Suppress some unused lexical variable warnings in eshell

* lisp/eshell/em-tramp.el (eshell/sudo):
* lisp/eshell/em-unix.el (eshell/time):
* lisp/eshell/esh-var.el (eshell/env):
Pretend to use "args" to quieten compiler.

lisp/eshell/em-tramp.el

@@ -109,6 +109,7 @@ Uses the system sudo through TRAMP's sudo method."
        :show-usage
        :usage "[(-u | --user) USER] COMMAND
 Execute a COMMAND as the superuser or another USER.")
+     args                 ; suppress "unused lexical variable" warning
      (throw 'eshell-external
 	    (let ((user (or user "root"))
 		  (host (or (file-remote-p default-directory 'host)

lisp/eshell/em-unix.el

@@ -956,6 +956,7 @@ Summarize disk usage of each FILE, recursively for directories.")
        :show-usage
        :usage "COMMAND...
 Show wall-clock time elapsed during execution of COMMAND.")
+     args                 ; suppress "unused lexical variable" warning
      (setq eshell-time-start (float-time))
      (add-hook 'eshell-post-command-hook 'eshell-show-elapsed-time nil t)
      ;; after setting

lisp/eshell/esh-opt.el

@@ -111,6 +111,7 @@ interned variable `args' (created using a `let' form)."
                                ;; `options' is of the form (quote OPTS).
                                (cadr options))))
           (args processed-args))
+     ;; Unused lexical variable warning if body does not use `args'.
      ,@body-forms))
 
 ;;; Internal Functions:

lisp/eshell/esh-var.el

@@ -343,6 +343,8 @@ This function is explicit for adding to `eshell-parse-argument-hook'."
 					       obarray 'boundp))
 	      (pcomplete-here))))
 
+;; FIXME the real "env" command does more than this, it runs a program
+;; in a modified environment.
 (defun eshell/env (&rest args)
   "Implementation of `env' in Lisp."
   (eshell-init-print-buffer)
@@ -351,6 +353,7 @@ This function is explicit for adding to `eshell-parse-argument-hook'."
    '((?h "help" nil nil "show this usage screen")
      :external "env"
      :usage "<no arguments>")
+   args                   ; suppress "unused lexical variable" warning
    (dolist (setting (sort (eshell-environment-variables) 'string-lessp))
      (eshell-buffered-print setting "\n"))
    (eshell-flush)))