class RuboCop::Cop::Style::OpMethod

parameter named ‘other`.
This cop makes sure that certain operator methods have their sole

def on_def(node) 

def on_def(node)
  name, args, _body = *node
  return unless op_method?(name) &&
                args.children.size == 1 &&
                !TARGET_ARGS.include?(args)
  add_offense(args.children[0], :expression, format(MSG, name))
end

def op_method?(name) 

def op_method?(name)
  return false if BLACKLISTED.include?(name)
  name !~ /\A\w/ || OP_LIKE_METHODS.include?(name)
end