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echo-area-clear-hook definition?

From: Pavel Janík
Subject: echo-area-clear-hook definition?
Date: Sun, 28 Oct 2001 21:43:24 +0100
User-agent: Gnus/5.090004 (Oort Gnus v0.04) Emacs/21.1.50 (i386-suse-linux-gnu)


the variable echo-area-clear-hook is not defined as other Lisp variables in
keyboard.c (DEFVAR_LISP is #if 0'ed to provide doc-string, but the symbol
itself is not defined by DEFVAR_LISP):

#if 0
  DEFVAR_LISP ("echo-area-clear-hook", ...,
               doc: /* Normal hook run when clearing the echo area.  */);
  Qecho_area_clear_hook = intern ("echo-area-clear-hook");
  SET_SYMBOL_VALUE (Qecho_area_clear_hook, Qnil);

Can you please tell me what is the reason?
Pavel Janík

panic("Tell me what a watchpoint trap is, and I'll then
deal with such a beast...");
                  -- 2.2.16 arch/arch/sparc/kernel/traps.c

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