From 0543b90d0f6a87e3a87f747c584c0d6737f221d4 Mon Sep 17 00:00:00 2001
From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 11 Mar 2017 17:22:39 +0000
Subject: merge revision(s) 57362: [Backport #13096]

	vm_method.c: resolve refined method to undef

	* vm_method.c (rb_undef): resolve the method entry which refines a
	  prepended method entry.  [ruby-core:78944] [Bug #13096]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@57862 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_refinement.rb | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'test')

diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index 8af9945080..66202cda11 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -1474,6 +1474,25 @@ class TestRefinement < Test::Unit::TestCase
     INPUT
   end
 
+  def test_undef_prepended_method
+    bug13096 = '[ruby-core:78944] [Bug #13096]'
+    klass = EnvUtil.labeled_class("X") do
+      def foo; end
+    end
+    klass.prepend(Module.new)
+    ext = EnvUtil.labeled_module("Ext") do
+      refine klass do
+        def foo
+        end
+      end
+    end
+    assert_nothing_raised(NameError, bug13096) do
+      klass.class_eval do
+        undef :foo
+      end
+    end
+  end
+
   def test_call_refined_method_in_duplicate_module
     bug10885 = '[ruby-dev:48878]'
     assert_in_out_err([], <<-INPUT, [], [], bug10885)
-- 
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