Issue #14671 has been updated by jeremyevans0 (Jeremy Evans).

Status changed from Open to Rejected

This is because Class undefs `refine`, and the refinement for Module is after the lookup chain for Class.  Your code works fine if you call `refine` on a Module and not a Class, or if you remove the `undef` from Class. Ruby does not support directly removing an `undef` through `remove_method`, but you can override the method and remove the overridden method.  This code:

```ruby
using Module.new {
  refine Module do
    def refine *;
      puts self
    end
    public :refine
  end
}
Enumerable.refine

Class.define_method(:refine){}
Class.remove_method(:refine)
Object.refine
```

prints:

```
Enumerable
Object
```

Your code also works if you refine Class instead of Module.

----------------------------------------
Bug #14671: Refining Module#refine itself introduces strange state
https://bugs.ruby-lang.org/issues/14671#change-85933

* Author: shyouhei (Shyouhei Urabe)
* Status: Rejected
* Priority: Normal
* ruby -v: ruby 2.6.0dev (2018-04-09 trunk 63122) [x86_64-darwin15]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
```ruby
using Module.new {
  refine Module do
    def refine *;
      puts self
    end
    public :refine
  end
}
Object.refine # => NoMethodError
```

It is possible to refine Module#refine, but there seems to be no way to call it.



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