vm_method.c: NameError at refined method alias

* vm_method.c (rb_alias): raise a NameError when creating alias to
  a refined method if the original method of the refined method is
  not defined.  [ruby-core:67523] [Bug #10731]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49221 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 25 insertions, 0 deletions

diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index 7973b1aa60..884d031c87 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -1192,6 +1192,31 @@ class TestRefinement < Test::Unit::TestCase
     end;
   end
 
+  def test_alias_refined_method
+    assert_separately([], <<-"end;")
+    bug10731 = '[ruby-core:67523] [Bug #10731]'
+
+    class C
+    end
+
+    module RefinementBug
+      refine C do
+        def foo
+        end
+
+        def bar
+        end
+      end
+    end
+
+    assert_raise(NameError, bug10731) do
+      class C
+        alias foo bar
+      end
+    end
+    end;
+  end
+
   private
 
   def eval_using(mod, s)