From: "tagomoris (Satoshi Tagomori) via ruby-core" <ruby-core@...>
Date: 2025-12-09T12:52:32+00:00
Subject: [ruby-core:124098] [Ruby Bug#21316] Namespaces leak with permanent names

Issue #21316 has been updated by tagomoris (Satoshi Tagomori).


Now the name of classes defined in a box is just its name.

```
MBA:build s-tagomori$ RUBY_BOX=1 ./exe/ruby -e 'Ruby::Box.new.eval("class C; end; p(name: C.name, eq: C.name == \"C\")")'
./exe/ruby: warning: Ruby::Box is experimental, and the behavior may change in the future!
See doc/language/box.md for known issues, etc.
{name: "C", eq: true}
MBA:build s-tagomori$ RUBY_BOX=1 ./exe/ruby -v
ruby 4.0.0dev (2025-12-09T12:29:36Z box-news-documents.. c998717de8) +PRISM [arm64-darwin24]
MBA:build s-tagomori$ 
./exe/ruby: warning: Ruby::Box is experimental, and the behavior may change in the future!
See doc/language/box.md for known issues, etc.
{name: "C", eq: true}
MBA:build s-tagomori$ RUBY_BOX=1 ./exe/ruby -v
ruby 4.0.0dev (2025-12-09T12:29:36Z box-news-documents.. c998717de8) +PRISM [arm64-darwin24]
```

----------------------------------------
Bug #21316: Namespaces leak with permanent names
https://bugs.ruby-lang.org/issues/21316#change-115542

* Author: fxn (Xavier Noria)
* Status: Closed
* Assignee: tagomoris (Satoshi Tagomori)
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Namespaces are not transparent for this program

```ruby
C = Class.new
C.name == 'C'
```

because under a non-main user namespace, the name of `C` has the namespace as a prefix.



-- 
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