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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Mon, 31 Aug 2015 23:04:31 -0700
In-Reply-To: <20150830052603.GE18893@frozen.localdomain>
Comments: In reply to Timo Buhrmester <fstd.lkml@gmail.com>
        "Re: [patch] "which"-builtin writes diagnostics to stdout" (Aug 30,  7:26am)
References: <20150830030614.GB18893@frozen.localdomain> 
	<CAH+w=7aNzRtsJcvGcfyYFPAiRtNY69imSN+oGrF7K7unD5aNcA@mail.gmail.com> 
	<20150830052603.GE18893@frozen.localdomain>
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To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: [patch] "which"-builtin writes diagnostics to stdout
Cc: Timo Buhrmester <fstd.lkml@gmail.com>
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On Aug 30,  7:26am, Timo Buhrmester wrote:
} Subject: Re: [patch] "which"-builtin writes diagnostics to stdout
}
} > > | % which doesnotexist
} > > | doesnotexist not found
} > >
} > > the "doesnotexist not found" message goes to standard output,
} > > rather than standard error.
}
} Out of curiosity, what reason would zsh (being more bourne-ish than
} csh-ish, as far as I can tell) have to maintain this particular csh
} glitch rather than fixing it?

What makes you think it's a glitch?

I.e., "not found" here is not an error message!  It is the answer to the
question you asked, and you asked for the answer in csh format ("which"
is "whence -c").  If you don't want csh behavior, you should be using
"whence" directly so that you can omit the "-c" option.