Issue #21855 has been updated by larskanis (Lars Kanis). Thanks for merging! There is a second bug, that is fixed by making win32-registry a bundled gem: The gemspec of the default gem looks like so: ```ruby $ cat c:\Ruby40-arm\lib\ruby\gems\4.0.0\specifications\default\win32-registry-0.1.2.gemspec # -*- encoding: utf-8 -*- # stub: win32-registry 0.1.2 ruby lib Gem::Specification.new do |s| s.name = "win32-registry".freeze s.version = "0.1.2".freeze s.required_rubygems_version = Gem::Requirement.new(">= 0".freeze) if s.respond_to? :required_rubygems_version= s.metadata = { "homepage_uri" => "https://github.com/ruby/win32-registry", "source_code_uri" => "https://github.com/ruby/win32-registry" } if s.respond_to? :metadata= s.require_paths = ["lib".freeze] s.authors = ["U.Nakamura".freeze] s.bindir = "exe".freeze s.date = "2026-01-13" s.description = "Provides an interface to the Windows Registry in Ruby".freeze s.email = ["usa@garbagecollect.jp".freeze] s.files = ["lib/win32/registry.rb".freeze, "lib/win32/resolv.rb".freeze] s.homepage = "https://github.com/ruby/win32-registry".freeze s.required_ruby_version = Gem::Requirement.new(">= 2.6.0".freeze) s.rubygems_version = "4.0.3".freeze s.summary = "Provides an interface to the Windows Registry in Ruby".freeze s.specification_version = 4 s.add_runtime_dependency(%q<fiddle>.freeze, ["~> 1.0".freeze]) end ``` The problem is, it contains a foreign file `win32/revolv.rb`: ``` s.files = ["lib/win32/registry.rb".freeze, "lib/win32/resolv.rb".freeze] ``` That leads to fetching the gemspec of win32-registry, although win32/resolv is required and although win32/resolv is independent from win32-registry since ruby-4.0. That leads to failures like here: * https://github.com/ruby/rubygems/issues/9277#issue-3869290287 and * https://github.com/ruby/rubygems/pull/9235/changes/e85c31f02a75ffeac73b4d491... So is could this commit be backported to ruby-4.0.x? If no: Do you think there are issues if I backport it specifically for RubyInstaller-4.0.2+? ---------------------------------------- Bug #21855: Bundle `win32-registry` or implement it without `fiddle` https://bugs.ruby-lang.org/issues/21855#change-116511 * Author: Earlopain (Earlopain _) * Status: Closed * Assignee: hsbt (Hiroshi SHIBATA) * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- `win32-registry` (a default gem), is currently implemented via `fiddle` (a bundled gem). This makes it impossible to use under bundler without adding `fiddle` to the gemfile. In the past it has lead to issues like https://bugs.ruby-lang.org/issues/21645. It was solved by simply not using `win32-registry` anymore in `resolv` and implementing it via C (https://github.com/ruby/resolv/pull/110), although the overarching issue is still present. There is also a report for this for rubygems https://github.com/ruby/rubygems/issues/9277. This should be solved by updating the vendored `resolv` version I think. Still, the dependecy relation between `win32-registry` and `fiddle` is pretty incompatible. A default gem can't depend on a bundled gem without breaking dependency resolution. To solve this it would have to be implemented without using `fiddle`, similar to how `resolv` did it. But now that `resolv` doesn't use `win32-registry`, I don't think anything in ruby uses it anymore. So moving it to a bundled gem could also be a solution without rewriting the whole thing. Here is an issue about this in the `win32-registry` repo: https://github.com/ruby/win32-registry/issues/11 -- https://bugs.ruby-lang.org/