Style/InPatternThen crashes

[akimd]

On the following snippet that cop crashes.

$ cat rubocop.rb
def fun1(obj)
  case obj
  in Hash;  1
  in Integer | Symbol | true | nil; 0
  end
end

---

Expected behavior

Not a crash.

Actual behavior

$ bundle exec rubocop -d --only Style/InPatternThen rubocop.rb
For /Users/akim/src/faveod/langeod: configuration from .rubocop.yml
Default configuration from vendor/ruby/3.3.0/gems/rubocop-1.65.1/config/default.yml
Use parallel by default.
Skipping parallel inspection: only a single file needs inspection
Inspecting 1 file
Scanning rubocop.rb
An error occurred while Style/InPatternThen cop was inspecting rubocop.rb:4:2.
undefined method `join' for an instance of String
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/style/in_pattern_then.rb:51:in `alternative_pattern_source'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/style/in_pattern_then.rb:34:in `on_in_pattern'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/commissioner.rb:107:in `public_send'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/commissioner.rb:107:in `block (2 levels) in trigger_responding_cops'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/commissioner.rb:171:in `with_cop_error_handling'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/commissioner.rb:106:in `block in trigger_responding_cops'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/commissioner.rb:105:in `each'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/commissioner.rb:105:in `trigger_responding_cops'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/commissioner.rb:69:in `on_in_pattern'
vendor/ruby/3.3.0/gems/rubocop-ast-1.32.0/lib/rubocop/ast/traversal.rb:140:in `block in on_case'
vendor/ruby/3.3.0/gems/rubocop-ast-1.32.0/lib/rubocop/ast/traversal.rb:140:in `each'
vendor/ruby/3.3.0/gems/rubocop-ast-1.32.0/lib/rubocop/ast/traversal.rb:140:in `on_case'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/commissioner.rb:71:in `on_case_match'
vendor/ruby/3.3.0/gems/rubocop-ast-1.32.0/lib/rubocop/ast/traversal.rb:154:in `on_def'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/commissioner.rb:71:in `on_def'
vendor/ruby/3.3.0/gems/rubocop-ast-1.32.0/lib/rubocop/ast/traversal.rb:20:in `walk'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/commissioner.rb:87:in `investigate'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/team.rb:164:in `investigate_partial'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cop/team.rb:102:in `investigate'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:349:in `block in inspect_file'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:348:in `each'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:348:in `flat_map'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:348:in `inspect_file'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:291:in `block in do_inspection_loop'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:325:in `block in iterate_until_no_changes'
<internal:kernel>:187:in `loop'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:318:in `iterate_until_no_changes'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:287:in `do_inspection_loop'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:168:in `block in file_offenses'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:193:in `file_offense_cache'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:167:in `file_offenses'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:158:in `process_file'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:139:in `block in each_inspected_file'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:138:in `each'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:138:in `reduce'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:138:in `each_inspected_file'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:124:in `inspect_files'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/runner.rb:77:in `run'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli/command/execute_runner.rb:26:in `block in execute_runner'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli/command/execute_runner.rb:52:in `with_redirect'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli/command/execute_runner.rb:25:in `execute_runner'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli/command/execute_runner.rb:17:in `run'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli/command.rb:11:in `run'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli/environment.rb:18:in `run'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli.rb:122:in `run_command'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli.rb:129:in `execute_runners'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli.rb:51:in `block in run'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli.rb:81:in `profile_if_needed'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/lib/rubocop/cli.rb:43:in `run'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/exe/rubocop:19:in `block in <top (required)>'
/opt/local/lib/ruby3.3/3.3.0/benchmark.rb:313:in `realtime'
vendor/ruby/3.3.0/gems/rubocop-1.65.1/exe/rubocop:19:in `<top (required)>'
vendor/ruby/3.3.0/bin/rubocop:25:in `load'
vendor/ruby/3.3.0/bin/rubocop:25:in `<main>'
C

Offenses:

rubocop.rb:3:10: C: [Correctable] Style/InPatternThen: Do not use in Hash;. Use in Hash then instead.
  in Hash;  1
         ^

1 file inspected, 1 offense detected, 1 offense autocorrectable

1 error occurred:
An error occurred while Style/InPatternThen cop was inspecting rubocop.rb:4:2.
configuration from .rubocop.yml
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
https://github.com/rubocop/rubocop/issues

Mention the following information in the issue report:
1.65.1 (using Parser 3.3.4.2, rubocop-ast 1.32.0, running on ruby 3.3.4) [arm64-darwin23]
Finished in 0.08607299998402596 seconds

Steps to reproduce the problem

See above.

RuboCop version

$ bundle exec rubocop -V
1.65.1 (using Parser 3.3.4.2, rubocop-ast 1.32.0, running on ruby 3.3.4) [arm64-darwin23]

Cheers!

[akimd]

Thanks!