; Update "Antinews" in ELisp manual

* doc/lispref/elisp.texi (Top):
* doc/lispref/anti.texi (Antinews): Update for Emacs 31.

doc/lispref/anti.texi

@@ -6,117 +6,133 @@
 @c This node must have no pointers.
 
 @node Antinews
-@appendix Emacs 29 Antinews
+@appendix Emacs 30 Antinews
 @c Update the elisp.texi Antinews menu entry with the above version number.
 
 For those users who live backwards in time, here is information about
-downgrading to Emacs version 29.4.  We hope you will enjoy the greater
+downgrading to Emacs version 30.2.  We hope you will enjoy the greater
 simplicity that results from the absence of many @w{Emacs
 @value{EMACSVER}} features.
 
 @itemize @bullet
 @item
-Mouse wheel events once again follow the platform and window-system
-conventions: sometimes they are @code{wheel-up/down} and sometimes
-@code{mouse-4/5/6/7}.  Lisp programs which use these should once again
-be aware of the conventions in effect and behave accordingly.
+Lisp strings are now mutable.  You can use @code{aset} on unibyte
+strings to replace single bytes by multibyte characters, and @code{aset}
+on multibyte strings can replace any character by any other character,
+regardless if they are ASCII or multibyte non-ASCII@.  We feel those
+restrictions are un-Emacsy and get in the way of doing all kinds of
+exciting things with strings.
 
 @item
-The command @code{describe-function} no longer distracts you by showing
-unnecessary details like the type of the function's object.  Emacs
-hackers always know whether a function is a primitive, a native-compiled
-Lisp function, or any other kind.  Stating the obvious simply wastes the
-precious screen estate; as you move into the past, and the typical
-dimensions of the screen become smaller, that waste is less and less
-justified.  So we made the waste smaller.
+Buffers that are current to a non-main thread cannot be killed by other
+threads.  We decided to get rid of the numerous complications which were
+needed to allow killing such buffers.  If your program needs to kill
+such buffers, you will need to use a disciplined approach of first
+making some other buffer current to the thread.
 
 @item
-The support for styled underline in face attribute was dropped.  The
-simple underline should be enough; anything else is just code bloat and
-creeping featurism.  Colorful underlines on TTY frames are no longer
-supported for the same reason.
+We removed the early detection of faces that inherit from themselves.
+As you move back in time, Emacs Lisp programmers become more and more
+proficient, so disallowing such tricks feels wrong.  Those who don't
+know well enough what they are doing will be amply punished by having
+their Lisp programs barf at display time or even wedge Emacs cold.
 
 @item
-IELM stopped recording its input history.  You will no longer be annoyed
-by inputs from your past sessions; each session starts with a clean
-slate.  What can be simpler and easier to remember?
+Calling @code{debug} in batch mode now kills Emacs.  We decided that
+there's no sense in continuing a batch session that entered the
+debugger: who and how will debug it, anyway?
+
+For the same reason, @kbd{C-c} in batch mode now always kills Emacs, it
+never quits.
 
 @item
-You can no longer disable JavaScript in xwidget Webkit sessions.  Since
-xwidgets are going away in one of the previous Emacs versions, we
-decided to make this one step in that direction and get rid of this
-complication.
+The functions that access and manipulate error descriptors were deleted.
+Functions like @code{error-type}, @code{error-slot-value} and others are
+useless bloat, since Lisp programs can simply access the data structure
+directly, as God intended!
 
 @item
-The @code{minibuffer-regexp-mode} was removed.  Regular expressions are
-just strings, so no fancy mode should be needed for editing them.
+We removed @code{frame-initial-p}, as its job can easily be done by
+testing several obscure variables and frame parameters.
 
 @item
-We removed the Compat package.  Forward compatibility for ELPA packages
-becomes less and less important as you move back through time, and soon
-enough ELPA will disappear entirely.  We decided it was prudent to start
-preparing for that now.
+We've added the @code{redisplay-dont-pause} variable, so we could allow
+interrupting a runaway redisplay cycle in one of the past versions of
+Emacs.
 
 @item
-We are back to interpreting @code{\x} without any following hex digits
-as character code zero (@acronym{NUL}), as it always was in Emacs.  The
-savings in typing due to this alone are enough to justify this
-simplification.
+There's no longer a guarantee that all the digit characters will have
+the @code{digit} (@code{?6}) category.  We feel that such silly
+consistency robs Lisp programmers of too much fun, whereby they should
+discover which digits have this category by trial-and-error.
+
+For the same reason, not all characters belonging to the @code{symbol}
+script will have the @code{symbol} (@code{?5}) category.
 
 @item
-To keep Emacs clean and elegant, we've removed the ability to show
-tooltips for fringe bitmaps.  What important information cam be shown on
-the fringes, and why would it require tooltips to explain its purpose?
-We decided it isn't justified to keep this in past versions of Emacs.
+Lisp programs can now easily delete that daemon frame by calling
+@code{delete-frame}, as with any other frame.  We decided there's no
+reason to make a special case for the daemon frames, especially as some
+past Emacs version will remove the daemon feature entirely.
 
