Highlight more Module methods

* lisp/progmodes/ruby-mode.el (ruby-font-lock-keywords): Highlight more
Module methods.

Fixes: debbugs:17216

1 files changed, 4 insertions, 0 deletions

diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index 6c6cdd3427d..912736707ef 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -2065,6 +2065,10 @@ See `font-lock-syntax-table'.")
           "include"
           "module_function"
           "prepend"
+          "private_class_method"
+          "private_constant"
+          "public_class_method"
+          "public_constant"
           "refine"
           "using")
         'symbols))