class RuboCop::Cop::Style::DoubleNegation

def on_send(node)
  return unless double_negative?(node) && node.prefix_bang?
  return if style == :allowed_in_returns && allowed_in_returns?(node)
  location = node.loc.selector
  add_offense(location) do |corrector|
    corrector.remove(location)
    corrector.insert_after(node, '.nil?')
  end
end