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From: Richard Stallman <rms@gnu.org>
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Subject: Re: window-system and batch mode
Date: Wed, 31 Oct 2007 03:47:39 -0400
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-reply-to: <jwv640oxwrn.fsf-monnier+emacs@gnu.org> (message from Stefan
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Xref: news.gmane.org gmane.emacs.gnus.general:65501 gmane.emacs.devel:82194

    Yes, when I changed window-system to be terminal-local I had to decide
    what value to give to it for the initial "terminal" (which is basically
    just stdin/stdout rather than an X11 or tty connection).  I decided to
    use t (rather than nil which means "tty") to see what happens and
    hopefully catch some bugs.  And indeed it helped me get the
    "terminal-local window-system" patch working.

I am glad it helped catch some bugs, but the correct value for a stdin
is certainly nil.  stdin is not a window system.