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Patch from rms.

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Gerd Moellmann 1999-10-26 15:56:15 +00:00
parent 10a61062c4
commit 95ed62c7aa
1 changed files with 8 additions and 6 deletions
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14
lispref/variables.texi
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@ -98,14 +98,16 @@ x
@vindex nil
@vindex t
@kindex setting-constant
@cindex keyword symbol
In Emacs Lisp, certain symbols normally evaluate to themselves. These
include @code{nil} and @code{t}, as well as any symbol whose name starts
with @samp{:}. These symbols cannot be rebound, nor can their values be
changed. Any attempt to set or bind @code{nil} or @code{t} signals a
@code{setting-constant} error. The same is true for a symbol whose name
starts with @samp{:} (if it is interned in the standard obarray), except
that you are allowed to set such a symbol to itself.
with @samp{:} (these are called @dfn{keywords}). These symbols cannot
be rebound, nor can their values be changed. Any attempt to set or bind
@code{nil} or @code{t} signals a @code{setting-constant} error. The
same is true for a keyword (a symbol whose name starts with @samp{:}),
if it is interned in the standard obarray, except that setting such a
symbol to itself is not an error.
@example
@group
@ -121,7 +123,7 @@ nil @equiv{} 'nil
@defvar keyword-symbols-constant-flag
@tindex keyword-symbols-constant-flag
If this variable is @code{nil}, you are allowed to set and bind symbols
whose names start with @samp{:} as you wish. This is to make it
whose names start with @samp{:} however you wish. This is to make it
possible to run old Lisp programs which do that.
@end defvar