Existence of this gem causes LoadError on Bundler.require of unrelated project

[scivola]

Describe the problem as clearly as you can

If rubygems-generate_index gem is installed, LoadError occurs when Bundler.require.

Did you try upgrading RubyGems?

% ruby -v
ruby 3.3.6 (2024-11-05 revision 75015d4c1f) [arm64-darwin24]
% gem -v
3.6.1
% bundle -v
Bundler version 2.6.1

Post steps to reproduce the problem

Here are minimal reproduction codes.

Gemfile:

source "https://rubygems.org"

sample.rb:

require "bundler/setup"
Bundler.require

Then:

% ruby sample.rb

It is no problem!

But we install rubygems-generate_index gem:

% gem install rubygems-generate_index 

And then:

% ruby sample.rb  
Error loading RubyGems plugin "/Users/XXXXX/.rbenv/versions/3.3.6/lib/ruby/gems/3.3.0/plugins/rubygems-generate_index_plugin.rb": cannot load such file -- compact_index (LoadError)

Run gem env and paste the output below

RubyGems Environment:
  - RUBYGEMS VERSION: 3.6.1
  - RUBY VERSION: 3.3.6 (2024-11-05 patchlevel 108) [arm64-darwin24]
  - INSTALLATION DIRECTORY: /Users/XXXXX/.rbenv/versions/3.3.6/lib/ruby/gems/3.3.0
  - USER INSTALLATION DIRECTORY: /Users/XXXXX/.local/share/gem/ruby/3.3.0
  - RUBY EXECUTABLE: /Users/XXXXX/.rbenv/versions/3.3.6/bin/ruby
  - GIT EXECUTABLE: /usr/bin/git
  - EXECUTABLE DIRECTORY: /Users/XXXXX/.rbenv/versions/3.3.6/bin
  - SPEC CACHE DIRECTORY: /Users/XXXXX/.cache/gem/specs
  - SYSTEM CONFIGURATION DIRECTORY: /Users/XXXXX/.rbenv/versions/3.3.6/etc
  - RUBYGEMS PLATFORMS:
     - ruby
     - arm64-darwin-24
  - GEM PATHS:
     - /Users/XXXXX/.rbenv/versions/3.3.6/lib/ruby/gems/3.3.0
     - /Users/XXXXX/.local/share/gem/ruby/3.3.0
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => true
     - :bulk_threshold => 1000
     - "install" => "--no-document"
     - "update" => "--no-document"
  - REMOTE SOURCES:
     - https://rubygems.org/
  - SHELL PATH:
     - /Users/XXXXX/.rbenv/versions/3.3.6/bin
     - /opt/homebrew/Cellar/rbenv/1.3.0/libexec
     - /Users/XXXXX/.rbenv/shims
     - /Users/XXXXX/bin
     - /opt/homebrew/bin
     - /opt/homebrew/sbin
     - /usr/local/bin
     - /System/Cryptexes/App/usr/bin
     - /usr/bin
     - /bin
     - /usr/sbin
     - /sbin
     - /var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin
     - /var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin
     - /var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin
     - /Users/XXXXX/.rbenv/shims
     - /Users/XXXXX/bin
     - /Users/XXXXX/.cargo/bin

Note

If we change the line

require "bundler/setup"

to

require "bundler"

LoadError does not occur.

And if we uninstall rubygems-generate_index gem, LoadError does not occur.