emacs-28 22a832ad82: Mention the #f syntax from cl-prin1

[Lars Ingebrigtsen]

branch: emacs-28
commit 22a832ad82ed7d099e6ee3a947a5841d84e475c4
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Mention the #f syntax from cl-prin1
    
    * doc/lispref/objects.texi (Special Read Syntax): Mention #f,
    which is in cl-prin1 output (bug#55853).
---
 doc/lispref/objects.texi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/lispref/objects.texi b/doc/lispref/objects.texi
index b8e2dc5ab9..a715b45a6c 100644
--- a/doc/lispref/objects.texi
+++ b/doc/lispref/objects.texi
@@ -178,6 +178,12 @@ files.
 Skip the next @samp{N} characters (@pxref{Comments}).  This is used in
 byte-compiled files, and is not meant to be used in Emacs Lisp source
 files.
+
+@item #f
+Indicates that the following form isn't readable by the Emacs Lisp
+reader.  This is only in text for display purposes (when that would
+look prettier than alternative ways of indicating an unreadable form)
+and will never appear in any Lisp file.
 @end table