Lint/Void errors with CheckForMethodsWithNoSideEffects: true

[tsugimoto]

Lint/Void errors a lot if CheckForMethodsWithNoSideEffects configuration is set to true.

---

Expected behavior

RuboCop does not error.

Actual behavior

$ rubocop -d --only Lint/Void main1.rb 
For ...: configuration from .../.rubocop.yml
Default configuration from .../rubocop-1.44.0/config/default.yml
Use parallel by default.
Skipping parallel inspection: only a single file needs inspection
Inspecting 1 file
Scanning .../main1.rb
An error occurred while Lint/Void cop was inspecting .../main1.rb:3:0.
undefined method `method_name' for s(:lvasgn, :foo,
  s(:send, nil, :bar)):RuboCop::AST::AsgnNode

          method_name = node.method_name
                            ^^^^^^^^^^^^
Did you mean?  method
.../rubocop-1.44.0/lib/rubocop/cop/lint/void.rb:131:in `check_nonmutating'
.../rubocop-1.44.0/lib/rubocop/cop/lint/void.rb:97:in `check_expression'
.../rubocop-1.44.0/lib/rubocop/cop/lint/void.rb:86:in `block in check_begin'
.../rubocop-1.44.0/lib/rubocop/cop/lint/void.rb:86:in `each'
.../rubocop-1.44.0/lib/rubocop/cop/lint/void.rb:86:in `check_begin'
.../rubocop-1.44.0/lib/rubocop/cop/lint/void.rb:77:in `on_begin'
.../rubocop-1.44.0/lib/rubocop/cop/commissioner.rb:101:in `public_send'
.../rubocop-1.44.0/lib/rubocop/cop/commissioner.rb:101:in `block (2 levels) in trigger_responding_cops'
.../rubocop-1.44.0/lib/rubocop/cop/commissioner.rb:165:in `with_cop_error_handling'
.../rubocop-1.44.0/lib/rubocop/cop/commissioner.rb:100:in `block in trigger_responding_cops'
.../rubocop-1.44.0/lib/rubocop/cop/commissioner.rb:99:in `each'
.../rubocop-1.44.0/lib/rubocop/cop/commissioner.rb:99:in `trigger_responding_cops'
.../rubocop-1.44.0/lib/rubocop/cop/commissioner.rb:69:in `on_begin'
.../rubocop-ast-1.24.1/lib/rubocop/ast/traversal.rb:20:in `walk'
.../rubocop-1.44.0/lib/rubocop/cop/commissioner.rb:87:in `investigate'
.../rubocop-1.44.0/lib/rubocop/cop/team.rb:154:in `investigate_partial'
.../rubocop-1.44.0/lib/rubocop/cop/team.rb:97:in `investigate'
.../rubocop-1.44.0/lib/rubocop/runner.rb:322:in `inspect_file'
.../rubocop-1.44.0/lib/rubocop/runner.rb:266:in `block in do_inspection_loop'
.../rubocop-1.44.0/lib/rubocop/runner.rb:300:in `block in iterate_until_no_changes'
.../rubocop-1.44.0/lib/rubocop/runner.rb:293:in `loop'
.../rubocop-1.44.0/lib/rubocop/runner.rb:293:in `iterate_until_no_changes'
.../rubocop-1.44.0/lib/rubocop/runner.rb:262:in `do_inspection_loop'
.../rubocop-1.44.0/lib/rubocop/runner.rb:143:in `block in file_offenses'
.../rubocop-1.44.0/lib/rubocop/runner.rb:168:in `file_offense_cache'
.../rubocop-1.44.0/lib/rubocop/runner.rb:142:in `file_offenses'
.../rubocop-1.44.0/lib/rubocop/runner.rb:133:in `process_file'
.../rubocop-1.44.0/lib/rubocop/runner.rb:114:in `block in each_inspected_file'
.../rubocop-1.44.0/lib/rubocop/runner.rb:113:in `each'
.../rubocop-1.44.0/lib/rubocop/runner.rb:113:in `reduce'
.../rubocop-1.44.0/lib/rubocop/runner.rb:113:in `each_inspected_file'
.../rubocop-1.44.0/lib/rubocop/runner.rb:99:in `inspect_files'
.../rubocop-1.44.0/lib/rubocop/runner.rb:52:in `run'
.../rubocop-1.44.0/lib/rubocop/cli/command/execute_runner.rb:26:in `block in execute_runner'
.../rubocop-1.44.0/lib/rubocop/cli/command/execute_runner.rb:52:in `with_redirect'
.../rubocop-1.44.0/lib/rubocop/cli/command/execute_runner.rb:25:in `execute_runner'
.../rubocop-1.44.0/lib/rubocop/cli/command/execute_runner.rb:17:in `run'
.../rubocop-1.44.0/lib/rubocop/cli/command.rb:11:in `run'
.../rubocop-1.44.0/lib/rubocop/cli/environment.rb:18:in `run'
.../rubocop-1.44.0/lib/rubocop/cli.rb:72:in `run_command'
.../rubocop-1.44.0/lib/rubocop/cli.rb:79:in `execute_runners'
.../rubocop-1.44.0/lib/rubocop/cli.rb:48:in `run'
.../rubocop-1.44.0/exe/rubocop:19:in `block in <top (required)>'
.../lib/ruby/3.1.0/benchmark.rb:311:in `realtime'
.../rubocop-1.44.0/exe/rubocop:19:in `<top (required)>'
.../bin/rubocop:25:in `load'
.../bin/rubocop:25:in `<main>'
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Lint/Void cop was inspecting .../main1.rb:3:0.
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:
1.44.0 (using Parser 3.2.0.0, rubocop-ast 1.24.1, running on ruby 3.1.1) [x86_64-darwin20]
Finished in 0.17194200000085402 seconds
$ 

Steps to reproduce the problem

.rubocop.yml

AllCops:
  NewCops: enable

Lint/Void:
  CheckForMethodsWithNoSideEffects: true

main1.rb

# frozen_string_literal: true

foo = bar
baz

main2.rb

# frozen_string_literal: true

module Foo
end

module Bar
end

main3.rb

# frozen_string_literal: true

if foo
end
bar

RuboCop version

$ rubocop -V
1.44.0 (using Parser 3.2.0.0, rubocop-ast 1.24.1, running on ruby 3.1.1) [x86_64-darwin20]
$