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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Mon, 15 Jun 2015 20:24:31 -0700
In-Reply-To: <CAHYJk3QtwxXabmsuYz_D-EcWSkmhLn_XWkPUnhiOU7VDdZLTPg@mail.gmail.com>
Comments: In reply to Mikael Magnusson <mikachu@gmail.com>
        "Re: Read-only variables in emulation mode" (Jun 16,  2:10am)
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To: zsh workers <zsh-workers@zsh.org>
Subject: Re: Read-only variables in emulation mode
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On Jun 16,  2:10am, Mikael Magnusson wrote:
}
} % echo hi; _=foo; echo $_
} hi
} hi

That's actually a bug -- the assignment _=foo should erase $_ , I think.

} % for _ in a b c; do echo $_ hi; done
} hi
} hi hi
} hi hi
} 
} I'm not sure if this is better than printing a warning that $_ is
} readonly. :)

If you go back to the original message in the thread, the whole point
was to use $_ as a dummy variable that didn't need to be declared and
whose value was instantly discarded.  For that purpose, the warning is
extraneous.

Admittedly that's a pretty constrained use case.