class Rubocop::Cop::Style::SymbolArray

This check makes sense only on Ruby 2.0+.
that are not using the %i() syntax.
This cop checks for array literals made up of symbols

def on_array(node) 

def on_array(node)
  # %i and %I were introduced in Ruby 2.0
  unless RUBY_VERSION < '2.0.0'
    add_offense(node, :expression) if array_of?(:sym, node)
  end
end