[ruby-core:121984] [Ruby Bug#21320] Namespaces leak with constant lookup

Issue #21320 has been updated by Eregon (Benoit Daloze).


Full repro:
```
# Copy the description program to program.rb, e.g. $ xsel -b > program.rb
$ RUBY_NAMESPACE=1 ruby -ve 'puts "in main"; require "./program"; puts "in namespace"; Namespace.new.require "./program"' 
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.
in main
:super
in namespace
:top
```

----------------------------------------
Bug #21320: Namespaces leak with constant lookup
https://bugs.ruby-lang.org/issues/21320#change-113100

* Author: fxn (Xavier Noria)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
The following program

```ruby
X = :top

class C
  X = :super
end

class D < C
  p X
end
```

prints `:super` normally, and `:top` if running under a namespace.



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