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Date: Wed, 15 May 2013 10:33:29 -0700
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Subject: Re: zsh built-in commands are removed when passing through a built-in
 command that spawns commands
From: Bart Schaefer <schaefer@brasslantern.com>
To: Antoine Pietri <antoine.pietri1@gmail.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
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On Wed, May 15, 2013 at 10:26 AM, Antoine Pietri
<antoine.pietri1@gmail.com> wrote:
>
> % time ( repeat 3; do; whence -a time; done )
> time
> /usr/bin/time

Well, that indicates that the builtin time is still there.  So
something else must be going on.

Have you tried looking at the oddball while loop with setopt xtrace ?