Re: PATCH: ::= didn't respect parameter flags

[Mikael Magnusson <mikachu@xxxxxxxxx>]

On Wed, Jun 10, 2026 at 6:38 AM Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx> wrote:
>
> On Thu, Jun 4, 2026 at 12:16 AM Mikael Magnusson <mikachu@xxxxxxxxx> wrote:
> >
> > We agreed that at least the latter is definitely disagreeing with what you would
> > expect and the documentation.
>
> I meant to reply to this sooner.  Does this change in any way impact
> the 25 "Rules" in doc section 14.3.3?  Presently that doesn't mention
> assignment forms at all, but there are a number of explicit orderings
> of expansion flags with respect to each other and with respect to
> nested expansions, and I think it could be argued that
> ${(A)uniquearr::=$duplicates} contains a nested expansion.  Perhaps
> this at least needs clarification?

Hm, I did come up with a case that you might argue would affect where
the assignment forms should be inserted if they were,
% () { zsh -c $1; zsh-5.9-mika -c $1 } 'bar=lower; BAR=upper; typeset
-u foo=bar; echo $foo ${(P)${foo::=bar}}'
BAR upper
BAR lower
% () { zsh -c $1; zsh-5.9-mika -c $1 } 'bar=lower; BAR=upper; typeset
-u foo=bar; echo $foo ${(PU)${foo::=bar}}'
BAR UPPER
BAR LOWER

while all of these remain the same,
% () { zsh -c $1; zsh-5.9-mika -c $1 } 'bar=lower; BAR=upper; typeset
-u foo=bar; echo $foo ${(P)${(U)foo::=bar}}'
BAR upper
BAR upper
% () { zsh -c $1; zsh-5.9-mika -c $1 } 'bar=lower; BAR=upper; typeset
foo=bar; echo $foo ${(PU)${foo::=bar}}'
bar LOWER
bar LOWER
% () { zsh -c $1; zsh-5.9-mika -c $1 } 'bar=lower; BAR=upper; typeset
foo=bar; echo $foo ${(P)${(U)foo::=bar}}'
bar upper
bar upper
% () { zsh -c $1; zsh-5.9-mika -c $1 } 'bar=lower; BAR=upper; typeset
foo=bar; echo $foo ${(PU)${(U)foo::=bar}}'
bar UPPER
bar UPPER

So the difference is only that parameter flags take effect in the same
place as parameter expansion flags for assignment forms now, which is
what, as mentioned, the documentation for the assignment forms already
said it did.

None of these non-nested forms appear to change,
% () { zsh -c $1; zsh-5.9-mika -c $1 } 'bar=lower; BAR=upper; typeset
foo=bar; echo $foo ${(PU)foo::=bar}'
bar BAR
bar BAR
% () { zsh -c $1; zsh-5.9-mika -c $1 } 'bar=lower; BAR=upper; typeset
foo=bar; echo $foo ${(PU)foo}'
bar LOWER
bar LOWER
% () { zsh -c $1; zsh-5.9-mika -c $1 } 'bar=lower; BAR=upper; typeset
-u foo=bar; echo $foo ${(PU)foo::=bar}'
BAR BAR
BAR BAR
% () { zsh -c $1; zsh-5.9-mika -c $1 } 'bar=lower; BAR=upper; typeset
-u foo=bar; echo $foo ${(PU)foo}'
BAR LOWER
BAR LOWER

If you, or anyone, have a specific change to suggest to the list of
rules, that would be nice.

-- 
Mikael Magnusson