Style/BisectedAttrAccessor cop fails when attr_reader is not used in a normal way

[cohei]

Style/BisectedAttrAccessor cop fails when attr_reader receives a variable with splat.

---

Expected behavior

Success without error.

Actual behavior

Error occurs.

Steps to reproduce the problem

Make this file

# reproduce.rb
class C
  ATTRIBUTES = %i[a b]
  attr_reader(*ATTRIBUTES)
end

then

$ rubocop -d --only Style/BisectedAttrAccessor reproduce.rb 

output

For /: Default configuration from /usr/local/bundle/gems/rubocop-0.87.0/config/default.yml
Inspecting 1 file
Scanning /reproduce.rb
An error occurred while Style/BisectedAttrAccessor cop was inspecting /reproduce.rb:1:0.
undefined method `value' for s(:splat,
  s(:const, nil, :ATTRIBUTES)):RuboCop::AST::Node
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/style/bisected_attr_accessor.rb:50:in `map'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/style/bisected_attr_accessor.rb:50:in `block in accessor_names'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/style/bisected_attr_accessor.rb:49:in `each'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/style/bisected_attr_accessor.rb:49:in `accessor_names'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/style/bisected_attr_accessor.rb:27:in `on_class'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/commissioner.rb:91:in `block (2 levels) in trigger_responding_cops'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/commissioner.rb:113:in `with_cop_error_handling'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/commissioner.rb:90:in `block in trigger_responding_cops'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/commissioner.rb:89:in `each'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/commissioner.rb:89:in `trigger_responding_cops'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/commissioner.rb:61:in `block (2 levels) in <class:Commissioner>'
/usr/local/bundle/gems/rubocop-ast-0.1.0/lib/rubocop/ast/traversal.rb:14:in `walk'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/commissioner.rb:74:in `investigate'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/team.rb:151:in `investigate_partial'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cop/team.rb:83:in `investigate'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:296:in `inspect_file'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:246:in `block in do_inspection_loop'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:278:in `block in iterate_until_no_changes'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:271:in `loop'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:271:in `iterate_until_no_changes'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:242:in `do_inspection_loop'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:122:in `block in file_offenses'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:147:in `file_offense_cache'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:120:in `file_offenses'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:111:in `process_file'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:90:in `block in each_inspected_file'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:89:in `each'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:89:in `reduce'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:89:in `each_inspected_file'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:78:in `inspect_files'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/runner.rb:39:in `run'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cli/command/execute_runner.rb:21:in `execute_runner'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cli/command/execute_runner.rb:13:in `run'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cli/command.rb:10:in `run'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cli/environment.rb:17:in `run'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cli.rb:65:in `run_command'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cli.rb:72:in `execute_runners'
/usr/local/bundle/gems/rubocop-0.87.0/lib/rubocop/cli.rb:41:in `run'
/usr/local/bundle/gems/rubocop-0.87.0/exe/rubocop:13:in `block in <top (required)>'
/usr/local/lib/ruby/2.7.0/benchmark.rb:308:in `realtime'
/usr/local/bundle/gems/rubocop-0.87.0/exe/rubocop:12:in `<top (required)>'
/usr/local/bundle/bin/rubocop:23:in `load'
/usr/local/bundle/bin/rubocop:23:in `<main>'
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Style/BisectedAttrAccessor cop was inspecting /reproduce.rb:1:0.
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
https://github.com/rubocop-hq/rubocop/issues

Mention the following information in the issue report:
0.87.0 (using Parser 2.7.1.4, rubocop-ast 0.1.0, running on ruby 2.7.1 x86_64-linux)
Finished in 0.17187920000287704 seconds

RuboCop version

$ rubocop -V
0.87.0 (using Parser 2.7.1.4, rubocop-ast 0.1.0, running on ruby 2.7.1 x86_64-linux)

[bbatsov]

@fatkodima Can you look into this?