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Date: Tue, 09 Feb 2016 16:19:04 +0000
From: Peter Stephenson <p.stephenson@samsung.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: unset "hash[key]" isn't matched with what "key" may be
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On Tue, 09 Feb 2016 07:50:50 -0800
Bart Schaefer <schaefer@brasslantern.com> wrote:
> So what magic makes this work for typeset?
> 
> torch% typeset -A foo
> torch% x='['
> torch% typeset "foo[$x]"     
> zsh: not an identifier: foo[[]
> torch% typeset 'foo[$x]'		<-- note here

getindex() does parse_subcript(); later getarg() looks for tokens and if
it finds any calls singsub().  "unset" doesn't have any of this
sophistication.

pws