Ruby

Bug #21324

Updated by Eregon (Benoit Daloze) about 14 hours ago

RubyGems has tons of mutable state, isn't core library and isn't "builtin classes" either, so it should not be in root Namespace, but as it is currently: 
 ``` 
 $ RUBY_NAMESPACE=1 ruby -ve 'ns = Namespace.new; p ns::Gem.equal?(Gem)' 
 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. 
 true 
 ``` 

 A concrete example of what breaks most likely due to this: 
 ``` 
 $ gem i delegate:0.3.1 
 $ RUBY_NAMESPACE=1 ruby -ve 'require "delegate"; p Delegator::VERSION; ns = Namespace.new; File.write "ns.rb", "gem %{delegate}, %{0.3.1}; require :delegate.to_s; p Delegator::VERSION"; 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. 
 "0.4.0" 
 /home/eregon/prefix/ruby-master/lib/ruby/3.5.0+0/rubygems/specification.rb:2232:in 'Gem::Specification#check_version_conflict': can't activate delegate-0.3.1, already activated delegate-0.4.0 (Gem::LoadError) 
	 from /home/eregon/prefix/ruby-master/lib/ruby/3.5.0+0/rubygems/specification.rb:1383:in 'Gem::Specification#activate' 
	 from /home/eregon/prefix/ruby-master/lib/ruby/3.5.0+0/rubygems/core_ext/kernel_gem.rb:62:in 'block in Kernel#gem' 
	 from /home/eregon/prefix/ruby-master/lib/ruby/3.5.0+0/rubygems/core_ext/kernel_gem.rb:62:in 'Thread::Mutex#synchronize' 
	 from /home/eregon/prefix/ruby-master/lib/ruby/3.5.0+0/rubygems/core_ext/kernel_gem.rb:62:in 'Kernel#gem' 
	 from /home/eregon/ns.rb:1:in '<top (required)>' 
	 from -e:1:in 'Namespace#require' 
	 from -e:1:in '<main>' 
 ``` 
 i.e. `ns` sees delegate-0.4.0 was loaded in main namespace but it shouldn't. 

 Previously mentioned in https://bugs.ruby-lang.org/issues/21311#note-36

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