Issue #21339 has been updated by mame (Yusuke Endoh). It works as expected with `--disable=gems`. ``` $ RUBY_NAMESPACE=1 ./local/bin/ruby --disable=gems test.rb ./local/bin/ruby: warning: Namespace is experimental, and the behavior may change in the future! See doc/namespace.md for known issues, etc. main: [:load_iseq, "/tmp/test-file.rb"] namespace: [:load_iseq, "/tmp/test-file.rb"] ``` But it does not by default. ``` $ RUBY_NAMESPACE=1 ./local/bin/ruby test.rb ./local/bin/ruby: warning: Namespace is experimental, and the behavior may change in the future! See doc/namespace.md for known issues, etc. main: namespace: [:load_iseq, "/tmp/test-file.rb"] ``` The reason seems to be that rubygems's require monkey patch does not work in sub namespace. ```ruby # with RUBY_NAMESPACE=1 puts "main:" require "csv" #=> OK if ENV["RUBY_NAMESPACE"] puts "namespace:" ns = Namespace.new # csv is a bundled gem, so rubygems is needed to require it ns.require("csv") #=> cannot load such file -- csv (LoadError) end ``` Thus, there are two problems * load_iseq does not fire via RubyGems require monkey patch. * RubyGems require monkey patch does not work in sub namespaces. ---------------------------------------- Bug #21339: Namespace: `RubyVM::InstructionSequence.load_iseq` isn't called for the root namespace https://bugs.ruby-lang.org/issues/21339#change-113265 * Author: byroot (Jean Boussier) * Status: Assigned * Assignee: tagomoris (Satoshi Tagomori) * ruby -v: ruby 3.5.0dev (2025-05-14T12:41:46Z master b5575a80bc) +PRISM [arm64-darwin24] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ```ruby File.write("/tmp/compile-cache.rb", <<~'RUBY') class << RubyVM::InstructionSequence def load_iseq(path) p [:load_iseq, path] RubyVM::InstructionSequence.compile_file(path) end end RUBY File.write("/tmp/test-file.rb", "") puts "main:" require "/tmp/compile-cache.rb" require "/tmp/test-file.rb" if ENV["RUBY_NAMESPACE"] puts "namespace:" ns = Namespace.new ns.require("/tmp/compile-cache.rb") ns.require("/tmp/test-file.rb") end ``` Expected behavior: I would expect `load_iseq` to be invoked both in the root namespace and the user namespace when `RUBY_NAMESPACE=1`. Actual behavior: Somehow it's only invoked in the user namespace: ```bash main: [:compile_cache_setup] [:load_iseq, "/tmp/test-file.rb"] ``` ```bash main: [:compile_cache_setup] namespace: [:compile_cache_setup] [:load_iseq, "/tmp/test-file.rb"] ``` But I don't understand why. -- https://bugs.ruby-lang.org/