merge revision(s) 49685,49687: [Backport #10885]

	* vm_insnhelper.c (rb_vm_rewrite_cref_stack): copy nd_refinements
	  of orignal crefs. It fixes segmentation fault when calling
	  refined method in duplicate module. [ruby-dev:48878] [Bug #10885]

	* vm_core.h, class.c: change accordingly.

	* test/ruby/test_refinement.rb: add a test for above.
	  of original crefs. It fixes segmentation fault when calling


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@49708 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 28 insertions, 0 deletions

diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index 3d703e5a3b..1078209af3 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -1387,6 +1387,34 @@ class TestRefinement < Test::Unit::TestCase
                    :foo, bug10826)
   end
 
+  def test_call_refined_method_in_duplicate_module
+    bug10885 = '[ruby-dev:48878]'
+    assert_in_out_err([], <<-INPUT, [], [], bug10885)
+      module M
+        refine Object do
+          def raise
+            # do nothing
+          end
+        end
+
+        class << self
+          using M
+          def m0
+            raise
+          end
+        end
+
+        using M
+        def M.m1
+          raise
+        end
+      end
+
+      M.dup.m0
+      M.dup.m1
+    INPUT
+  end
+
   private
 
   def eval_using(mod, s)