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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <170225154140.ZM19138@torch.brasslantern.com>
Date: Sat, 25 Feb 2017 15:41:40 -0800
In-Reply-To: <CA+rB6G+5s7QPuT-iRwZHOC3Mg7aSbk+4M7V6wgzTBGjTW_+4yw@mail.gmail.com>
Comments: In reply to Jim <linux.tech.guy@gmail.com>
        "Re: A bug or improperly formatted script" (Feb 25,  4:53pm)
References: <CA+rB6GJoCDbdEVYR-zYEh6P0Oau7VAxQeW6UcnksdeB3hvL=HQ@mail.gmail.com> 
	<170225141211.ZM20788@torch.brasslantern.com> 
	<CA+rB6G+5s7QPuT-iRwZHOC3Mg7aSbk+4M7V6wgzTBGjTW_+4yw@mail.gmail.com>
X-Mailer: OpenZMail Classic (0.9.2 24April2005)
To: linuxtechguy@gmail.com, zsh-users@zsh.org
Subject: Re: A bug or improperly formatted script
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On Feb 25,  4:53pm, Jim wrote:
}
} So in my original email the alternate example
} 
}  print $((${(z)${(fO)"$(dirs -v)"}[1][1]} + 1))
} 
} was this forcing it to an array or was it a fluke?

It was a fluke.  ${${$(print $'0\t~')[1]}[1]} == '0' whereas
${${$(print $'0\t~')[-1]}[1]} == '~' and $(( ~ + 1 )) == -2 (the
tilde being interpreted as bitwise negation).

Double-subscripting $var[1][1] yields the same byte whether $var is
a scalar or an array, whereas $var[-1][1] does not unless the scalar
is only a single character to begin with.

You'd never have seen -2 if $HOME were not the only entry in the
stack.  With $(dirs -lv) or with most other directories, the last char
of the directory name would have been intepreted as a variable name
and potentially produced even stranger results (though most like it
would be an unset variable and thus be treated as zero, hiding the
effect entirely).  A directory name ending in digits would have made
things even stranger.