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From: "Bart Schaefer" <schaefer@brasslantern.com>
Message-Id: <980610193012.ZM13897@candle.brasslantern.com>
Date: Wed, 10 Jun 1998 19:30:12 -0700
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Comments: In reply to Vincent Lefevre <Vincent.Lefevre@ens-lyon.fr>
        "Re: Empty array and parameter expansion" (Jun 10, 11:36pm)
References: <19980610152610.A29619@ens-lyon.fr> 
	<980610102651.ZM12101@candle.brasslantern.com> 
	<19980610233608.A9175@ens-lyon.fr>
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To: Vincent Lefevre <Vincent.Lefevre@ens-lyon.fr>
Subject: Re: Empty array and parameter expansion
Cc: zsh-users@math.gatech.edu
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On Jun 10, 11:36pm, Vincent Lefevre wrote:
> Subject: Re: Empty array and parameter expansion
> On Wed, Jun 10, 1998 at 10:26:51 -0700, Bart Schaefer wrote:
> > } % i=test
> > } % a=()
> > } % a=($a $i)
> > } % echo $a
> > } $i
> > 
> > I don't understand it either, as it doesn't happen to me.
> 
> After some tests... it happens only when RC_EXPAND_PARAM is set.
> But is it normal?

You want this patch, from zsh-workers article 3548 last November:

Index: subst.c
===================================================================
--- subst.c	1997/11/19 16:40:31	1.6
+++ subst.c	1997/11/19 16:44:41	1.7
@@ -1440,7 +1440,7 @@
 	    }
 	    if (plan9) {
 		uremnode(l, n);
-		return NULL;
+		return n;
 	    }
 	} else {
 	    x = aval[0];