ruby-mode.el differentiate symbols from ordinary variables

ruby-mode.el.diff

git diff
diff --git a/ruby-mode.el b/ruby-mode.el
index b556e95..838d811 100644
--- a/ruby-mode.el
+++ b/ruby-mode.el
@@ -1169,7 +1169,7 @@ balanced expression is found."
        2 font-lock-type-face)
      ;; symbols
      '("\\(^\\|[^:]\\)\\(:\\([-+~]@?\\|[/%&|^`]\\|\\*\\*?\\|<\\(<\\|=>?\\)?\\|>[>=]?\\|===?\\|=~\\|\\[\\]=?\\|\\(\\w\\|_\\)+\\([!?=]\\|\\b_*\\)\\|#{[^}\n\\\\]*\\(\
-       2 font-lock-reference-face)
+       2 font-lock-string-face)
      ;; expression expansion
      '("#\\({[^}\n\\\\]*\\(\\\\.[^}\n\\\\]*\\)*}\\|\\(\\$\\|@\\|@@\\)\\(\\w\\|_\\)+\\)"
        0 font-lock-variable-name-face t)