 @item
-Fancy sorting-related facilities, like the @code{value<} function and
-keyword arguments for @code{sort}, were deleted as too complex.  The
-basic @code{sort} function should all that's needed in the years to go.
+Lisp files found on @code{load-path} are no longer cached.  We intend to
+make the @code{load-path} list shorter and shorter as we move to
+previous versions of Emacs, so caching files is an unnecessary
+complication and bloat of precious memory.
 
 @item
-Features related to the inheritance graph of major modes were deemed
-unnecessary and thus were dropped.  This includes
-@code{provided-mode-derived-p}, @code{derived-mode-add-parents}, and
-others.  We decided that untangling the mode inheritance relationships
-by hand facilitates more clear code and makes the intent evident.
+The annoying warning about the missing @code{lexical-binding} cookie
+when loading Lisp files was removed.  This is one more step towards
+eventual elimination of lexical binding from Emacs in one of the past
+versions.
+
+For the same reason, Lisp files loaded via the @option{-x} and
+@option{--script} command-line options no longer use lexical binding by
+default.
 
 @item
-We removed unnecessary functionality for handling touch screen events,
-as touch screens gradually disappear from view as you move back in time.
-There's no need to keep obsolete these new inventions in the past.
+To keep Emacs clean and elegant, we deleted the @code{setopt-local}
+macro.  This was one more useless bloat, since it is easy to do the same
+using @code{setq-local}, and avoids the annoying warnings about mismatch
+between the value and expected type defined by @code{defcustom}.
 
 @item
-Various new functions and variables for moving and transposing sexps and
-for moving by program statements were dropped as unnecessary.  The
-original commands that move by balanced expressions are more than
-enough.
+Pure storage is now part of Emacs, and is here to stay.  The function
+@code{purecopy} really copies its argument to pure storage.  This is a
+significant step towards making Emacs more memory-efficient on
+yesterday's computers, and more generally towards using @code{unexec} as
+the only way of dumping Emacs.
 
 @item
-We deleted some fancy @code{declare} forms for functions, such as
-@code{ftype}.  Emacs Lisp is not a string-typed language, which makes
-these declarations anathema.  The types @code{closure} and
-@code{interpreted-function} are gone for the same reason: no need to
-distinguish types of Lisp functions.
+The @code{cond*} macro was removed.  You can still use @code{pcase}
+instead, but better start using the venerable @code{cond} exclusively,
+as @code{pcase} and its ilk will disappear from Emacs in the near past.
+No one should need these fancy and hard-to-read constructs with their
+obscure semantics and myriads of backticks!  The original control-flow
+special forms of the pristine Emacs Lisp are more than enough.
 
 @item
-The byte compiler stopped issuing warnings about practices some purists
-consider questionable.  This includes warnings about missing
-@code{lexical-binding} cookies, empty bodies of special forms and
-macros, comparison with literals, @code{condition-case} without
-handlers, mutation of constants, and some others.  As time moves into
-the past, the typical Emacs hacker knows best what's correct code and
-what isn't, and thus these warnings become useless annoyances.  Good
-riddance!
+Xref commands automatically suggest visiting a tags table.  This is to
+enable symbol completion,and generally move towards removing all
+backends except the @code{etags} one in some past Emacs version.
 
 @item
-The @code{obarray} type is gone.  Obarrays are back to their original
-representation as vectors.  Each removed Lisp data type makes Emacs
-simpler and easier to use, so this is a welcome deletion.
+Support for SHA-3 message digests was removed from the function
+@code{secure-hash}.  We plan to continue removing algorithms from this
+function, so as to keep Emacs as lean as possible.  Eventually, just one
+kind of digest should be enough for everyone!
+
+@item
+We deleted unnecessary functions like @code{incf}, @code{decf},
+@code{plusp}, @code{minusp}, @code{oddp}, and @code{evenp}.  Use the
+corresponding functions from @file{cl-lib} or just write these trivial
+functions when you need them.  For the same reason, @code{all},
+@code{any}, @code{drop-while}, and @code{take-while} are also gone.
 
 @item
 As part of the ongoing quest for simplicity, many other functions and
 variables have been eliminated.  Other functions and variables, that
-were declared obsolete since Emacs 24, have been added back, in
-preparation for releasing Emacs 24 in some distant past.
+were declared obsolete since Emacs 25, have been added back, in
+preparation for releasing Emacs 25 in some distant past.
 @end itemize

doc/lispref/elisp.texi

@@ -237,7 +237,7 @@ To view this manual in other formats, click
 
 Appendices
 
-* Antinews::                Info for users downgrading to Emacs 29.
+* Antinews::                Info for users downgrading to Emacs 30.
 * GNU Free Documentation License:: The license for this documentation.
 * GPL::                     Conditions for copying and changing GNU Emacs.
 * Tips::                    Advice and coding conventions for Emacs Lisp.