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Showing content from https://github.com/rubocop/rubocop/issues/14336 below:

Invalid autocorrection of Style/ItBlockParameter · Issue #14336 · rubocop/rubocop · GitHub

rubocop incorrectly identifies and incorrectly autocorrects the following code:

# frozen_string_literal: true

##############################################################################
# Good examples: rubocop v1.77.0 gets these right:

foo { transform1 _1 }         # rubocop correctly updates this block
foo { transform2 _1, _2 }     # rubocop correctly ignores this block

foo { transform2 _1, _2 }     # rubocop correctly ignores this block
  .bar { transform2 _1, _2 }  # rubocop correctly ignores this block

foo { transform1 _1 }         # rubocop correctly updates this block
  .bar { transform2 _1, _2 }  # rubocop correctly ignores this block

foo { transform2 _1, _2 }     # rubocop correctly ignores this block
  .intervening
  .methods(calls) { etc }
  .bar { transform2 _1, _2 }  # rubocop correctly ignores this block

##############################################################################
# Bad examples: rubocop v1.77.0 gets these wrong:

foo { transform2 _1, _2 }     # rubocop INCORRECTLY updates this block <-- BUG
  .bar { transform1 _1 }      # rubocop correctly   updates this block

foo { transform1 _1 }         # rubocop correctly   updates this block
  .baz { transform2 _1, _2 }  # rubocop INCORRECTLY updates this block <-- BUG
  .qux { transform1 _1 }      # rubocop correctly   updates this block

foo { transform2 _1, _2 }     # rubocop INCORRECTLY updates this block <-- BUG
  .intervening
  .methods(calls) { etc }
  .bar { transform1 _1 }      # rubocop correctly   updates this block

Use the following config to reproduce:

AllCops:
  NewCops: enable
  TargetRubyVersion: 3.4

In the example above, the lines commented <-- BUG should not be identified as offences nor autocorrected.

The example lines will be identified as errors and autocorrected. This creates syntax errors on the lines which should not have been changed.

For example:

foo { transform2 it, _2 }  # <-- SyntaxError
  .bar { transform1 it }

Use the .rubocop.yml and example.rb files, provided above. Run rubocop example.rb and rubocop -a example.rb

This happens with both RUBYOPT=--parser=parse.y and RUBYOPT=--parser=prism. (I don't know if that makes any difference elsewhere, but it also doesn't make any difference here.)

$ rubocop -V
1.77.0 (using Parser 3.3.8.0, Prism 1.4.0, rubocop-ast 1.45.1, analyzing as Ruby 3.4, running on ruby 3.4.4) [x86_64-linux
]

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