[ruby-core:124263] [Ruby Bug#21446] StackOverflow when changing visibility in reopened refinement

16 Dec 2025

      Issue #21446 has been updated by k0kubun (Takashi Kokubun).

Backport changed from 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED to 3.2: REQUIRED, 3.3: REQUIRED, 3.4: DONE

ruby_3_4 commit:7edff469e14541a480a6156efc1cc6e3b526e7bd merged revision(s) commit:1e7cf7b2bc1f9b356b2e980e1e18548618da6363.

----------------------------------------
Bug #21446: StackOverflow when changing visibility in reopened refinement
https://bugs.ruby-lang.org/issues/21446#change-115757

* Author: luke-gru (Luke Gruber)
* Status: Closed
* ruby -v: 3.5.0
* Backport: 3.2: REQUIRED, 3.3: REQUIRED, 3.4: DONE
----------------------------------------
```ruby
class A
  def a
    :a
  end
end
class B < A
end

module R
  refine B do
    private :a
  end
end
module R
  refine B do
    public :a
  end
end
using R
B.new.a # StackOverflow
```

I would expect it to change the visibility, not to overflow the stack.

-- 
https://bugs.ruby-lang.org/