Associating an empty replacement value for "\cr"

[fatiparty--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

> fatiparty--- via Users list for the GNU Emacs text editor
> <help-gnu-emacs@gnu.org> writes:
> 
> > Is this the way to associate an empty replacement value for "\cr". 
> > When I do not place a space after
> > ? I get an error.
> >
> > (defvar texsym-cluster
> >  ("\\alpha" . ?α)  ("\\cr" . ? ))
> 
> How is that var used?
> 
> ?c is the read syntax for a character.  There is no "empty" character of
> course.  Can you use strings instead as replacements?
> 
> Michael.

I have a  keybinding sequence "H-s" that would remove "\cr" text from view 

I am using texsym-cluster in this way

(defun texsym-predicate (start end _match)
  "Prettify mathematical expressions defined by tex syntax.
Matches START with a backslash and END with a word constituent
[a-zA-Z0-9].  Uses the prettify functionality of `prog-mode'."

  (not (or (memq (char-before start) '(?\\))
           (memq (char-syntax (or (char-after end) ?\s)) '(?w))
       (nth 8 (syntax-ppss)))) )

(defun prettify-symbols-cluster ()
  "Set keywords and corresponding glyph."
  (setq-local prettify-symbols-alist texsym-cluster)
  (setq prettify-symbols-compose-predicate 'texsym-predicate))

Jan 12, 2022, 05:19 by help-gnu-emacs@gnu.org:

> Is this the way to associate an empty replacement value for "\cr".  When I do not place a space after
> ? I get an error.
>
> (defvar texsym-cluster
>  ("\\alpha" . ?α)  ("\\cr" . ? ))
>