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