* Lisp Changes in Emacs 22.1
** General Lisp changes:
+*** New syntax: \s now stands for the SPACE character.
+
+`?\s' is a new way to write the space character. You must make sure
+it is not followed by a dash, since `?\s-...' indicates the "super"
+modifier. However, it would be strange to write a character constant
+and a following symbol (beginning with `-') with no space between
+them.
+
+`\s' stands for space in strings, too, but it is not really meant for
+strings; it is easier and nicer just to write a space.
+
+*** New syntax: \uXXXX and \UXXXXXXXX specify Unicode code points in hex.
+
+For instance, you can use "\u0428" to specify a string consisting of
+CYRILLIC CAPITAL LETTER SHA, or `"U0001D6E2" to specify one consisting
+of MATHEMATICAL ITALIC CAPITAL ALPHA (the latter is greater than
+#xFFFF and thus needs the longer syntax).
+
+This syntax works for both character constants and strings.
*** The function `expt' handles negative exponents differently.
The value for `(expt A B)', if both A and B are integers and B is
** String changes:
-*** The escape sequence \s is now interpreted as a SPACE character.
-
-Exception: In a character constant, if it is followed by a `-' in a
-character constant (e.g. ?\s-A), it is still interpreted as the super
-modifier. In strings, \s is always interpreted as a space.
-
*** A hex escape in a string constant forces the string to be multibyte.
*** An octal escape in a string constant forces the string to be unibyte.
`assoc-ignore-representation', which are still available, but have
been declared obsolete.
-*** New syntax: \uXXXX and \UXXXXXXXX specify Unicode code points in hex.
-Use "\u0428" to specify a string consisting of CYRILLIC CAPITAL LETTER SHA,
-or "\U0001D6E2" to specify one consisting of MATHEMATICAL ITALIC CAPITAL
-ALPHA (the latter is greater than #xFFFF and thus needs the longer
-syntax). Also available for characters.
-
** Displaying warnings to the user.
See the functions `warn' and `display-warning', or the Lisp Manual.