[ruby-core:121980] [Ruby Bug#21318] Namespaces leak with Module.nesting

Issue #21318 has been updated by Eregon (Benoit Daloze).


Complete reproducer:
```
$ RUBY_NAMESPACE=1 ruby -ve 'p Module.nesting; ns = Namespace.new; File.write "ns.rb", "p Module.nesting"; ns.require "./ns"'
ruby 3.5.0dev (2025-05-10T07:50:29Z namespace-on-read-.. bd4f57f96b) +PRISM [x86_64-linux]
ruby: warning: Namespace is experimental, and the behavior may change in the future!
See doc/namespace.md for know issues, etc.
[]
[#<Namespace:24,user,optional>]
```

----------------------------------------
Bug #21318: Namespaces leak with Module.nesting
https://bugs.ruby-lang.org/issues/21318#change-113097

* Author: fxn (Xavier Noria)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Namespaces are not transparent for this program:

```ruby
Module.nesting
```

The nesting is empty or not depending on whether it is being executed under a namespace.



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