[ruby-core:101400] [Ruby master Bug#17379] Refinement with modules redefinition bug

Issue #17379 has been updated by marcandre (Marc-Andre Lafortune).


Probably same bug, without `using`, found by Daniel DeLorme:

```ruby
class Foo
  def foo
    p :hello
  end
end

module Code
  def foo
    p :A
  end
end

module Extension
  refine Foo do
    prepend Code
  end
end

Foo.new.foo unless ENV['SKIP'] # => :hello (ok)
Foo.prepend Code
Foo.new.foo     # => depends (not ok)
```
gives:
```
$ ruby refinement.rb
:hello
:hello
$ SKIP=t ruby refinement.rb
:A
```

----------------------------------------
Bug #17379: Refinement with modules redefinition bug
https://bugs.ruby-lang.org/issues/17379#change-89160

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: shugo (Shugo Maeda)
* ruby -v: ruby 3.0.0dev (2020-12-05T10:40:00Z master 9dbb2bfd73) [x86_64-darwin18]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Depending on the circumstance, a refinement can be modified even after being used:

```ruby
def foo
  [:base]
end

module M
  def foo
    super << :M
  end
end

module Ext
  refine Object do
    include M
  end
end

using Ext

p 'asd'.foo unless ENV['SKIP'] # => [:base, :M] (ok)

module M
  def foo
    super << :new_ref
  end
end

p 'asd'.foo # => depends (not ok)
```

Running this gives:
```
$ ruby refinement.rb
[:base, :M]
[:base, :M] # => ok
$ SKIP=t ruby refinement.rb
[:base, :new_ref]  # => should be [:base, :M]
```



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