* lisp/textmodes: Use lexical-binding

* lisp/textmodes/enriched.el: Use lexical-binding.
(enriched-mode): Use `delete-dups` to avoid `add-to-list` on
a local variable.

* lisp/textmodes/makeinfo.el: Use lexical-binding.
(makeinfo-region): Remove unused var `filename-or-header`.

* lisp/textmodes/refbib.el: Use lexical-binding.
(r2b-put-field): Remove unused var `multi-line`.
(r2b-barf-output): Remove unused var `match`.

* lisp/textmodes/refer.el: Use lexical-binding.
(refer-find-entry-internal): Remove unused vars `old-buffer` and `found`.

* lisp/textmodes/reftex-auc.el: Use lexical-binding.
(LaTeX-add-bibitems): Declare function.
(reftex-plug-into-AUCTeX): Use `add-function` and `advice-add` so we
can properly unplug.

* lisp/textmodes/reftex-cite.el: Use lexical-binding.
(reftex-create-bibtex-file): Remove unused var `file`.
(reftex--found-list): Declare var.
(reftex-offer-bib-menu): Rename local var to `reftex--found-list`.

* lisp/textmodes/reftex-dcr.el: Use lexical-binding.
(reftex-use-itimer-in-xemacs): Delete XEmacs-only var.
(reftex-toggle-auto-view-crossref): Delete XEmacs-only code.
(reftex-start-itimer-once): Delete XEmacs-only function.

* lisp/textmodes/reftex-global.el: Use lexical-binding.
(reftex-isearch-push-state-function): Use a closure instead of `(lambda).

* lisp/textmodes/reftex-index.el: Use lexical-binding.
(mark-active, transient-mark-mode): Delete var declarations.
(reftex-index-mode-map): Remove XEmacs-only code.
Use `mapc` so we can use closures instead of hand-built lambdas.
(reftex-index-next, reftex-index-previous): Tweak interactive spec to
remove unused prefix arg and mark it as a motion command.
(reftex-index-phrases-font-lock-keywords)
(reftex-index-phrases-font-lock-keywords): Move initialization into
declaration.
(reftex-index-initialize-phrases-buffer, reftex-index-phrases-mode)
reftex-index-phrases-apply-to-region: Remove XEmacs-only code.
(TeX-master): Remove redundant declaration.
(reftex--chars-first): Rename dynvar from `chars-first`.  Adjust all uses.

* lisp/textmodes/reftex-parse.el: Use lexical-binding.

* lisp/textmodes/reftex-ref.el: Use lexical-binding.
(reftex-label): Remove always-nil var `text`.
(reftex-refstyle): Declare before first use.
(<toplevel>): Use closures rather than `eval` when building commands from
`reftex-ref-style-alist`.

* lisp/textmodes/reftex-sel.el: Use lexical-binding.
(reftex-select-label-mode-map, reftex-select-bib-mode-map):
Use `mapc` so we can use closures instead of hand-built lambdas.
(reftex-select-label-mode, reftex-select-bib-mode): Remove XEmacs-only code.
(reftex-select-data, reftex-select-prompt, reftex-refstyle):
Move declaration before first use.
(reftex--found-list, reftex--cb-flag, reftex--last-data)
(reftex--call-back, reftex--help-string): Move declaration before use,
and rename by adding `reftext--` prefix.  Adjust all uses in this file.
For `reftex--found-list` adjust corresponding uses in `reftex-cite.el`.
(reftex-select-item): Explicitly let-bind them.
Remove XEmacs-only code.

* lisp/textmodes/reftex-toc.el: Use lexical-binding.
(reftex-toc-mode-map, reftex-toc-mode, reftex-toc-restore-region)
(reftex-toc-next, reftex-toc-previous, reftex-toc-next-heading)
(reftex-toc-previous-heading, reftex-toggle-auto-toc-recenter
(reftex-make-separate-toc-frame): Remove XEmacs-only code.

* lisp/textmodes/reftex-vars.el: Use lexical-binding.

* lisp/textmodes/reftex.el: Use lexical-binding.
(reftex-mode-map, reftex-mode, reftex-fontify-select-label-buffer)
(reftex-verified-face): Remove XEmacs-only code.
(reftex-region-active-p, reftex-overlay-put, reftex-move-overlay)
(reftex-make-overlay, reftex-get-buffer-visiting, reftex-delete-overlay):
Redefine as obsolete aliases.  Replace all callers.
(current-message): Remove XEmacs-only definition.

