From: "unasuke (Yusuke Nakamura) via ruby-core" <ruby-core@...>
Date: 2026-08-23T05:55:47+00:00
Subject: [ruby-core:126471] [Ruby Bug#21798] `bundle install` command fails if touches `$LOAD_PATH` on `Ruby::Box` enabled

Issue #21798 has been updated by unasuke (Yusuke Nakamura).


This is no longer reproducible since Ruby 4.0.6, so I'm closing this.

Bisecting on ruby_4_0 shows it was fixed by [99aac00fa1](https://github.com/ruby/ruby/commit/99aac00fa13c03f71d3a4d89686e447f2950df68).

Fixed by #21881.

----------------------------------------
Bug #21798: `bundle install` command fails if touches `$LOAD_PATH` on `Ruby::Box` enabled
https://bugs.ruby-lang.org/issues/21798#change-118626

* Author: unasuke (Yusuke Nakamura)
* Status: Assigned
* Assignee: tagomoris (Satoshi Tagomori)
* ruby -v: 4.0.0-preview3
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
## How to reproduce

```dockerfile
FROM ruby:4.0.0-preview3-trixie

WORKDIR /ruby_box_test

RUN bundle gem foo --test=minitest
WORKDIR /ruby_box_test/foo

RUN head -n 10 foo.gemspec

# PASS
RUN bundle install

# PASS
RUN RUBY_BOX=1 bundle install

RUN sed --in-place \
  --expression='2i lib=File.expand_path("../lib", __FILE__)\n$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)' \
  foo.gemspec
RUN sed --in-place \
  --expression='s/require_relative "lib\/foo\/version"/require "foo\/version"/' \
  foo.gemspec
RUN head -n 10 foo.gemspec

# PASS
RUN bundle install

# FAIL
RUN RUBY_BOX=1 bundle install
```

This script fails.

```
/usr/local/bin/ruby: warning: Ruby::Box is experimental, and the behavior may change in the future!
See doc/language/box.md for known issues, etc.

[!] There was an error while loading `foo.gemspec`: cannot load such file -- foo/version. Bundler cannot continue.

 #  from /ruby_box_test/foo/foo.gemspec:5
 #  -------------------------------------------
 #  
 >  require "foo/version"
 #  
 #  -------------------------------------------
Error: building at STEP "RUN RUBY_BOX=1 bundle install": while running runtime: exit status 14
```

Head of the gemspec file is this.

```ruby
# frozen_string_literal: true
lib=File.expand_path("../lib", __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require "foo/version"

Gem::Specification.new do |spec|
  # ..snip..
end
```

# misc
I found this behavior when `RUBY_BOX=1 bundle exec rake spec` on `https://github.com/itamae-kitchen/itamae`.



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