From: "byroot (Jean Boussier)" <noreply@...>
Date: 2022-12-01T08:09:04+00:00
Subject: [ruby-core:111116] [Ruby master Bug#19164] [3.2.0dev] Freezing an object can prevent removing methods on its class

Issue #19164 has been reported by byroot (Jean Boussier).

----------------------------------------
Bug #19164: [3.2.0dev] Freezing an object can prevent removing methods on its class
https://bugs.ruby-lang.org/issues/19164

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* Target version: 3.2
* ruby -v: ruby 3.2.0dev (2022-11-30T08:20:38Z master c8bfbbc25e) [arm64-darwin22]
* Backport: 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED
----------------------------------------
The following snippet showcase the bug. It passes on 3.1 and older, but fails on 3.2.0

```ruby
klass = Class.new
klass.prepend(Module.new)

klass.new.freeze
klass.class_eval do
  define_method(:bar) {} # works
  remove_method(:bar) # raise FrozenError
end
```

Bisecting with this script points me to [e7b1ff984fde859a7778dec564731eb79392406f](https://github.com/ruby/ruby/commit/e7b1ff984fde859a7778dec564731eb79392406f), which suggest some part of the codebase might be misusing some user flags.

I have a patch that fix this script but I doubt it's the right fix, I'll be working with @jemmai and @tenderlovemaking to find a proper fix.

I'm opening this ticket to make sure it's addressed before the 3.2.0 final release.



-- 
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