* lisp/textmodes/remember.el: Use lexical-binding.

* lisp/textmodes/table.el (<toplevel>): Use closures rather than `(lambda)
to build commands.

* lisp/textmodes/texinfmt.el: Use lexical-binding.
(texinfo-example-start): Declare var.
(texinfo-format-region, texinfo-format-buffer-1): Remove unused var
`last-input-buffer`.
(texinfo-format-scan): Use `dlet` to bind `whitespace-silent`.
(texinfo-optional-braces-discard, texinfo-format-parse-line-args)
(texinfo-format-parse-args): Remove unused var `start`.
(texinfo-multitable-widths): Remove unused var `start-of-templates`.
(texinfo-multitable-item): Strength-reduce `eval` to `symbol-value`.
(texinfo-alias): Remove unused vars `start` and `args`.
(texinfo-defun-type symbol-property): Change the car to help the type
symbol rather than an expression returning it.
(texinfo-format-deffn): Remove corresponding `eval`.
(texinfo-clear): Remove unused var `value`.
(texinfo-format-ifeq): Remove unused var `end`.

* lisp/textmodes/texinfo.el: Use lexical-binding.
(tex-show-print-queue): Declare function.

* lisp/textmodes/texnfo-upd.el: Use lexical-binding.
(texinfo-start-menu-description): Remove unused var `end`.
(texinfo-insert-node-lines): Remove unused var `beginning-marker`.
(texinfo-multiple-files-update): Remove unused vars `next-node-name`
and `previous-node-name`.

* lisp/textmodes/two-column.el: Use lexical-binding.

lisp/textmodes/two-column.el

@@ -1,4 +1,4 @@
-;;; two-column.el --- minor mode for editing of two-column text
+;;; two-column.el --- minor mode for editing of two-column text  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1992-1995, 2001-2021 Free Software Foundation, Inc.
 
@@ -165,10 +165,10 @@ minus this value."
 
 (defvar 2C-mode-map
   (let ((map (make-sparse-keymap)))
-    (define-key map "2" '2C-two-columns)
-    (define-key map [f2] '2C-two-columns)
-    (define-key map "b" '2C-associate-buffer)
-    (define-key map "s" '2C-split)
+    (define-key map "2" #'2C-two-columns)
+    (define-key map [f2] #'2C-two-columns)
+    (define-key map "b" #'2C-associate-buffer)
+    (define-key map "s" #'2C-split)
     map)
   "Keymap for commands for setting up two-column mode.")
 
@@ -178,19 +178,19 @@ minus this value."
 ;; This one is for historical reasons and simple keyboards, it is not
 ;; at all mnemonic.  All usual sequences containing 2 were used, and
 ;; f2 could not be set up in a standard way under Emacs 18.
-;;;###autoload (global-set-key "\C-x6" '2C-command)
+;;;###autoload (global-set-key "\C-x6" #'2C-command)
 
-;;;###autoload (global-set-key [f2] '2C-command)
+;;;###autoload (global-set-key [f2] #'2C-command)
 
 (defvar 2C-minor-mode-map
   (let ((map (make-sparse-keymap)))
-    (define-key map "1" '2C-merge)
-    (define-key map "d" '2C-dissociate)
-    (define-key map "o" '2C-associated-buffer)
-    (define-key map "\^m" '2C-newline)
-    (define-key map "|" '2C-toggle-autoscroll)
-    (define-key map "{" '2C-shrink-window-horizontally)
-    (define-key map "}" '2C-enlarge-window-horizontally)
+    (define-key map "1" #'2C-merge)
+    (define-key map "d" #'2C-dissociate)
+    (define-key map "o" #'2C-associated-buffer)
+    (define-key map "\^m" #'2C-newline)
+    (define-key map "|" #'2C-toggle-autoscroll)
+    (define-key map "{" #'2C-shrink-window-horizontally)
+    (define-key map "}" #'2C-enlarge-window-horizontally)
     map)
   "Keymap for commands for use in two-column mode.")
 
@@ -275,7 +275,7 @@ some prefix.
 The appearance of the screen can be customized by the variables
 `2C-window-width', `2C-beyond-fill-column', `2C-mode-line-format' and
 `truncate-partial-width-windows'."
-  (add-hook 'post-command-hook '2C-autoscroll nil t)
+  (add-hook 'post-command-hook #'2C-autoscroll nil t)
   (setq fill-column (- 2C-window-width
 		       2C-beyond-fill-column)
 	mode-line-format 2C-mode-line-format