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From: Richard Stallman <rms@gnu.org>
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Subject: Re: saved user abbrevs and system abbrevs
Date: Thu, 30 Nov 2006 14:48:54 -0500
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Xref: news.gmane.org gmane.emacs.devel:63161
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/63161>

    Does anyone see a better fix than changing each mode that defines
    abbrevs to use something like this:

    (defvar foo-abbrev-table nil)

    ;; Do not override any user abbrev for "foo".
    (unless (abbrev-expansion "foo" foo-abbrev-table)
      (define-abbrev foo-abbrev-table "foo" "foobar" nil 0 t))

Maybe we should change define-abbrev so that defining a system
abbrev does not override any user abbrev (unless you specify
"override") in some way.