From: Felipe Contreras <felipe.contreras@gmail.com>
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: More rabbit-holes with unset variables
Date: Fri, 27 Nov 2020 18:00:27 -0600 [thread overview]
Message-ID: <CAMP44s1Vb7BLHMaJTVwA=y1X3+UuocA3PGCuGVJRDMHAaG7zwg@mail.gmail.com> (raw)
In-Reply-To: <CAH+w=7ZxhRr1TYFe_SuKaT5TKsceh7RDTeQ-hfcZF08ctWeTvg@mail.gmail.com>
On Fri, Nov 27, 2020 at 4:39 PM Bart Schaefer <schaefer@brasslantern.com> wrote:
>
> On Fri, Nov 27, 2020 at 2:10 PM Felipe Contreras
> <felipe.contreras@gmail.com> wrote:
> >
> > So we can interpret what you said as 'so the only useful "declared but
> > not set" variable is a string' without losing any meaning.
>
> That's not correct, but again I was hoping it wasn't necessary to
> spell all this out.
>
> All of the following create parameters representing strings, none of
> which are useful unless they either have a default or the "preserve
> when not set" behavior applies:
These are not contradictory unless you commit the fallacy of the converse.
"All animals that bark are mammals" doesn't mean "all mammals bark".
Analogously:
"All unset variables that are useful are strings" doesn't mean "all
strings are unset variables that are useful".
To be pedantic: param_is_useful_unset(p) -> param_type_is_string(p).
Not the other way around.
This is a bit tautological, because if the variable is unset, it can't
be anything else but a string: param_is_unset(p) ->
param_type_is_string(p).
Cheers.
--
Felipe Contreras
next prev parent reply other threads:[~2020-11-28 0:00 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-25 7:02 Bart Schaefer
2020-11-25 13:19 ` Stephane Chazelas
2020-11-25 22:17 ` Felipe Contreras
2020-11-26 6:10 ` Stephane Chazelas
2020-11-26 7:20 ` Felipe Contreras
2020-11-26 11:21 ` Oliver Kiddle
2020-11-26 11:29 ` Roman Perepelitsa
2020-11-26 19:08 ` Felipe Contreras
2020-11-26 19:29 ` Felipe Contreras
2020-11-26 21:13 ` Bart Schaefer
2020-11-26 21:31 ` Felipe Contreras
2020-11-26 23:29 ` Bart Schaefer
2020-11-26 23:32 ` Bart Schaefer
2020-11-26 23:53 ` Felipe Contreras
2020-11-27 0:23 ` Bart Schaefer
2020-11-27 1:51 ` Felipe Contreras
2020-11-27 20:01 ` Bart Schaefer
2020-11-27 21:49 ` Felipe Contreras
2020-11-27 22:06 ` Bart Schaefer
2020-11-27 23:35 ` Felipe Contreras
2020-11-26 22:07 ` Bart Schaefer
2020-11-26 20:41 ` Bart Schaefer
2020-11-26 20:49 ` Stephane Chazelas
2020-11-26 21:20 ` Felipe Contreras
2020-11-26 22:41 ` Bart Schaefer
2020-11-26 23:45 ` Felipe Contreras
2020-11-27 0:09 ` Bart Schaefer
2020-11-27 0:30 ` Felipe Contreras
2020-11-27 0:51 ` Bart Schaefer
2020-11-27 1:30 ` Felipe Contreras
2020-11-27 20:54 ` Bart Schaefer
2020-11-27 22:10 ` Felipe Contreras
2020-11-27 22:39 ` Bart Schaefer
2020-11-28 0:00 ` Felipe Contreras [this message]
2020-11-28 0:04 ` Bart Schaefer
2020-11-28 10:52 ` Felipe Contreras
2020-11-28 0:36 ` The emulation rabbit-hole RE typeset/unset Bart Schaefer
2020-11-28 11:35 ` Felipe Contreras
2020-11-28 16:56 ` Bart Schaefer
2020-12-01 8:49 ` Felipe Contreras
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