(Timers): Clarify about REPEAT when timer is delayed.

[gnu-emacs] / lispref / intro.texi

diff --git a/lispref/intro.texi b/lispref/intro.texi
index b2294be4c2dd5551f8ec022173423fe7e6b466ac..cd9b36ced85e84667c45b87419db081cf5f992d6 100644 (file)
--- a/lispref/intro.texi
+++ b/lispref/intro.texi
@@ -160,10 +160,10 @@ printer'' refer to those routines in Lisp that convert textual
 representations of Lisp objects into actual Lisp objects, and vice
 versa.  @xref{Printed Representation}, for more details.  You, the
 person reading this manual, are thought of as ``the programmer'' and are
-addressed as ``you''.  ``The user'' is the person who uses Lisp
+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}.
@@ -187,14 +187,14 @@ readers.  After the Lisp reader has read either @samp{()} or @samp{nil},
 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
@@ -212,6 +212,11 @@ to use them as constants in a program.  An attempt to change their
 values results in a @code{setting-constant} error.  @xref{Constant
 Variables}.
 
+@defun booleanp object
+Return non-nil iff @var{object} is one of the two canonical boolean
+values: @code{t} or @code{nil}.
+@end defun
+
 @node Evaluation Notation
 @subsection Evaluation Notation
 @cindex evaluation notation
@@ -228,7 +233,7 @@ the examples in this manual, this is indicated with @samp{@result{}}:
 @end example
 
 @noindent
-You can read this as ``@code{(car '(1 2))} evaluates to 1''.
+You can read this as ``@code{(car '(1 2))} evaluates to 1.''
 
   When a form is a macro call, it expands into a new form for Lisp to
 evaluate.  We show the result of the expansion with