Bug #21320: Namespaces leak with constant lookup

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

[fxn (Xavier Noria)]

The following program

X = :top

class C
  X = :super
end

class D < C
  p X
end

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

[fxn (Xavier Noria)]

This is probably a consequence of https://bugs.ruby-lang.org/issues/21318.

[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