[ruby-core:98824] [Ruby master Bug#11669] inconsitent behavior of refining frozen class

Issue #11669 has been updated by byroot (Jean Boussier).


> How about to simply prohibit `refine` on frozen class?

Conceptually that sounds weird. Freezing a class is to prevent it from being mutated, but refinements are supposed to be a way to extend a class for yourself without mutating it.

----------------------------------------
Bug #11669: inconsitent behavior of refining frozen class
https://bugs.ruby-lang.org/issues/11669#change-86187

* Author: naruse (Yui NARUSE)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* ruby -v: ruby 2.3.0dev (2015-10-26 trunk 52291) [x86_64-darwin15]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
Is this expected behavior?

```ruby
class C
  def foo
    p 1
  end
end
module Foo
  refine C do
    def foo
      p 2
    end
  end
end
using Foo
C.new.foo #=> 2
C.freeze
module Foo
  refine C do
    def foo
      p 3
    end
    def bar #=>  can't modify frozen class (RuntimeError)
      p 3
    end
  end
end
C.new.foo
C.new.bar
```

```
ruby 2.3.0dev (2015-10-26 trunk 52291) [x86_64-darwin15]
2
test.rb:21:in `block in <module:Foo>': can't modify frozen class (RuntimeError)
	from test.rb:17:in `refine'
	from test.rb:17:in `<module:Foo>'
	from test.rb:16:in `<main>'
```



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