Replace add-to-list to lexical variable with push (bug#39373)

Since 'add-to-list', being a plain function, cannot access lexical
variables, such use must be rewritten for correctness.
(Some instances actually do work thanks to a compiler macro,
but it's not something code should rely on.)

* lisp/autoinsert.el (auto-insert-alist):
* lisp/cedet/mode-local.el (mode-local-print-bindings):
* lisp/net/tramp-cache.el (tramp-flush-connection-properties)
(tramp-list-connections):
* lisp/net/zeroconf.el (zeroconf-list-service-names)
(zeroconf-list-service-types, zeroconf-list-services):
* lisp/org/org.el (org-reload):
* lisp/whitespace.el (whitespace-report-region):
* test/lisp/emacs-lisp/map-tests.el (test-map-do):
Replace add-to-list with push.

7 files changed, 20 insertions, 21 deletions

diff --git a/lisp/autoinsert.el b/lisp/autoinsert.el
index 9bc3aad2785..25961d41089 100644
--- a/lisp/autoinsert.el
+++ b/lisp/autoinsert.el
@@ -171,7 +171,7 @@ If this contains a %s, that will be replaced by the matching rule."
                  (mapatoms (lambda (mode)
                              (let ((name (symbol-name mode)))
                                (when (string-match "-mode$" name)
-                                 (add-to-list 'modes name)))))
+                                 (push name modes)))))
                  (sort modes 'string<)))
      (completing-read "Local variables for mode: " v1 nil t)
      " . (("
diff --git a/lisp/cedet/mode-local.el b/lisp/cedet/mode-local.el
index a6e143cfcd6..a1aea30c20d 100644
--- a/lisp/cedet/mode-local.el
+++ b/lisp/cedet/mode-local.el
@@ -819,14 +819,12 @@ META-NAME is a cons (OVERLOADABLE-SYMBOL . MAJOR-MODE)."
         )
     ;; Order symbols by type
     (mapatoms
-     #'(lambda (s)
-         (add-to-list (cond
-                       ((get s 'mode-variable-flag)
-                        (if (get s 'constant-flag) 'mc 'mv))
-                       ((get s 'override-flag)
-                        (if (get s 'constant-flag) 'fo 'ov))
-                       ('us))
-                      s))
+     (lambda (s) (push s (cond
+                          ((get s 'mode-variable-flag)
+                           (if (get s 'constant-flag) mc mv))
+                          ((get s 'override-flag)
+                           (if (get s 'constant-flag) fo ov))
+                          (t us))))
      table)
     ;; Print symbols by type
     (when us
diff --git a/lisp/net/tramp-cache.el b/lisp/net/tramp-cache.el
index b81a1a23d5f..62e25fa1f08 100644
--- a/lisp/net/tramp-cache.el
+++ b/lisp/net/tramp-cache.el
@@ -373,7 +373,7 @@ used to cache connection properties of the local machine."
    (let ((hash (gethash key tramp-cache-data))
          properties)
      (when (hash-table-p hash)
-       (maphash (lambda (x _y) (add-to-list 'properties x 'append)) hash))
+       (maphash (lambda (x _y) (push x properties)) hash))
      properties))
   (setq tramp-cache-data-changed t)
   (remhash key tramp-cache-data))
@@ -427,7 +427,7 @@ used to cache connection properties of the local machine."
          (when (and (tramp-file-name-p key)
                     (null (tramp-file-name-localname key))
                     (tramp-connection-property-p key "process-buffer"))
-           (add-to-list 'result key)))
+           (push key result)))
        tramp-cache-data)
       result))
 
diff --git a/lisp/net/zeroconf.el b/lisp/net/zeroconf.el
index b8becd712f5..cb3c0f2a7ee 100644
--- a/lisp/net/zeroconf.el
+++ b/lisp/net/zeroconf.el
@@ -256,17 +256,17 @@ supported keys depend on the service type.")
   "Return all discovered Avahi service names as list."
   (let (result)
     (maphash
-     (lambda (_key value) (add-to-list 'result (zeroconf-service-name value)))
+     (lambda (_key value) (push (zeroconf-service-name value) result))
      zeroconf-services-hash)
-    result))
+    (delete-dups result)))
 
 (defun zeroconf-list-service-types ()
   "Return all discovered Avahi service types as list."
   (let (result)
     (maphash
-     (lambda (_key value) (add-to-list 'result (zeroconf-service-type value)))
+     (lambda (_key value) (push (zeroconf-service-type value) result))
      zeroconf-services-hash)
-    result))
+    (delete-dups result)))
 
 (defun zeroconf-list-services (type)
   "Return all discovered Avahi services for a given service type TYPE.
@@ -278,9 +278,9 @@ format of SERVICE."
     (maphash
      (lambda (_key value)
        (when (equal type (zeroconf-service-type value))
-         (add-to-list 'result value)))
+         (push value result)))
      zeroconf-services-hash)
-    result))
+    (delete-dups result)))
 
 (defvar zeroconf-service-added-hooks-hash (make-hash-table :test 'equal)
   "Hash table of hooks for newly added services.
diff --git a/lisp/org/org.el b/lisp/org/org.el
index 5c8b02b9d1f..568f5b9b873 100644
--- a/lisp/org/org.el
+++ b/lisp/org/org.el
@@ -18682,13 +18682,14 @@ With prefix arg UNCOMPILED, load the uncompiled versions."
                               (and (string= org-dir contrib-dir)
                                    (org-load-noerror-mustsuffix (concat contrib-dir f)))
                               (and (org-load-noerror-mustsuffix (concat (org-find-library-dir f) f))
-                                   (add-to-list 'load-uncore f 'append)
+                                   (push f load-uncore)
                                    't)
                               f))
                         lfeat)))
     (when load-uncore
       (message "The following feature%s found in load-path, please check if that's correct:\n%s"
-               (if (> (length load-uncore) 1) "s were" " was") load-uncore))
+               (if (> (length load-uncore) 1) "s were" " was")
+               (reverse load-uncore)))
     (if load-misses
         (message "Some error occurred while reloading Org feature%s\n%s\nPlease check *Messages*!\n%s"
                  (if (> (length load-misses) 1) "s" "") load-misses (org-version nil 'full))
diff --git a/lisp/whitespace.el b/lisp/whitespace.el
index 111b1752632..db7c023324b 100644
--- a/lisp/whitespace.el
+++ b/lisp/whitespace.el
@@ -1684,7 +1684,7 @@ cleaning up these problems."
             (mapcar
              #'(lambda (option)
                  (when force
-                   (add-to-list 'style (car option)))
+                   (push (car option) style))
                  (goto-char rstart)
                  (let ((regexp
                         (cond
diff --git a/test/lisp/emacs-lisp/map-tests.el b/test/lisp/emacs-lisp/map-tests.el
index 06fd55faad3..c52bb83fa33 100644
--- a/test/lisp/emacs-lisp/map-tests.el
+++ b/test/lisp/emacs-lisp/map-tests.el
@@ -227,7 +227,7 @@ Evaluate BODY for each created map.
   (with-maps-do map
     (let ((result nil))
       (map-do (lambda (k v)
-                (add-to-list 'result (list (int-to-string k) v)))
+                (push (list (int-to-string k) v) result))
               map)
       (should (equal result '(("2" 5) ("1" 4) ("0" 3)))))))