bundle exec: superclass mismatch for class Command (TypeError)

[doits]

Describe the problem as clearly as you can

I cannot run "bundle exec" within ruby anymore. It give as superclass mismatch for class Command (TypeError) error.

To reproduce:

touch Gemfile

ruby -e 'require "bundler/setup"; `bundle exec abc`'

/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/command.rb:2:in '<class:Thor>': superclass mismatch for class Command (TypeError)
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/command.rb:1:in '<top (required)>'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/base.rb:1:in 'Kernel#require_relative'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/base.rb:1:in '<top (required)>'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor.rb:1:in 'Kernel#require_relative'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor.rb:1:in '<top (required)>'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendored_thor.rb:8:in 'Kernel#require_relative'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendored_thor.rb:8:in '<top (required)>'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/friendly_errors.rb:3:in 'Kernel#require_relative'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/friendly_errors.rb:3:in '<top (required)>'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/bundled_gems.rb:82:in 'Kernel.require'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/bundled_gems.rb:82:in 'block (2 levels) in Kernel#replace_require'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/exe/bundle:18:in '<top (required)>'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems.rb:303:in 'Kernel#load'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems.rb:303:in 'Gem.activate_and_load_bin_path'
        from /Users/user/.local/share/mise/installs/ruby/3.4.7/bin/bundle:25:in '<main>'

Did you try upgrading rubygems & bundler?

Yes

If not included with the output of your command, run bundle env and paste the output below

Bundler       4.0.0
  Platforms   ruby, arm64-darwin-25
Ruby          3.4.7p58 (2025-10-08 revision 7a5688e2a27668e48f8d6ff4af5b2208b98a2f5e) [arm64-darwin-25]
  Full Path   /Users/user/.local/share/mise/installs/ruby/3.4.7/bin/ruby
  Config Dir  /Users/user/.local/share/mise/installs/ruby/3.4.7/etc
RubyGems      4.0.0
  Gem Home    /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0
  Gem Path    /Users/user/.gem/ruby/3.4.0:/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0
  User Home   /Users/user
  User Path   /Users/user/.gem/ruby/3.4.0
  Bin Dir     /Users/user/.local/share/mise/installs/ruby/3.4.7/bin
Tools
  Git         2.52.0
  RVM         not installed
  rbenv       rbenv 1.3.2
  chruby      not installed

Bundler Build Metadata

Timestamp  2025-12-03
Git SHA    64d0dfe695

Bundler settings

build.mysql2
  Set for your local app (/Users/user/.bundle/config): "--with-mysql-lib=/opt/homebrew/opt/mysql-client/lib --with-mysql-dir=/opt/homebrew/opt/mysql-client --with-mysql-config=/opt/homebrew/opt/mysql-client/bin/mysql_config \\ --with-mysql-include=/opt/homebrew/opt/mysql-client/include --with-ldflags=-L/opt/homebrew/opt/zlib/lib"
  Set for the current user (/Users/user/.bundle/config): "--with-mysql-lib=/opt/homebrew/opt/mysql-client/lib --with-mysql-dir=/opt/homebrew/opt/mysql-client --with-mysql-config=/opt/homebrew/opt/mysql-client/bin/mysql_config \\ --with-mysql-include=/opt/homebrew/opt/mysql-client/include --with-ldflags=-L/opt/homebrew/opt/zlib/lib"
build.pg
  Set for your local app (/Users/user/.bundle/config): "--with-pg-config=/opt/homebrew/opt/libpq/bin/pg_config"
  Set for the current user (/Users/user/.bundle/config): "--with-pg-config=/opt/homebrew/opt/libpq/bin/pg_config"
build.sqlite3
  Set for your local app (/Users/user/.bundle/config): "--with-sqlite3-lib=/opt/homebrew/opt/sqlite/lib"
  Set for the current user (/Users/user/.bundle/config): "--with-sqlite3-lib=/opt/homebrew/opt/sqlite/lib"

Gemfile

Gemfile

Gemfile.lock

GEM
  specs:

PLATFORMS
  arm64-darwin-25
  ruby

DEPENDENCIES

CHECKSUMS

BUNDLED WITH
  4.0.0

[kou]

Could you add the following debug prints to /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/command.rb and share the output?

puts $" # This
class Bundler::Thor
  p Command.ancestors # and this
  class Command < Struct.new(:name, ...)
    ...

[doits]

Thanks for your fast response and looking into it!

Here's the output, though I had to add a puts in front of my bundle exec, otherwise no output was shown (not exactly sure why).

