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Date: Wed, 23 Feb 2011 13:03:20 -0500 (EST)
From: "Benjamin R. Haskell" <zsh@benizi.com>
To: Zsh Users <zsh-users@zsh.org>
Subject: Function-scoped parameters?
Message-ID: <alpine.LNX.2.01.1102231257420.2792@hp>
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This doesn't work, probably unsurprisingly.  But is there a way to 
accomplish it?

function () {
     emulate -L zsh
     local x=asdf
     trap 'echo x is ${x:-unset}' EXIT
}

The use case is that I want to assign a local parameter 'temp' to 
be set to the name of a temporary file.  If anything goes wrong in the 
function, I'd like that temporary file to be removed, but I don't want 
'temp' to leak out of the function scope.

e.g.:
dosomething () {
     emulate -L zsh
     local temp=$(mktemp)
     setopt err_return
     trap '(( $+temp )) && rm $temp' EXIT
     # ...
}

-- 
Best,
Ben