Use lexical binding for ediff

* lisp/vc/ediff-diff.el:
* lisp/vc/ediff-help.el:
* lisp/vc/ediff-hook.el:
* lisp/vc/ediff-init.el:
* lisp/vc/ediff-merg.el:
* lisp/vc/ediff-vers.el:
* lisp/vc/ediff-wind.el:
* lisp/vc/ediff-mult.el:
* lisp/vc/ediff-ptch.el:
* lisp/vc/ediff.el: Use lexical binding.
(ediff-version): Increase.
(ediff-date): Remove.

lisp/vc/ediff-diff.el

@@ -1,4 +1,4 @@
-;;; ediff-diff.el --- diff-related utilities
+;;; ediff-diff.el --- diff-related utilities  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1994-2019 Free Software Foundation, Inc.
 

lisp/vc/ediff-help.el

@@ -1,4 +1,4 @@
-;;; ediff-help.el --- Code related to the contents of Ediff help buffers
+;;; ediff-help.el --- Code related to the contents of Ediff help buffers  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1996-2019 Free Software Foundation, Inc.
 
@@ -30,6 +30,7 @@
 ;; end pacifier
 
 (require 'ediff-init)
+(defvar ediff-multiframe)
 
 ;; Help messages
 

lisp/vc/ediff-hook.el

@@ -1,4 +1,4 @@
-;;; ediff-hook.el --- setup for Ediff's menus and autoloads
+;;; ediff-hook.el --- setup for Ediff's menus and autoloads  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1995-2019 Free Software Foundation, Inc.
 

lisp/vc/ediff-init.el

@@ -1,4 +1,4 @@
-;;; ediff-init.el --- Macros, variables, and defsubsts used by Ediff
+;;; ediff-init.el --- Macros, variables, and defsubsts used by Ediff  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1994-2019 Free Software Foundation, Inc.
 

lisp/vc/ediff-merg.el

@@ -1,4 +1,4 @@
-;;; ediff-merg.el --- merging utilities
+;;; ediff-merg.el --- merging utilities  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1994-2019 Free Software Foundation, Inc.
 

lisp/vc/ediff-mult.el

@@ -1,4 +1,4 @@
-;;; ediff-mult.el --- support for multi-file/multi-buffer processing in Ediff
+;;; ediff-mult.el --- support for multi-file/multi-buffer processing in Ediff  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1995-2019 Free Software Foundation, Inc.
 
@@ -714,7 +714,7 @@ behavior."
 ;; we may visit them recursively.  DIR1 is the directory to inspect.
 ;; MERGE-AUTOSTORE-DIR is the directory where to auto-store the results of
 ;; merges.  Can be nil.
-(defun ediff-get-directory-files-under-revision (jobname
+(defun ediff-get-directory-files-under-revision (_jobname
 						 regexp dir1
 						 &optional merge-autostore-dir)
   (let (lis1 elt common auxdir1)
@@ -760,7 +760,7 @@ behavior."
 				      auxdir1 nil nil
 				      merge-autostore-dir nil)
      (mapcar (lambda (elt) (ediff-make-new-meta-list-element
-			    (expand-file-name (concat auxdir1 elt)) nil nil))
+		       (expand-file-name (concat auxdir1 elt)) nil nil))
 	     common))
     ))
 
@@ -798,8 +798,8 @@ behavior."
 ;; Prepare meta-buffer in accordance with the argument-function and
 ;; redraw-function.  Must return the created  meta-buffer.
 (defun ediff-prepare-meta-buffer (action-func meta-list
-				  meta-buffer-name redraw-function
-				  jobname &optional startup-hooks)
+				              meta-buffer-name redraw-function
+				              jobname &optional _startup-hooks)
   (let* ((meta-buffer-name
 	  (ediff-unique-buffer-name meta-buffer-name "*"))
 	 (meta-buffer (get-buffer-create meta-buffer-name)))
@@ -1583,8 +1583,7 @@ Useful commands:
 
 ;; Returns whether session was marked or unmarked
 (defun ediff-mark-session-for-hiding (info unmark)
-  (let ((session-buf (ediff-get-session-buffer info))
-	ignore)
+  (let (ignore)
     (cond ((eq unmark 'mark) (setq unmark nil))
 	  ((eq (ediff-get-session-status info) ?H) (setq unmark t))
 	  (unmark  ; says unmark, but the marker is different from H

lisp/vc/ediff-ptch.el

@@ -1,4 +1,4 @@
-;;; ediff-ptch.el --- Ediff's  patch support
+;;; ediff-ptch.el --- Ediff's  patch support  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1996-2019 Free Software Foundation, Inc.
 

lisp/vc/ediff-vers.el

@@ -1,4 +1,4 @@
-;;; ediff-vers.el --- version control interface to Ediff
+;;; ediff-vers.el --- version control interface to Ediff  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1995-1997, 2001-2019 Free Software Foundation, Inc.
 

lisp/vc/ediff-wind.el

@@ -1,4 +1,4 @@
-;;; ediff-wind.el --- window manipulation utilities
+;;; ediff-wind.el --- window manipulation utilities  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1994-1997, 2000-2019 Free Software Foundation, Inc.
 

lisp/vc/ediff.el

@@ -1,21 +1,18 @@
-;;; ediff.el --- a comprehensive visual interface to diff & patch
+;;; ediff.el --- a comprehensive visual interface to diff & patch  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 1994-2019 Free Software Foundation, Inc.
 
 ;; Author: Michael Kifer <kifer@cs.stonybrook.edu>
 ;; Created: February 2, 1994
 ;; Keywords: comparing, merging, patching, vc, tools, unix
-;; Version: 2.81.4
+;; Version: 2.81.6
+(defconst ediff-version "2.81.6" "The current version of Ediff")
 
 ;; Yoni Rabkin <yoni@rabkins.net> contacted the maintainer of this
 ;; file on 20/3/2008, and the maintainer agreed that when a bug is
 ;; filed in the Emacs bug reporting system against this file, a copy
 ;; of the bug report be sent to the maintainer's email address.
 
-(defconst ediff-version "2.81.5" "The current version of Ediff")
-(defconst ediff-date "July 4, 2013" "Date of last update")
-
-
 ;; This file is part of GNU Emacs.
 
 ;; GNU Emacs is free software: you can redistribute it and/or modify
@@ -1546,7 +1543,7 @@ When called interactively, displays the version."
           (interactive-p)
         (called-interactively-p 'interactive))
       (message "%s" (ediff-version))
-    (format "Ediff %s of %s" ediff-version ediff-date)))
+    (format "Ediff %s" ediff-version)))
 
 ;; info is run first, and will autoload info.el.
 (declare-function Info-goto-node "info" (nodename &optional fork strict-case))