error occurred while Style/SingleArgumentDig cop was inspecting

[Ivanov-Anton]

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---

Expected behavior

Describe here how you expected RuboCop to behave in this particular situation.

I expect that rubocop correct all offenses without any errors

Actual behavior

rubocop_example@Admins-MacBook-Pro ~ % rubocop example_spec.rb --only Style/SingleArgumentDig -A
Inspecting 1 file
An error occurred while Style/SingleArgumentDig cop was inspecting /Users/anton.i/example_spec.rb:1:0.
To see the complete backtrace run rubocop -d.
C

Offenses:

example_spec.rb:1:1: C: [Corrected] Style/SingleArgumentDig: Use example_evidence.dig('supporting_messages')[0]['name'] instead of example_evidence.dig('supporting_messages')[0].dig('name').
example_evidence.dig('supporting_messages')[0].dig('name')
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
example_spec.rb:1:1: C: [Corrected] Style/SingleArgumentDig: Use example_evidence['supporting_messages'] instead of example_evidence.dig('supporting_messages').
example_evidence.dig('supporting_messages')[0]['name']
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

1 file inspected, 2 offenses detected, 2 offenses corrected

1 error occurred:
An error occurred while Style/SingleArgumentDig cop was inspecting /Users/anton.i/example_spec.rb:1:0.
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:
1.26.1 (using Parser 3.1.1.0, rubocop-ast 1.16.0, running on ruby 2.7.3 x86_64-darwin17)

Describe here what actually happened.
Please use rubocop --debug when pasting rubocop output as it contains additional information.

For /Users/rubocop_example: Default configuration from /Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/config/default.yml
Inspecting 1 file
Scanning /Users/rubocop_example/example_spec.rb
An error occurred while Style/SingleArgumentDig cop was inspecting /Users/rubocop_example/example_spec.rb:1:0.
Parser::Source::TreeRewriter detected clobbering
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter.rb:427:in `trigger_policy'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter.rb:414:in `enforce_policy'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:233:in `call'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:233:in `swallow'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:97:in `with'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:124:in `place_in_hierarchy'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:106:in `do_combine'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:117:in `place_in_hierarchy'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:131:in `block in combine_children'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:130:in `each'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:130:in `inject'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:130:in `combine_children'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:221:in `merge'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:104:in `do_combine'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter/action.rb:30:in `combine'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/parser-3.1.1.0/lib/parser/source/tree_rewriter.rb:143:in `merge!'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/base.rb:291:in `apply_correction'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/base.rb:375:in `attempt_correction'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/base.rb:356:in `use_corrector'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/base.rb:350:in `correct'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/base.rb:127:in `add_offense'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/style/single_argument_dig.rb:52:in `on_send'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/commissioner.rb:136:in `public_send'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/commissioner.rb:136:in `block (2 levels) in trigger_restricted_cops'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/commissioner.rb:160:in `with_cop_error_handling'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/commissioner.rb:135:in `block in trigger_restricted_cops'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/commissioner.rb:134:in `each'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/commissioner.rb:134:in `trigger_restricted_cops'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/commissioner.rb:70:in `on_send'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-ast-1.16.0/lib/rubocop/ast/traversal.rb:158:in `block in on_send'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-ast-1.16.0/lib/rubocop/ast/traversal.rb:155:in `each'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-ast-1.16.0/lib/rubocop/ast/traversal.rb:155:in `each_with_index'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-ast-1.16.0/lib/rubocop/ast/traversal.rb:155:in `on_send'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/commissioner.rb:71:in `on_send'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-ast-1.16.0/lib/rubocop/ast/traversal.rb:158:in `block in on_send'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-ast-1.16.0/lib/rubocop/ast/traversal.rb:155:in `each'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-ast-1.16.0/lib/rubocop/ast/traversal.rb:155:in `each_with_index'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-ast-1.16.0/lib/rubocop/ast/traversal.rb:155:in `on_send'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/commissioner.rb:71:in `on_send'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-ast-1.16.0/lib/rubocop/ast/traversal.rb:20:in `walk'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/commissioner.rb:86:in `investigate'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/team.rb:155:in `investigate_partial'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cop/team.rb:77:in `investigate'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:309:in `inspect_file'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:253:in `block in do_inspection_loop'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:287:in `block in iterate_until_no_changes'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:280:in `loop'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:280:in `iterate_until_no_changes'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:249:in `do_inspection_loop'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:130:in `block in file_offenses'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:155:in `file_offense_cache'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:129:in `file_offenses'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:120:in `process_file'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:101:in `block in each_inspected_file'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:100:in `each'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:100:in `reduce'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:100:in `each_inspected_file'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:86:in `inspect_files'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/runner.rb:47:in `run'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cli/command/execute_runner.rb:26:in `block in execute_runner'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cli/command/execute_runner.rb:52:in `with_redirect'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cli/command/execute_runner.rb:25:in `execute_runner'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cli/command/execute_runner.rb:17:in `run'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cli/command.rb:11:in `run'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cli/environment.rb:18:in `run'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cli.rb:71:in `run_command'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cli.rb:78:in `execute_runners'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/lib/rubocop/cli.rb:47:in `run'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/exe/rubocop:12:in `block in <top (required)>'
/Users/rubocop_example/.rvm/rubies/ruby-2.7.3/lib/ruby/2.7.0/benchmark.rb:308:in `realtime'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/gems/rubocop-1.26.1/exe/rubocop:12:in `<top (required)>'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/bin/rubocop:23:in `load'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/bin/rubocop:23:in `<main>'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/bin/ruby_executable_hooks:22:in `eval'
/Users/rubocop_example/.rvm/gems/ruby-2.7.3/bin/ruby_executable_hooks:22:in `<main>'

Steps to reproduce the problem

1. install rubocop with 1.27.0 version
2. execute in terminal echo 'example_evidence.dig('supporting_messages')[0].dig('name')' >> example.rb
3. execute in terminal rubocop example.rb --only Style/SingleArgumentDig -A

This is extremely important! Providing us with a reliable way to reproduce
a problem will expedite its solution.

RuboCop version

Include the output of rubocop -V or bundle exec rubocop -V if using Bundler.
If you see extension cop versions (e.g. rubocop-performance, rubocop-rspec, and others)
output by rubocop -V, include them as well. Here's an example:

$ [bundle exec] rubocop -V
1.27.0 (using Parser 2.7.2.0, rubocop-ast 1.1.1, running on ruby 2.7.2 x86_64-linux)
  - rubocop-performance 1.9.1
  - rubocop-rspec 2.0.0

1.27.0 (using Parser 3.1.1.0, rubocop-ast 1.16.0, running on ruby 2.7.3 x86_64-darwin17)