Lint/UselessAssignment: crash on splatted nested parallel assignment #14193
Description
Splatted, nested parallel assignment (left, right), *rest = [[:foo, 1], [:bar, 2]] makes the Lint/UselessAssignment cop crash.
(Possibly a variant of #11905)
Expected behavior
RuboCop should finish without crashing.
Actual behavior
BackTrace
RUBOCOP_TARGET_RUBY_VERSION=3.3 rubocop example.rb --debug
For /tmp/rubocop-variableforce-error: Default configuration from /home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/config/default.yml
Use parallel by default.
Skipping parallel inspection: only a single file needs inspection
Inspecting 1 file
Scanning /tmp/rubocop-variableforce-error/example.rb
An error occurred while Lint/UselessAssignment cop was inspecting /tmp/rubocop-variableforce-error/example.rb.
undefined method `source' for nil
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/lint/useless_assignment.rb:209:in `remove_local_variable_assignment_part'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/lint/useless_assignment.rb:179:in `autocorrect'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/lint/useless_assignment.rb:74:in `block (2 levels) in check_for_unused_assignments'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/base.rb:426:in `correct'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/base.rb:210:in `add_offense'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/lint/useless_assignment.rb:66:in `block in check_for_unused_assignments'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/lint/useless_assignment.rb:59:in `reverse_each'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/lint/useless_assignment.rb:59:in `check_for_unused_assignments'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/lint/useless_assignment.rb:52:in `block in after_leaving_scope'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/lint/useless_assignment.rb:52:in `each_value'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/lint/useless_assignment.rb:52:in `after_leaving_scope'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/force.rb:44:in `public_send'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/force.rb:44:in `block in run_hook'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/force.rb:41:in `each'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/force.rb:41:in `run_hook'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/variable_force.rb:376:in `block (2 levels) in <class:VariableForce>'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/variable_force/variable_table.rb:17:in `invoke_hook'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/variable_force/variable_table.rb:36:in `pop_scope'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/variable_force.rb:85:in `investigate'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/commissioner.rb:164:in `block (2 levels) in invoke_with_argument'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/commissioner.rb:171:in `with_cop_error_handling'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/commissioner.rb:164:in `block in invoke_with_argument'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/commissioner.rb:164:in `each'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/commissioner.rb:164:in `invoke_with_argument'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/commissioner.rb:85:in `investigate'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/team.rb:174:in `investigate_partial'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cop/team.rb:108:in `investigate'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:348:in `block in inspect_file'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:347:in `each'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:347:in `flat_map'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:347:in `inspect_file'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:290:in `block in do_inspection_loop'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:324:in `block in iterate_until_no_changes'
<internal:kernel>:187:in `loop'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:317:in `iterate_until_no_changes'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:286:in `do_inspection_loop'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:167:in `block in file_offenses'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:192:in `file_offense_cache'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:166:in `file_offenses'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:154:in `process_file'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:135:in `block in each_inspected_file'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:134:in `each'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:134:in `reduce'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:134:in `each_inspected_file'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:120:in `inspect_files'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/runner.rb:73:in `run'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli/command/execute_runner.rb:26:in `block in execute_runner'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli/command/execute_runner.rb:52:in `with_redirect'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli/command/execute_runner.rb:25:in `execute_runner'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli/command/execute_runner.rb:17:in `run'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli/command.rb:11:in `run'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli/environment.rb:18:in `run'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli.rb:122:in `run_command'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli.rb:129:in `execute_runners'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli.rb:51:in `block in run'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli.rb:81:in `profile_if_needed'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/lib/rubocop/cli.rb:43:in `run'
/home/s/.asdf/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/rubocop-1.75.6/exe/rubocop:19:in `<top (required)>'
/home/s/.asdf/installs/ruby/3.3.6/bin/rubocop:25:in `load'
/home/s/.asdf/installs/ruby/3.3.6/bin/rubocop:25:in `<main>'
.
1 file inspected, no offenses detected
1 error occurred:
An error occurred while Lint/UselessAssignment cop was inspecting /tmp/rubocop-variableforce-error/example.rb.Steps to reproduce the problem
Create a file named example.rb containing:
# frozen_string_literal: true
(left, right), *rest = [[:foo, 1], [:bar, 2]]Run RuboCop:
RUBOCOP_TARGET_RUBY_VERSION=3.3 rubocop example.rb --debugRuboCop version
rubocop -V
1.75.6 (using Parser 3.3.8.0, rubocop-ast 1.44.1, analyzing as Ruby 2.7, running on ruby 3.3.6) [x86_64-linux]