20:25 HiPhish
2018-09-13 21:49 HiPhish
[not found] ` <CAD2gp_Sg-aDXZKfOcL-i2py7ne4c0Cp+2HvKS4DYi1Antm_B1A@mail.gmail.com>
2018-09-14 22:45 ` HiPhish
2018-09-15 0:26 ` John Cowan
2018-09-15 14:50 ` HiPhish
2018-09-15 18:28 ` Keith Wright
2018-09-15 21:50 ` Edwin Watkeys
2018-09-15 22:16 ` HiPhish
2018-09-15 22:23 ` Edwin Watkeys
2018-09-15 22:13 ` HiPhish
2018-09-15 22:45 ` David Pirotte
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