class RuboCop::Cop::Style::RedundantException

raise ‘message’
# Good
raise RuntimeError.new(‘message’)
# Bad
raise RuntimeError, ‘message’
# Bad
@example
It checks for code like this:
This cop checks for RuntimeError as the argument of raise/fail.

def autocorrect(node)

`raise RuntimeError.new('message')` to `raise 'message'`.
Switch `raise RuntimeError, 'message'` to `raise 'message'`, and 
def autocorrect(node)
  exploded?(node) do |command, message|
    return lambda do |corrector|
      corrector.replace(node.source_range,
                        "#{command} #{message.source}")
    end
  end
  compact?(node) do |new_call, message|
    lambda do |corrector|
      corrector.replace(new_call.source_range, message.source)
    end
  end
end

def on_send(node) 

def on_send(node)
  exploded?(node) { return add_offense(node, :expression, MSG_1) }
  compact?(node) { add_offense(node, :expression, MSG_2) }
end