Output

❯ ruby -e 'require "bundler/setup"; puts `bundle exec abc`'
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/command.rb:4:in '<class:Thor>': superclass mismatch for class Command (TypeError)
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/command.rb:2:in '<top (required)>'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/base.rb:1:in 'Kernel#require_relative'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/base.rb:1:in '<top (required)>'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor.rb:1:in 'Kernel#require_relative'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor.rb:1:in '<top (required)>'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendored_thor.rb:8:in 'Kernel#require_relative'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendored_thor.rb:8:in '<top (required)>'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/friendly_errors.rb:3:in 'Kernel#require_relative'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/friendly_errors.rb:3:in '<top (required)>'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/bundled_gems.rb:82:in 'Kernel.require'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/bundled_gems.rb:82:in 'block (2 levels) in Kernel#replace_require'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/exe/bundle:18:in '<top (required)>'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems.rb:303:in 'Kernel#load'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems.rb:303:in 'Gem.activate_and_load_bin_path'
	from /Users/user/.local/share/mise/installs/ruby/3.4.7/bin/bundle:25:in '<main>'
enumerator.so
thread.rb
fiber.so
rational.so
complex.so
ruby2_keywords.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/arm64-darwin25/enc/encdb.bundle
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/arm64-darwin25/enc/trans/transdb.bundle
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/arm64-darwin25/rbconfig.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/defaults.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/deprecate.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/errors.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/target_rbconfig.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/win_platform.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/unknown_command_spell_checker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/exceptions.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/basic_specification.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/stub_specification.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/platform.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/specification_record.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/util/list.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/version.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/requirement.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/specification.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/util.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/dependency.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/core_ext/kernel_gem.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/arm64-darwin25/monitor.bundle
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/monitor.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/version.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/rubygems_integration.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/text.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/source/git.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/source/installed.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/source/specific_file.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/source/local.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/source/lock.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/source/vendor.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/source.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/match_metadata.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/match_platform.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/force_platform.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/name_tuple.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/rubygems_ext.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/current_ruby.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/shared_helpers.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendored_fileutils.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/errors.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/environment_preserver.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/plugin/api.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/plugin.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/build_metadata.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/self_manager.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/settings.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/path_support.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/arm64-darwin25/pathname.bundle
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/pathname.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/yaml_serializer.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/source.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/source/path.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/source/git.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems/user_interaction.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/source/rubygems.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/lockfile_parser.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/ui.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/command.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/core_ext/hash_with_indifferent_access.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/error.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/invocation.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/nested_context.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/parser/argument.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/parser/arguments.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/parser/option.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/parser/options.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/parser.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/shell.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/line_editor/basic.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/line_editor/readline.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/line_editor.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/util.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/base.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendored_thor.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/ui/shell.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/shell/terminal.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/shell/column_printer.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/shell/table_printer.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/shell/wrapped_printer.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/shell/basic.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/thor/lib/thor/shell/color.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/ui/rg_proxy.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/feature_flag.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/worker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/definition.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/dependency.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/ruby_dsl.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/dsl.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/source_list.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/source/metadata.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/checksum.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/tsort/lib/tsort.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendored_tsort.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/spec_set.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/runtime.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/index.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/ruby_version.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/match_remote_metadata.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/remote_specification.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/lazy_specification.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/endpoint_specification.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/bundled_gems.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/setup.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/rubygems.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/error_highlight/version.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/error_highlight/base.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/error_highlight/formatter.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/error_highlight/core_ext.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/error_highlight.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/version.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/core_ext/name_error.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/levenshtein.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/jaro_winkler.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/spell_checker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/spell_checkers/name_error_checkers.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/spell_checkers/method_name_checker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/spell_checkers/key_error_checker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/spell_checkers/null_checker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/tree_spell_checker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/spell_checkers/require_path_checker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/spell_checkers/pattern_key_name_checker.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean/formatter.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/did_you_mean.rb
/Users/user/.local/share/mise/installs/ruby/3.4.7/lib/ruby/3.4.0/syntax_suggest/core_ext.rb
[Bundler::Thor::Command, #<Class:0x00000001012180c0>, Struct, Enumerable, Object, Kernel, BasicObject]

[doits]

One more note which I see I forgot to mention: I did a gem update --system and gem update which gave me bundler v4 when the problem started. On bundler v2.7.2 there was/is no error.

---

And I just noticed it works with bundle exec ruby:

❯ bundle exec ruby -e 'require "bundler/setup"; `bundle exec abc`'
bundler: command not found: abc
Install missing gem executables with `bundle install`

Note I removed the debug print statements here though, otherwise I got a uninitialized constant Bundler::Thor::Command (NameError) on p Command.ancestors (which I assume is correct in that case, because it shouldn't be defined already).

[kou]

Thanks.

Bundler in Ruby 3.4 and Bundler installed by gem are mixed...

[kou]

Ah, Bundler installed by gem update --system and Bundler installed by gem install are mixed...?

[doits]

Thanks for the information, it makes sense.

