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Re: [PATCH] Fix bang flag in ${(!)ref::=var} substitutions

X-seq: zsh-workers 54998
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: Philippe Altherr <philippe.altherr@xxxxxxxxx>
Cc: Zsh hackers list <zsh-workers@xxxxxxx>
Subject: Re: [PATCH] Fix bang flag in ${(!)ref::=var} substitutions
Date: Sun, 19 Jul 2026 14:06:46 -0700
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On Fri, Jul 10, 2026 at 5:06 AM Philippe Altherr
<philippe.altherr@xxxxxxxxx> wrote:
>
> The documentation states that with the substitution flag (!) the reference itself is examined, not its referent, but this fails in ${(!)ref::=var} substitutions:

I'm unsure what to do with this one.

Ksh doesn't have ${x::=y} so there's no direct comparison.

With "ref" undeclared or with `typeset -n ref` (placeholder),
${!ref:=var} ksh always returns "ref" and ignores the assignment.

So we're in a bit of uncharted territory here.  It's not clear that
::= should alter "ref".

Is this a precedence issue?  I.e., should ${(!)ref::=var} be
equivalent to ${(!)${ref::=var}} ?  (Which is the current behavior,
right?)

Follow-Ups:
- Re: [PATCH] Fix bang flag in ${(!)ref::=var} substitutions
  - From: Philippe Altherr

References:
- [PATCH] Fix bang flag in ${(!)ref::=var} substitutions
  - From: Philippe Altherr

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