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Showing content from https://github.com/rubocop/rubocop/issues/9499 below:

Layout/SpaceBeforeBrackets generates invalid code · Issue #9499 · rubocop/rubocop · GitHub

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

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

Offenses:

foo.rb:2:4: C: [Corrected] Layout/SpaceBeforeBrackets: Remove the space before the opening brackets.
foo[  6, 5]  = "rubocop"
   ^^

###Output

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

The code is now invalid:

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

Include the output of rubocop -V or bundle exec rubocop -V if using Bundler.
If you see extension cop versions (e.g. rubocop-performance, rubocop-rspec, and others)
output by rubocop -V, include them as well. Here's an example:

1.9.1 (using Parser 3.0.0.0, rubocop-ast 1.4.1, running on ruby 2.7.2 x86_64-darwin19)

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