Remove custom syntax-propertize-function.

The original approach created more problems than it
solved. Additionally, the desired syntax highlighting behavior is
handled gracefully via `rx` and the `rx-constituents` approach I gleaned
from puppet-mode.el.

Author: mattdeboard

elixir-mode.el

@@ -550,8 +550,6 @@ Argument END End of the region."
   (set (make-local-variable 'comment-use-syntax) t)
   (set (make-local-variable 'tab-width) elixir-basic-offset)
   (set (make-local-variable 'imenu-generic-expression) elixir-imenu-generic-expression)
-  (if (boundp 'syntax-propertize-function)
-      (set (make-local-variable 'syntax-propertize-function) 'elixir-syntax-propertize))
   (smie-setup elixir-smie-grammar 'verbose-elixir-smie-rules ; 'elixir-smie-rules
               :forward-token 'elixir-smie-forward-token
               :backward-token 'elixir-smie-backward-token))

elixir-smie.el

@@ -34,32 +34,6 @@
     table)
   "Elixir mode syntax table.")
 
-(defun elixir-syntax-propertize (start end)
-  (save-excursion
-    (goto-char start)
-    ;; The ? character on its own is supposed to escape whatever comes
-    ;; after it (including any escaped chars. Examples: ?\# and ?".
-    (while (search-forward "?" end t)
-      (let ((start (1- (point))))
-        (unless (or (= (char-syntax (char-before (- (point) 1))) ?w)
-                    (= (char-syntax (char-before (- (point) 1))) ?_))
-          (put-text-property (1- (point))
-                             (point)
-                             'syntax-table
-                             '(?|))
-          (when (= (char-after) ?\\)
-            (forward-char)
-            (put-text-property (1- (point))
-                               (point)
-                               'syntax-table
-                               '(?\s)))
-          (forward-char)
-          (put-text-property (1- (point))
-                             (point)
-                             'syntax-table
-                             '(?|))
-          (put-text-property start (point) 'font-lock-face 'font-lock-string-face))))))
-
 (defmacro elixir-smie-debug (message &rest format-args)
   `(progn
      (when elixir-smie-verbose-p