René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Lint/UselessAssignment: false positives with `+=`","articleBody":"`Lint/UselessAssignment` reports false positives even after `1.79.1` and https://github.com/rubocop/rubocop/pull/14409\n\n## Expected behavior\n\nrubocop should not report a violation\n\n## Actual behavior\n\nRubocop reports lines 8 and 12 are useless assignments, but not 16 for some reason. If I remove line 4, then the false positives are eliminated.\n\n## Steps to reproduce the problem\n\n```ruby\ndef parse_options\n  index = -1\n  while loop_cond\n    index += 1\n\n    item = command_line.args[index]\n    if option\n      index += 1\n    else\n      option = foo(item)\n      if option\n        index += 1\n      else\n        option = bar(item)\n        if option\n          index += 1\n        end\n      end\n    end\n  end\nend\n```\n```\n❯ git rev-parse HEAD\neb470cef93cacb1e8806c6202e976d5693f91b3d\n\n❯ rm -rf /home/josh/.cache/rubocop_cache\n\n❯ bundle exec rubocop --debug --only Lint/UselessAssignment example.rb\nFor /home/josh/work/rubocop: configuration from /home/josh/work/rubocop/.rubocop.yml\nDefault configuration from /home/josh/work/rubocop/config/default.yml\nPlugin configuration from /home/josh/work/rubocop/config/internal_affairs.yml\nPlugin configuration from /home/josh/.rbenv/versions/3.2.5/lib/ruby/gems/3.2.0/gems/rubocop-performance-1.25.0/config/default.yml\nPlugin configuration from /home/josh/.rbenv/versions/3.2.5/lib/ruby/gems/3.2.0/gems/rubocop-rake-0.7.1/config/default.yml\nPlugin configuration from /home/josh/.rbenv/versions/3.2.5/lib/ruby/gems/3.2.0/gems/rubocop-rspec-3.6.0/config/default.yml\nInheriting configuration from /home/josh/work/rubocop/.rubocop_todo.yml\nUse parallel by default.\nSkipping parallel inspection: only a single file needs inspection\nInspecting 1 file\nScanning /home/josh/work/rubocop/example.rb\nW\n\nOffenses:\n\nexample.rb:8:7: W: [Correctable] Lint/UselessAssignment: Useless assignment to variable - index.\n      index += 1\n      ^^^^^\nexample.rb:12:9: W: [Correctable] Lint/UselessAssignment: Useless assignment to variable - index.\n        index += 1\n        ^^^^^\n\n1 file inspected, 2 offenses detected, 2 offenses autocorrectable\nFinished in 0.25948607735335827 seconds\n```\n\n## RuboCop version\n\n```\n❯ bundle exec rubocop -V \n1.79.1 (using Parser 3.3.9.0, rubocop-ast 1.46.0, analyzing as Ruby 2.7, running on ruby 3.2.5) [x86_64-linux]\n  - rubocop-performance 1.25.0\n  - rubocop-rake 0.7.1\n  - rubocop-rspec 3.6.0\n\n```","author":{"url":"https://github.com/joshcooper","@type":"Person","name":"joshcooper"},"datePublished":"2025-08-04T17:02:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/14419/rubocop/issues/14419"}