Fix refinement modification of method visibility in superclass

Previously, this didn't work correctly, resulting in a
SystemStackError. This fixes the issue by finding the related
superclass method entry, and updating the orig_me in the
refinement method to point to the superclass method.

Fixes [Bug #21446]

1 files changed, 23 insertions, 0 deletions

diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index bdc6667b8e..209e55294b 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -1933,6 +1933,29 @@ class TestRefinement < Test::Unit::TestCase
     end;
   end
 
+  def test_public_in_refine_for_method_in_superclass
+    assert_separately([], "#{<<-"begin;"}\n#{<<-"end;"}")
+    begin;
+      bug21446 = '[ruby-core:122558] [Bug #21446]'
+
+      class CowSuper
+        private
+        def moo() "Moo"; end
+      end
+      class Cow < CowSuper
+      end
+
+      module PublicCows
+        refine(Cow) {
+          public :moo
+        }
+      end
+
+      using PublicCows
+      assert_equal("Moo", Cow.new.moo, bug21446)
+    end;
+  end
+
   module SuperToModule
     class Parent
     end