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References: <CGME20171212135535epcas4p2456a2aed9c9be07c9d461acb602b71e9@epcas4p2.samsung.com>
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From: Bart Schaefer <schaefer@brasslantern.com>
Date: Sat, 13 Jan 2018 09:36:39 -0800
Message-ID: <CAH+w=7Y8PEArxyGjZbKxFQycHWz0_=oC-1Kvd6BrUR+XPyKARg@mail.gmail.com>
Subject: Re: Is outer quoting not needed (docs say "redundant")?
To: Sebastian Gniazdowski <psprint@zdharma.org>
Cc: Peter Stephenson <p.stephenson@samsung.com>, Zsh Users <zsh-users@zsh.org>
Content-Type: text/plain; charset="UTF-8"

On Sat, Jan 13, 2018 at 8:50 AM, Sebastian Gniazdowski
<psprint@zdharma.org> wrote:
>
> arr=( "${(@Q)${(z@):-"a b" c}}" )
>
> arr=( "${(@Q)${(z@):-a\\ b c}}" )

These are not the same.  Because of the way backslashes behave when
they follow the :- operator plus the effect of the (z) flag, the
latter is actually the same as

arr=( "${(@Q)${(z@):-"a\ b" c}}" )

You can see this if you examine the inner expansion in isolation:

% print -rl ${(z@):-"a b" c}
a
b
c
% print -rl ${(z@):-a\\ b c}
a\ b
c