Lint/BinaryOperatorWithIdenticalOperands error

[aglushkov]

Rubocop raises error when using redefined + method

An error occurred while Lint/BinaryOperatorWithIdenticalOperands cop was inspecting /app/uploaders/image_processors/adapters/magick/gif.rb:17:14.
undefined method `basic_literal?' for nil:NilClass
gems/rubocop-0.89.1/lib/rubocop/cop/lint/binary_operator_with_identical_operands.rb:38:in `on_send'
gems/rubocop-0.89.1/lib/rubocop/cop/commissioner.rb:91:in `block (2 levels) in trigger_responding_cops'
gems/rubocop-0.89.1/lib/rubocop/cop/commissioner.rb:112:in `with_cop_error_handling'

Steps to reproduce the problem

Check this code with rubocop -d --only Lint/BinaryOperatorWithIdenticalOperands

class ImageProcessors::Adapters::Magick::Gif < ImageProcessors::Adapters::Magick::Base
  private

  def call(opts)
    builder = ImageProcessing::MiniMagick
    builder = builder.coalesce
    builder = builder.dither.+ # #https://github.com/minimagick/minimagick/blob/d484786f35e91f107836d3c86aca61d50a35820b/lib/mini_magick/tool.rb#L172
    builder = crop(builder, opts)
    builder = resize(builder, opts)
    builder = builder.fuzz('5%')
    builder = builder.map.+
    builder.layers('optimize')
  end
end

RuboCop version

$ bundle exec rubocop -V
0.89.1 (using Parser 2.7.1.4, rubocop-ast 0.3.0, running on ruby 2.6.6 x86_64-linux)

[marcandre]

Sorry for this issue. This is fixed in #8534 but not yet released.
Thanks for the bug report