From: "hsbt (Hiroshi SHIBATA) via ruby-core" <ruby-core@...>
Date: 2026-03-24T05:20:41+00:00
Subject: [ruby-core:125107] [Ruby Bug#21446] StackOverflow when changing visibility in reopened refinement

Issue #21446 has been updated by hsbt (Hiroshi SHIBATA).

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

ruby_3_3 commit:3a5fdc8f7c2f158bfad573ff4d2aef0a9cf9c0ee merged revision(s) commit:1e7cf7b2bc1f9b356b2e980e1e18548618da6363.

----------------------------------------
Bug #21446: StackOverflow when changing visibility in reopened refinement
https://bugs.ruby-lang.org/issues/21446#change-116821

* Author: luke-gru (Luke Gruber)
* Status: Closed
* ruby -v: 3.5.0
* Backport: 3.2: REQUIRED, 3.3: DONE, 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.



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