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(nil and t): Clarify.
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2006-05-01 Richard Stallman <rms@gnu.org>
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* intro.texi (nil and t): Clarify.
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* variables.texi (File Local Variables): Suggest using booleanp.
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2006-05-01 Juanma Barranquero <lekktu@gmail.com>
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* objects.texi (Type Predicates): Fix typos.
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@ -163,7 +163,7 @@ person reading this manual, are thought of as ``the programmer'' and are
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addressed as ``you''. ``The user'' is the person who uses Lisp
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programs, including those you write.
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@cindex fonts
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@cindex fonts in this manual
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Examples of Lisp code are formatted like this: @code{(list 1 2 3)}.
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Names that represent metasyntactic variables, or arguments to a function
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being described, are formatted like this: @var{first-number}.
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@ -187,14 +187,14 @@ readers. After the Lisp reader has read either @samp{()} or @samp{nil},
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there is no way to determine which representation was actually written
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by the programmer.
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In this manual, we use @code{()} when we wish to emphasize that it
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means the empty list, and we use @code{nil} when we wish to emphasize
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In this manual, we write @code{()} when we wish to emphasize that it
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means the empty list, and we write @code{nil} when we wish to emphasize
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that it means the truth value @var{false}. That is a good convention to use
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in Lisp programs also.
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@example
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(cons 'foo ()) ; @r{Emphasize the empty list}
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(not nil) ; @r{Emphasize the truth value @var{false}}
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(setq foo-flag nil) ; @r{Emphasize the truth value @var{false}}
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@end example
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@cindex @code{t}, uses of
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