commit 423d6a6156cea32757f13277e31a5867aec12dca (HEAD, refs/remotes/origin/master)
Author: Paul Eggert <eggert@cs.ucla.edu>
Date:   Fri Apr 1 01:24:55 2016 -0700

    Fix check for subscript errors in module calls
    
    * src/emacs-module.c (check_vec_index): New function.
    (module_vec_set, module_vec_get): Use it instead of a
    not-strict-enough check.

diff --git a/src/emacs-module.c b/src/emacs-module.c
index f9ede84..b57636e 100644
--- a/src/emacs-module.c
+++ b/src/emacs-module.c
@@ -588,13 +588,21 @@ module_set_user_finalizer (emacs_env *env, emacs_value uptr,
 }
 
 static void
+check_vec_index (Lisp_Object lvec, ptrdiff_t i)
+{
+  CHECK_VECTOR (lvec);
+  if (! (0 <= i && i < ASIZE (lvec)))
+    args_out_of_range_3 (make_fixnum_or_float (i),
+			 make_number (0), make_number (ASIZE (lvec) - 1));
+}
+
+static void
 module_vec_set (emacs_env *env, emacs_value vec, ptrdiff_t i, emacs_value val)
 {
   /* FIXME: This function should return bool because it can fail.  */
   MODULE_FUNCTION_BEGIN ();
   Lisp_Object lvec = value_to_lisp (vec);
-  CHECK_VECTOR (lvec);
-  CHECK_RANGED_INTEGER (make_number (i), 0, ASIZE (lvec) - 1);
+  check_vec_index (lvec, i);
   ASET (lvec, i, value_to_lisp (val));
 }
 
@@ -603,8 +611,7 @@ module_vec_get (emacs_env *env, emacs_value vec, ptrdiff_t i)
 {
   MODULE_FUNCTION_BEGIN (module_nil);
   Lisp_Object lvec = value_to_lisp (vec);
-  CHECK_VECTOR (lvec);
-  CHECK_RANGED_INTEGER (make_number (i), 0, ASIZE (lvec) - 1);
+  check_vec_index (lvec, i);
   return lisp_to_value (AREF (lvec, i));
 }
 

commit 750e1e19429cd781e2e60b462d19ef827d4da943
Author: Simen Heggestøyl <simenheg@gmail.com>
Date:   Thu Mar 31 21:18:00 2016 +0200

    Support completion of bang-rules in CSS mode
    
    lisp/textmodes/css-mode.el (css--bang-ids): New buffer-local variable
    holding the list of bang-rules for the current mode.
    (css--font-lock-keywords): Retrieve bang-rules from `css--bang-ids'
    instead of computing them.
    (css--complete-bang-rule): New function for completing a bang-rule.
    (css-completion-at-point): Add support for completing bang-rules.
    (scss-font-lock-keywords): Change from a variable to a function in
    order to recompute `css--font-lock-keywords' when `css--bang-ids' has
    changed.
    (scss-mode): Set `css--bang-ids' and recompute font-lock keywords.

diff --git a/etc/NEWS b/etc/NEWS
index 66777e9..726b4b9 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -144,8 +144,8 @@ different group ID.
 ** CSS mode
 
 ---
-*** Support for completing attribute values using the 'completion-at-point'
-command.
+*** Support for completing attribute values and bang-rules using the
+'completion-at-point' command.
 
 
 * New Modes and Packages in Emacs 25.2
diff --git a/lisp/textmodes/css-mode.el b/lisp/textmodes/css-mode.el
index fd3459e..cbef3d4 100644
--- a/lisp/textmodes/css-mode.el
+++ b/lisp/textmodes/css-mode.el
@@ -64,6 +64,10 @@
   '("default" "global" "optional")
   "Additional identifiers that appear in the form !foo in SCSS.")
 
+(defvar css--bang-ids css-bang-ids
+  "List of bang-rules for the current mode.")
+(make-variable-buffer-local 'css--bang-ids)
+
 (defconst css-descriptor-ids
   '("ascent" "baseline" "bbox" "cap-height" "centerline" "definition-src"
     "descent" "font-family" "font-size" "font-stretch" "font-style"
@@ -600,9 +604,7 @@ cannot be completed sensibly: `angle', `element-reference',
   "Face to use for vendor-specific properties.")
 
 (defun css--font-lock-keywords (&optional sassy)
-  `((,(concat "!\\s-*"
-              (regexp-opt (append (if sassy scss-bang-ids)
-                                  css-bang-ids)))
+  `((,(concat "!\\s-*" (regexp-opt css--bang-ids))
      (0 font-lock-builtin-face))
     ;; Atrules keywords.  IDs not in css-at-ids are valid (ignored).
     ;; In fact the regexp should probably be
@@ -732,6 +734,14 @@ cannot be completed sensibly: `angle', `element-reference',
         (when (memq (char-before) '(?\{ ?\;))
           (list start pos css-property-ids))))))
 
+(defun css--complete-bang-rule ()
+  "Complete bang-rule at point."
+  (save-excursion
+    (let ((pos (point)))
+      (skip-chars-backward "-[:alnum:]")
+      (when (eq (char-before) ?\!)
+        (list (point) pos css--bang-ids)))))
+
 (defun css--complete-pseudo-element-or-class ()
   "Complete pseudo-element or pseudo-class at point."
   (save-excursion
@@ -798,8 +808,9 @@ the string PROPERTY."
 (defun css-completion-at-point ()
   "Complete current symbol at point.
 Currently supports completion of CSS properties, property values,
-pseudo-elements, pseudo-classes, and at-rules."
+pseudo-elements, pseudo-classes, at-rules, and bang-rules."
   (or (css--complete-property)
+      (css--complete-bang-rule)
       (css--complete-property-value)
       (css--complete-pseudo-element-or-class)
       (css--complete-at-rule)))
@@ -937,7 +948,7 @@ pseudo-elements, pseudo-classes, and at-rules."
     (modify-syntax-entry ?$ "'" st)
     st))
 
-(defvar scss-font-lock-keywords
+(defun scss-font-lock-keywords ()
   (append `((,(concat "$" css-ident-re) (0 font-lock-variable-name-face)))
           (css--font-lock-keywords 'sassy)
           `((,(concat "@mixin[ \t]+\\(" css-ident-re "\\)[ \t]*(")
@@ -958,7 +969,9 @@ pseudo-elements, pseudo-classes, and at-rules."
   (setq-local comment-continue " *")
   (setq-local comment-start-skip "/[*/]+[ \t]*")
   (setq-local comment-end-skip "[ \t]*\\(?:\n\\|\\*+/\\)")
-  (setq-local font-lock-defaults '(scss-font-lock-keywords nil t)))
+  (setq-local css--bang-ids (append css-bang-ids scss-bang-ids))
+  (setq-local font-lock-defaults
+              (list (scss-font-lock-keywords) nil t)))
 
 (provide 'css-mode)
 ;;; css-mode.el ends here