Layout/EmptyLinesAroundAttributeAccessor fails with error when variable with name attr is used

[kewlar]

Rubocop Layout/EmptyLinesAroundAttributeAccessor inspection fails with an exception when it meets a variable named attr, as in:

class Foo
  def foo
    attr.foo
  end
end

---

Expected behavior

The code should be fine:

Inspecting 1 file
.

1 file inspected, no offenses detected

Actual behavior

Rubocop errors out:

An error occurred while Layout/EmptyLinesAroundAttributeAccessor cop was inspecting /Users/me/dev/spikes/rubocop-test/test.rb:3:4.
undefined method `send_type?' for :foo:Symbol
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/layout/empty_lines_around_attribute_accessor.rb:63:in `attribute_accessor?'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/layout/empty_lines_around_attribute_accessor.rb:39:in `on_send'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/commissioner.rb:57:in `block (2 levels) in trigger_responding_cops'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/commissioner.rb:136:in `with_cop_error_handling'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/commissioner.rb:56:in `block in trigger_responding_cops'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/commissioner.rb:55:in `each'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/commissioner.rb:55:in `trigger_responding_cops'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/commissioner.rb:32:in `block (2 levels) in <class:Commissioner>'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/ast/traversal.rb:114:in `block in on_send'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/ast/traversal.rb:111:in `each'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/ast/traversal.rb:111:in `each_with_index'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/ast/traversal.rb:111:in `on_send'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/commissioner.rb:33:in `block (2 levels) in <class:Commissioner>'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/ast/traversal.rb:107:in `on_def'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/commissioner.rb:33:in `block (2 levels) in <class:Commissioner>'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/ast/traversal.rb:99:in `on_class'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/commissioner.rb:33:in `block (2 levels) in <class:Commissioner>'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/ast/traversal.rb:14:in `walk'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/commissioner.rb:44:in `investigate'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/team.rb:124:in `investigate'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/team.rb:112:in `offenses'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cop/team.rb:44:in `inspect_file'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:301:in `inspect_file'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:249:in `block in do_inspection_loop'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:281:in `block in iterate_until_no_changes'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:274:in `loop'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:274:in `iterate_until_no_changes'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:245:in `do_inspection_loop'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:124:in `block in file_offenses'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:148:in `file_offense_cache'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:122:in `file_offenses'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:113:in `process_file'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:92:in `block in each_inspected_file'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:91:in `each'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:91:in `reduce'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:91:in `each_inspected_file'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:78:in `inspect_files'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/runner.rb:39:in `run'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cli/command/execute_runner.rb:21:in `execute_runner'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cli/command/execute_runner.rb:13:in `run'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cli/command.rb:10:in `run'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cli/environment.rb:17:in `run'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cli.rb:65:in `run_command'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cli.rb:72:in `execute_runners'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/lib/rubocop/cli.rb:41:in `run'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/exe/rubocop:13:in `block in <top (required)>'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/benchmark.rb:308:in `realtime'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.83.0/exe/rubocop:12:in `<top (required)>'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/bin/rubocop:23:in `load'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/bin/rubocop:23:in `<top (required)>'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli/exec.rb:63:in `load'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli/exec.rb:63:in `kernel_load'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli/exec.rb:28:in `run'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli.rb:476:in `exec'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor.rb:399:in `dispatch'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli.rb:30:in `dispatch'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/base.rb:476:in `start'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli.rb:24:in `start'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle:46:in `block in <top (required)>'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/friendly_errors.rb:123:in `with_friendly_errors'
/Users/me/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle:34:in `<top (required)>'
/Users/me/.rbenv/versions/2.7.1/bin/bundle:23:in `load'
/Users/me/.rbenv/versions/2.7.1/bin/bundle:23:in `<main>'
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Layout/EmptyLinesAroundAttributeAccessor cop was inspecting /Users/me/dev/spikes/rubocop-test/test.rb:3:4.

NOTE for master branch: When testing on master branch, the error is undefined method 'alias_type?' for :foo:Symbol instead of undefined method 'send_type?' for :foo:Symbol

Steps to reproduce the problem

Create test.rb with the following content:

class Foo
  def foo
    attr.foo
  end
end

Run Rubocop inspection on it:

rubocop --only Layout/EmptyLinesAroundAttributeAccessor test.rb

RuboCop version

Tested on Rubocop 0.83.0, and master@8376d3dc5a6e

$ bundle exec rubocop -V
0.83.0 (using Parser 2.7.1.2, running on ruby 2.7.1 x86_64-darwin18)

When testing on master branch, the error is undefined method 'alias_type?' for :foo:Symbol instead of undefined method 'send_type?' for :foo:Symbol