Bug #21318: Namespaces leak with Module.nesting

• Status: Open
• Assignee: -
• Target version: -
• Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN

[fxn (Xavier Noria)]

Namespaces are not transparent for this program:

Module.nesting

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

[fxn (Xavier Noria)]

• Subject changed from Namespaces leak with permanent names to Namespaces leak with Module.nesting

[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>]