Failure in Layout/SpaceAroundMethodCallOperator - undefined method `begin_pos' for nil:NilClass

[ms-ati]

Expected behavior

Given a Guardfile with the following lines:

  watch(rails.controllers) do |m|
    [
      rspec.spec.("routing/#{m[1]}_routing"),
      rspec.spec.("controllers/#{m[1]}_controller"),
      rspec.spec.("acceptance/#{m[1]}")
    ]
  end

We expect Rubocop to run all specs without raising internal errors.

Actual behavior

Rubocop 0.88.0 is raising errors in the cop Layout/SpaceAroundMethodCallOperator when inspecting such a Guardfile.

Specifically, the code in the form rspec.( appears to trigger the following error in Rubocop:

An error occurred while Layout/SpaceAroundMethodCallOperator cop was inspecting /app/Guardfile:50:6.
undefined method `begin_pos' for nil:NilClass
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/layout/space_around_method_call_operator.rb:69:in `check_space_after_dot'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/layout/space_around_method_call_operator.rb:49:in `on_send'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:91:in `block (2 levels) in trigger_responding_cops'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:113:in `with_cop_error_handling'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:90:in `block in trigger_responding_cops'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:89:in `each'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:89:in `trigger_responding_cops'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:61:in `block (2 levels) in <class:Commissioner>'
/bundle/gems/rubocop-ast-0.3.0/lib/rubocop/ast/traversal.rb:59:in `block in on_array'
/bundle/gems/rubocop-ast-0.3.0/lib/rubocop/ast/traversal.rb:59:in `each'
/bundle/gems/rubocop-ast-0.3.0/lib/rubocop/ast/traversal.rb:59:in `on_array'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:62:in `block (2 levels) in <class:Commissioner>'
/bundle/gems/rubocop-ast-0.3.0/lib/rubocop/ast/traversal.rb:173:in `on_block'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:62:in `block (2 levels) in <class:Commissioner>'
/bundle/gems/rubocop-ast-0.3.0/lib/rubocop/ast/traversal.rb:59:in `block in on_begin'
/bundle/gems/rubocop-ast-0.3.0/lib/rubocop/ast/traversal.rb:59:in `each'
/bundle/gems/rubocop-ast-0.3.0/lib/rubocop/ast/traversal.rb:59:in `on_begin'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:62:in `block (2 levels) in <class:Commissioner>'
/bundle/gems/rubocop-ast-0.3.0/lib/rubocop/ast/traversal.rb:173:in `on_block'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:62:in `block (2 levels) in <class:Commissioner>'
/bundle/gems/rubocop-ast-0.3.0/lib/rubocop/ast/traversal.rb:14:in `walk'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/commissioner.rb:74:in `investigate'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/team.rb:151:in `investigate_partial'
/bundle/gems/rubocop-0.88.0/lib/rubocop/cop/team.rb:83:in `investigate'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:295:in `inspect_file'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:245:in `block in do_inspection_loop'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:277:in `block in iterate_until_no_changes'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:270:in `loop'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:270:in `iterate_until_no_changes'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:241:in `do_inspection_loop'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:121:in `block in file_offenses'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:146:in `file_offense_cache'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:120:in `file_offenses'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:111:in `process_file'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:90:in `block in each_inspected_file'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:89:in `each'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:89:in `reduce'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:89:in `each_inspected_file'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:78:in `inspect_files'
/bundle/gems/rubocop-0.88.0/lib/rubocop/runner.rb:39:in `run'

Steps to reproduce the problem

Run rubocop against a Guardfile like this one:
http://alfredoroca.github.io/spring/guard/test/2015/07/13/spring-guard

RuboCop version

$ bundle exec rubocop -V
0.88.0 (using Parser 2.7.1.4, rubocop-ast 0.3.0, running on ruby 2.5.3 x86_64-linux)

[koic]

This issue is a dup with #8324 and solved by #8328. Thank you for your feedback!