merge revision(s) 43334: [Backport #9030]

	* vm_insnhelper.c (vm_call_method): set ci->me to 0 when the
	  original method of a refined method is undef to avoid SEGV.

	* vm_method.c (rb_method_entry_without_refinements): return 0 when
	  the original method of a refined method is undef to avoid SEGV.

	* test/ruby/test_refinement.rb: related test.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@43345 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 50 insertions, 0 deletions

diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index b9d9c3e30d..2110221fc1 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -905,6 +905,56 @@ class TestRefinement < Test::Unit::TestCase
     INPUT
   end
 
+  def test_refine_undefed_method_and_call
+    assert_in_out_err([], <<-INPUT, ["NoMethodError"], [])
+      $VERBOSE = nil #to suppress warning "Refinements are experimental, ..."
+      class Foo
+        def foo
+        end
+
+        undef foo
+      end
+
+      module FooExt
+        refine Foo do
+          def foo
+          end
+        end
+      end
+
+      begin
+        Foo.new.foo
+      rescue => e
+        p e.class
+      end
+    INPUT
+  end
+
+  def test_refine_undefed_method_and_send
+    assert_in_out_err([], <<-INPUT, ["NoMethodError"], [])
+      $VERBOSE = nil #to suppress warning "Refinements are experimental, ..."
+      class Foo
+        def foo
+        end
+
+        undef foo
+      end
+
+      module FooExt
+        refine Foo do
+          def foo
+          end
+        end
+      end
+
+      begin
+        Foo.new.send(:foo)
+      rescue => e
+        p e.class
+      end
+    INPUT
+  end
+
   private
 
   def eval_using(mod, s)