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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <140727173904.ZM18201@torch.brasslantern.com>
Date: Sun, 27 Jul 2014 17:39:04 -0700
In-reply-to: <alpine.DEB.2.02.1407271325560.9969@MyComp.rgm-web.net>
Comments: In reply to Rory Mulvaney <rorymulv@gmail.com>
 "brace expansion in array subscript" (Jul 27,  2:57pm)
References: <alpine.DEB.2.02.1407271325560.9969@MyComp.rgm-web.net>
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To: Zsh Users <zsh-users@zsh.org>
Subject: Re: brace expansion in array subscript
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On Jul 27,  2:57pm, Rory Mulvaney wrote:
}
} echo ${arr[{2,5}]}
} 
} Why doesn't that get expanded into "echo ${arr[2]} ${arr[5]}"?

Array subscripts are already a comma-separated pair of arithmetic
expressions (or a quoted string value for associative arrays), and
curly braces already have their own special meaning in parameter
expansion expressions.  The syntax for brace expansion doesn't fit
well here.

} It seems there would be lots of convenient uses of this feature.

If you really need it, you can get it this way:

    echo ${(e):-\${arr[{2,5}]}}