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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <140915091107.ZM3796@torch.brasslantern.com>
Date: Mon, 15 Sep 2014 09:11:07 -0700
In-reply-to: <20140914204239.GB4075@isis.sigpipe.cz>
Comments: In reply to Roman Neuhauser <neuhauser@sigpipe.cz>
 "(P:string:) glob qualifier-like effect for parameter expansion" (Sep 14,
 10:42pm)
References: <20140914204239.GB4075@isis.sigpipe.cz>
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To: zsh-users@zsh.org
Subject: Re: (P:string:) glob qualifier-like effect for parameter expansion
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On Sep 14, 10:42pm, Roman Neuhauser wrote:
}
}   set -A headers "${(@f):-"$(git show -s --format=$fmt $rev)"}"
} 
} and i'd like to add::
} 
}   mime-construct "${(@???)headers}" ...
} 
} to get::
} 
}   --header "From: ..." --header "Date: ..." --header "Subject: ..."

You can do this in zsh 5.0.6:

torch% x=(--header)  
torch% y=(From Date Subject)
torch% print -R ${x:^^y}
--header From --header Date --header Subject