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Showing content from https://github.com/rubocop/rubocop/issues/14189 below:

Layout/SpaceBeforeBrackets generates invalid code · Issue #14189 · rubocop/rubocop · GitHub

Continuation of #9499

foo = "hello world!"
foo      [  6, 5]  = "rubocop"
foo

$ rubocop -a --only Layout/SpaceBeforeBrackets foo.rb
Inspecting 1 file
F

Offenses:

foo.rb:2:4: C: [Corrected] Layout/SpaceBeforeBrackets: Remove the space before the opening brackets.
foo      [  6, 5]  = "rubocop"
   ^^^^^^^^
foo.rb:2:9: F: Lint/Syntax: unexpected token tRBRACK
(Using Ruby 2.7 parser; configure using TargetRubyVersion parameter, under AllCops)
foo 6, 5]  = "rubocop"
        ^

1 file inspected, 2 offenses detected, 1 offense corrected

foo = "hello world!"
foo 6, 5]  = "rubocop"
foo

The code is now invalid:

 ruby foo.rb 
foo.rb: --> foo.rb
Unmatched `]', missing `[' ?
> 1  foo = "hello world!"
> 2  foo 6, 5]  = "rubocop"

foo.rb:2: syntax error, unexpected ']', expecting end-of-input (SyntaxError)
foo 6, 5]  = "rubocop"

$ bundle exec rubocop -V
1.75.6 (using Parser 3.3.8.0, rubocop-ast 1.44.1, analyzing as Ruby 2.7, running on ruby 3.2.5) [x86_64-darwin23]

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