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From: Felipe Contreras <felipe.contreras@gmail.com>
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Daniel Shahaf <d.s@daniel.shahaf.name>,
	Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Bug with unset variables
Date: Sat, 28 Nov 2020 06:05:12 -0600	[thread overview]
Message-ID: <CAMP44s16Gd_Qgs5bvYF3NgYrrdSkb5r3ZPJQ1aA1dvKv4xNpRA@mail.gmail.com> (raw)
In-Reply-To: <CAH+w=7awR=pODg+mcHKvssPyWPPhDeOb-TMG3B336bfeLOKf=w@mail.gmail.com>

On Fri, Nov 27, 2020 at 6:25 PM Bart Schaefer <schaefer@brasslantern.com> wrote:

> On Fri, Nov 27, 2020 at 3:38 PM Daniel Shahaf <d.s@daniel.shahaf.name> wrote:
> >
> > The best way to move forward would be to write a patch against the Test/
> > directory that specifies the proposed behaviour.  Use the "f" flag so
> > all newly-added tests will run, rather than just the first.
>
> There are existing tests that specifically check for the current
> behavior, so it's not as if this were simply overlooked.
>
> To write the proposed new test cases, we need to decide (this list may
> not be all-inclusive):

Yeah, I agree it's not as straightforward as it initially seemed.

I can write a test case for what I think should be the desired
behavior in the typical case: "typeset var" does *not* set var to an
empty string.

But that ignores most of the discussion that has already happened
here, and it seems in the Austin CSRG.

I bet it's possible to write the code that passes the above test-case,
but ten years from now--and if not, it will be twenty years from
now--somebody will try to add "local" to POSIX again, and zsh will
still be an inconsistent state.

Personally, I would rather attempt to do it right today, than add a
hack that sort of does what I initially wanted.

Maybe we are wasting time chasing multiple tails, but maybe we are
onto something.

Considering that POSIX hasn't managed to crack the problem after
essentially half a century, maybe a couple of mails in this mailing
list couldn't hurt.

When the solution requires creativity, you just can't know where it
could come from.

Cheers.

-- 
Felipe Contreras



  parent reply	other threads:[~2020-11-28 12:05 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-11 15:57 Felipe Contreras
2020-11-11 16:13 ` Roman Perepelitsa
2020-11-11 16:56   ` Felipe Contreras
2020-11-11 17:02     ` Roman Perepelitsa
2020-11-11 18:03       ` Felipe Contreras
2020-11-11 18:16         ` Roman Perepelitsa
2020-11-11 20:42           ` Felipe Contreras
2020-11-12  0:20             ` Mikael Magnusson
2020-11-12  1:10               ` Felipe Contreras
2020-11-12  8:45             ` Roman Perepelitsa
2020-11-12 10:47               ` Peter Stephenson
2020-11-12 18:48                 ` Bart Schaefer
2020-11-12 19:49                 ` Felipe Contreras
2020-11-12 18:46               ` Felipe Contreras
2020-11-12 19:10                 ` Roman Perepelitsa
2020-11-12 21:08                   ` Felipe Contreras
2020-11-13  8:51                     ` Roman Perepelitsa
2020-11-14  0:52                       ` Felipe Contreras
2020-11-14  5:41                         ` Roman Perepelitsa
2020-11-16 19:41                           ` Felipe Contreras
2020-11-16 20:22                             ` Roman Perepelitsa
2020-11-17 20:28                               ` Felipe Contreras
2020-11-18 22:45                                 ` Daniel Shahaf
2020-11-22  1:20                                   ` Felipe Contreras
2020-11-23  4:00                                     ` Daniel Shahaf
2020-11-23  6:18                                       ` Felipe Contreras
2020-11-19  2:59                                 ` Bart Schaefer
2020-11-22  1:50                                   ` Felipe Contreras
2020-11-17 20:54                             ` Bart Schaefer
2020-11-22  1:49                               ` Felipe Contreras
2020-11-23  6:48                                 ` Bart Schaefer
2020-11-23  7:26                                   ` Felipe Contreras
2020-11-23 20:26                                     ` Bart Schaefer
2020-11-23 23:39                                       ` Felipe Contreras
2020-11-24  0:52                                         ` Bart Schaefer
2020-11-25  8:46                                           ` Felipe Contreras
2020-11-27 15:44                                             ` Daniel Shahaf
2020-11-27 20:49                                               ` Felipe Contreras
2020-11-27 20:59                                                 ` Daniel Shahaf
2020-11-27 21:33                                                   ` Bart Schaefer
2020-11-27 23:37                                                     ` Daniel Shahaf
2020-11-27 23:45                                                       ` Bart Schaefer
2020-11-28  0:24                                                       ` Bart Schaefer
2020-11-28  7:32                                                         ` Bart Schaefer
2020-11-28 12:05                                                         ` Felipe Contreras [this message]
2020-11-12 19:26                 ` Bart Schaefer
2020-11-12 21:48                   ` Felipe Contreras
2020-11-13 22:17                     ` Bart Schaefer
2020-11-14  0:58                       ` Felipe Contreras
2020-11-11 18:36         ` Bart Schaefer
2020-11-11 21:08           ` Felipe Contreras
2020-11-11 17:02     ` Peter Stephenson
2020-11-11 18:05       ` Felipe Contreras

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