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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <130310112656.ZM14395@torch.brasslantern.com>
Date: Sun, 10 Mar 2013 11:26:56 -0700
In-reply-to:
 <CAHYJk3QQTM9hUGiNonUhTEa=CrSutM+DErGXJO8VFobB7HV=_g@mail.gmail.com>
Comments: In reply to Mikael Magnusson <mikachu@gmail.com>
 "Re: Somewhat unexpected results of {myfd}>&1 when noclobber set" (Mar 10,
 1:11pm)
References:
 <CAHYJk3SexAxWnKHSBWCnvcAu7RjC_Go6Sd1Uwn-QujvpYzrnvw@mail.gmail.com>
	<130309071252.ZM19892@torch.brasslantern.com>
	<CAHYJk3QQTM9hUGiNonUhTEa=CrSutM+DErGXJO8VFobB7HV=_g@mail.gmail.com>
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To: zsh workers <zsh-workers@zsh.org>
Subject: Re: Somewhat unexpected results of {myfd}>&1 when noclobber set
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On Mar 10,  1:11pm, Mikael Magnusson wrote:
}
} On 9 March 2013 16:12, Bart Schaefer <schaefer@brasslantern.com> wrote:
} 
} >     integer bar=1+1
} >     print something >&$bar
} 
} Well, this 1+1 is evaluated when you assign to bar, not when you do >&$bar...
} (not ignoring the rest of the message, just replying to this part for now).
} 
} % foo=1+1
} % echo $foo
} 1+1
} % print something >&$foo
} 
} results in the file 1+1 being created with contents 'something'.

You missed the very important "integer" declaration.  If you change your
test to begin

% integer foo=1+1

you will get a very different result.  Because the variables created with
{foo}>& are implicitly given integer type, you have to try >&$foo with an
integer foo, not an ordinary scalar foo.