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From: Richard Stallman <rms@gnu.org>
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Subject: Re: [jidanni@deadspam.com: modeline doesn't divulge buffer will go
 bye bye]
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    >     Maybe we should do just that -- set the buffer-file-name to
    >     /nonexistingdrive/buffername,
    >
    > What is the point in that?  Why not just leave it nil?

    Start emacs -q, create new buffer using C-x b test RET.  Type
    something.  Quit using C-x C-c.  Emacs quits, your edit is lost.

Yes, I understand the goal.  But that is a user-level behavior
you want to change.  There are many ways to do it; making
buffer-file-name non-nil is not a good way.