[ruby-core:71423] [Ruby trunk - Bug #11672] [Open] refinement

Issue #11672 has been reported by Akira Tanaka.

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Bug #11672: refinement 
https://bugs.ruby-lang.org/issues/11672

* Author: Akira Tanaka
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0dev (2015-11-10 trunk 52511) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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I found following script behaves different between ruby 2.2.3 and trunk.
Is this difference intentional?

```
% cat tst.rb   
class C
end

module R
  refine C do
    def m
      puts :foo
    end
  end
end

using R
C.new.m

module R
  refine C do
    def m
      puts :bar
    end
  end
end

C.new.m
% ./ruby -wv tst.rb  
ruby 2.3.0dev (2015-11-10 trunk 52511) [x86_64-linux]
foo
foo
% ruby-2.2.3 -wv tst.rb
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
foo
tst.rb:17: warning: method redefined; discarding old m
tst.rb:6: warning: previous definition of m was here
bar
```





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