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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <110516142843.ZM27780@torch.brasslantern.com>
Date: Mon, 16 May 2011 14:28:43 -0700
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To: zsh-workers@zsh.org
Subject: XTRACE output -- I thought we'd fixed this?
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bash-3.2$ set -x
bash-3.2$ echo hello 2>/dev/null
+ echo hello
hello
bash-3.2$ 

torch% set -x
torch% echo hello 2>/dev/null
hello
torch% echo hello
+Src/zsh:3> echo hello
hello
torch% 

Stderr redirection isn't supposed to redirect the xtrace descriptor unless
you use a { ... } construct.  There's even this in exec.c:execcmd():

    /* Make a copy of stderr for xtrace output before redirecting */
    fflush(xtrerr);
    if (isset(XTRACE) && xtrerr == stderr &&
	(type < WC_SUBSH || type == WC_TIMED)) {
	if ((newxtrerr = fdopen(movefd(dup(fileno(stderr))), "w"))) {
	    xtrerr = newxtrerr;
	    fdtable[fileno(xtrerr)] = FDT_XTRACE;
	}
    }

Yet E02xtrace.ztst appears to expect this (wrong?) behavior, so I must be
mis-remembering something.