Style/SymbolProc false positive with unused argument

[vlad-pisanov]

Consider:

cat = Cat.new
[1, 2, 3].map { |_i| cat.meow }

Expected behavior

Should not register any offenses.

Actual behavior

Rubocop registers Style/SymbolProc offense: [Correctable] Style/SymbolProc: Pass &:meow as an argument to map instead of a block.

With the -A option, it autocorrects to:

cat = Cat.new
[1, 2, 3].map(&:meow)

RuboCop version

NOTE: this appears to be a regression because version 1.4.2 doesn't exhibit this behavior. Likely related to: #9232

1.6.1 (using Parser 2.7.2.0, rubocop-ast 1.3.0, running on ruby 2.4.5 x86_64-darwin19)
  - rubocop-minitest 0.10.1
  - rubocop-performance 1.9.1
  - rubocop-rails 2.9.1

[marcandre]

Thanks for the report.
I don't think this was caused by #9232, but maybe by #9127?
@dvandersluis would you like to check this out?

[dvandersluis]

Sure thing!