Is there something I did wrong on update? My gem list shows only one version:

❯ gem list | grep bundler
bundler (default: 4.0.0)

Is it because gem update --system does not install bundler v4 yet, so it must be fixed there? Or did I do something wrong with the update, or maybe mise does something wrong?

[doits]

Here's how you can reproduce it on a clean install:

# install new clean ruby
❯ mise install ruby@3.4.6 # using 3.4.6 because I have 3.4.7 already installed
# Wait for install ...

# Create empty Gemfile
❯ touch Gemfile

# Try it
❯ mise exec ruby@3.4.6 -- ruby -e 'require "bundler/setup"; `bundle exec abc`'
# all good, output:
# bundler: command not found: abc
# Install missing gem executables with `bundle install`

# update system gems
❯ mise exec ruby@3.4.6 -- gem update --system
# Fetching rubygems-update-4.0.0.gem
# Successfully installed rubygems-update-4.0.0
# Installing RubyGems 4.0.0
#   Successfully built RubyGem
#   Name: bundler
#   Version: 4.0.0
#   File: bundler-4.0.0.gem
# [...]

# try again
❯ mise exec ruby@3.4.6 -- ruby -e 'require "bundler/setup"; `bundle exec abc`'
# Error happens!
# /Users/user/.local/share/mise/installs/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/command.rb:2:in '<class:Thor>': superclass mismatch for class Command (TypeError)
# [...]

# maybe a gem update helps?
❯ mise exec ruby@3.4.6 -- gem update
# [...]

# try again
❯ mise exec ruby@3.4.6 -- ruby -e 'require "bundler/setup"; `bundle exec abc`'
# Nope, error still there:
# /Users/user/.local/share/mise/installs/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/command.rb:2:in '<class:Thor>': superclass mismatch for class Command (TypeError)
# [...]

[doits]

Oh, I think a gem install bundler fixes it:

❯ mise exec ruby@3.4.6 -- gem install bundler
# Successfully installed bundler-4.0.0
# 1 gem installed

❯ mise exec ruby@3.4.6 -- ruby -e 'require "bundler/setup"; `bundle exec abc`'
# bundler: command not found: abc
# Install missing gem executables with `bundle install`

It's a little bit confusing though why this is needed 🤔

[rmm5t]

I just ran into the same problem. gem update --system broke it, and a subsequent gem install bundler remedied it, but that doesn't seem like it should be necessary.

i.e. When bundler is installed as a default gem, the problem exists, but not if it's installed as an explicit gem.

[kou]

I could reproduce this with ruby:3.4 Docker image:

$ docker run -it --rm ruby:3.4 bash
# touch Gemfile
# gem update --system
# ruby -e 'require "bundler/setup"; `bundle exec abc`'
/usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/command.rb:2:in '<class:Thor>': superclass mismatch for class Command (TypeError)
	from /usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/command.rb:1:in '<top (required)>'
	from /usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/base.rb:1:in 'Kernel#require_relative'
	from /usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/base.rb:1:in '<top (required)>'
	from /usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor.rb:1:in 'Kernel#require_relative'
	from /usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor.rb:1:in '<top (required)>'
	from /usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendored_thor.rb:8:in 'Kernel#require_relative'
	from /usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendored_thor.rb:8:in '<top (required)>'
	from /usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/friendly_errors.rb:3:in 'Kernel#require_relative'
	from /usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/friendly_errors.rb:3:in '<top (required)>'
	from /usr/local/lib/ruby/3.4.0/bundled_gems.rb:82:in 'Kernel.require'
	from /usr/local/lib/ruby/3.4.0/bundled_gems.rb:82:in 'block (2 levels) in Kernel#replace_require'
	from /usr/local/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/exe/bundle:18:in '<top (required)>'
	from /usr/local/lib/ruby/site_ruby/3.4.0/rubygems.rb:303:in 'Kernel#load'
	from /usr/local/lib/ruby/site_ruby/3.4.0/rubygems.rb:303:in 'Gem.activate_and_load_bin_path'
	from /usr/local/bin/bundle:25:in '<main>'

[hsbt]

This may be fixed at #9167.

I could also reproduce this at my environment with broken installation.

❯ ruby -e 'require "bundler/setup"; `bundle exec abc`'
/Users/hsbt/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendored_thor.rb:4: warning: method redefined; discarding old require_thor_actions
/Users/hsbt/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendored_thor.rb:4: warning: previous definition of require_thor_actions was here
/Users/hsbt/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/thor/lib/thor/command.rb:2:in '<class:Thor>': superclass mismatch for class Command (TypeError)

Run update_rubygems with #9167 resolved this report.

❯ ruby -e 'require "bundler/setup"; `bundle exec abc`'
bundler: command not found: abc
Install missing gem executables with `bundle install`