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. -- https://bugs.ruby-lang.org/