Issue #21760 has been updated by katsyoshi (Katsuyoshi MATSUMOTO). I found another `Ruby::Box#require` case that seems related to this issue. ### Environment - 4.0.1 / linux - `RUBY_BOX=1` If a file loaded inside `Ruby::Box` requires `fiddle/import`, loading the same file from multiple boxes can fail with: ```ruby LoadError: cannot load such file -- fiddle/import ``` ### Reproducer ```ruby import.rb require "fiddle/import" ``` ```ruby sample.rb abox = Ruby::Box.new bbox = Ruby::Box.new abox.require "./import.rb" bbox.require "./import.rb" ``` Interestingly, requiring time from multiple boxes works in the same environment, so this may be specific to fiddle/import, or more generally to ext/stdlib loading through Ruby::Box. The current box documentation seems to suggest that dependencies required from a file loaded via Ruby::Box should also be loaded recursively within that box, so this looked like another require-related inconsistency to me. If this is expected behavior, it may need to be documented as a limitation. Otherwise, this may belong in the same family of Ruby::Box#require bugs tracked here. ---------------------------------------- Bug #21760: Ruby::Box: a couple of require-related problems https://bugs.ruby-lang.org/issues/21760#change-116638 * Author: zverok (Victor Shepelev) * Status: Assigned * Assignee: tagomoris (Satoshi Tagomori) * ruby -v: 4.0.0dev (2025-12-03T05:16:03Z master 4762f429f4) +PRISM [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- I am not sure whether all the problems have the same nature, but putting them together for now. **1. Enabling box breaks `gem`+`require`** Minimal reproducible example: `test.rb`: ```ruby gem 'faraday', '= 2.14.0' require 'faraday' p Faraday::VERSION ``` (Note that there is no explicit use of `Ruby::Box`) Running it with and without `RUBY_BOX`: ```sh $ ruby test.rb "2.14.0" $ RUBY_BOX=1 ruby test.rb ruby: warning: Ruby::Box is experimental, and the behavior may change in the future! See doc/box.md for known issues, etc. test.rb:2:in 'Kernel#require': cannot load such file -- faraday (LoadError) from test.rb:2:in 'Ruby::Box::Loader#require' from test.rb:2:in '<main>' test.rb:2:in 'Kernel#require': cannot load such file -- faraday (LoadError) from test.rb:2:in 'Ruby::Box::Loader#require' from test.rb:2:in '<main>' ``` (sic, the error is printed twice) **2. requiring the same gem from `Box`-loaded file and the main file** `box.rb`: ```ruby require 'faraday' p "In a box: #{Faraday::VERSION}" ``` `main.rb` ```ruby b = Ruby::Box.new b.load('box.rb') require 'faraday' ``` ```sh $ RUBY_BOX=1 ruby main.rb ruby: warning: Ruby::Box is experimental, and the behavior may change in the future! See doc/box.md for known issues, etc. "In a box: 2.14.0" main.rb:5:in 'Kernel#require': cannot load such file -- faraday (LoadError) from main.rb:5:in 'Ruby::Box::Loader#require' from main.rb:5:in '<main>' main.rb:5:in 'Kernel#require': cannot load such file -- faraday (LoadError) from main.rb:5:in 'Ruby::Box::Loader#require' from main.rb:5:in '<main>' ``` **3. `Box#require` seem to not be aware of gems** In the example above, we see that Box-loaded file can require a gem. This also works: ```ruby b = Ruby::Box.new b.eval(<<~RUBY) require "faraday" p Faraday::VERSION RUBY ``` (prints "2.14.0" as expected) But this doesn't: ```ruby b = Ruby::Box.new b.require('faraday') ``` ```sh $ RUBY_BOX=1 ruby test.rb ruby: warning: Ruby::Box is experimental, and the behavior may change in the future! See doc/language/box.md for known issues, etc. test.rb:3:in 'Ruby::Box#require': cannot load such file -- faraday (LoadError) from test.rb:3:in '<main>' ``` -- https://bugs.ruby-lang.org/