From: "znz (Kazuhiro NISHIYAMA) via ruby-core" <ruby-core@...>
Date: 2023-08-08T08:52:44+00:00
Subject: [ruby-core:114357] [Ruby master Bug#19833] Superclass of BasicObject is broken.

Issue #19833 has been updated by znz (Kazuhiro NISHIYAMA).


I can reproduce since 3.2.

```
$ docker run --platform linux/amd64 --rm -it ghcr.io/ruby/all-ruby env LANG=C.UTF-8 ALL_RUBY_SINCE=ruby-1.9 ./all-ruby -e 'class BasicObject; include ::Module.new; p superclass; end'
ruby-1.9.0-0        nil
...
ruby-3.2.0-preview1 nil
ruby-3.2.0-preview2 16
...
ruby-3.3.0-preview1 16
```

----------------------------------------
Bug #19833: Superclass of BasicObject is broken.
https://bugs.ruby-lang.org/issues/19833#change-104099

* Author: ksss (Yuki Kurihara)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0dev (2023-08-08T00:21:45Z master 69292676a2) [arm64-darwin22]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
I encountered a phenomenon where a non-class object appeared in the superclass of BasicObject.

The minimum reproduction code is below.

```rb
module Mod
end

BasicObject.include Mod
# or BasicObject.prepend Mod

p BasicObject.superclass
#=> 2431129 or false
```

I think it is a practical problem because I found it by running code that monitors `singleton_method_added` as follows.

https://github.com/ksss/orthoses/blob/341019c78ba625bc5d36c0f359c7d88621990f78/lib/orthoses/lazy_trace_point.rb#L35-L48



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