class RuboCop::Cop::Lint::UnusedMethodArgument

end
puts used
def some_method(used, _unused, _unused_but_allowed)
# good
@example
end
puts used
def some_method(used, unused, _unused_but_allowed)
# bad
@example
This cop checks for unused method arguments.

def check_argument(variable) 

def check_argument(variable)
  return unless variable.method_argument?
  return if variable.keyword_argument? &&
            cop_config['AllowUnusedKeywordArguments']
  if cop_config['IgnoreEmptyMethods']
    _name, _args, body = *variable.scope.node
    return if body.nil?
  end
  super
end

def message(variable) 

def message(variable)
  message = String.new("Unused method argument - `#{variable.name}`.")
  unless variable.keyword_argument?
    message << " If it's necessary, use `_` or `_#{variable.name}` " \
               "as an argument name to indicate that it won't be used."
  end
  scope = variable.scope
  all_arguments = scope.variables.each_value.select(&:method_argument?)
  if all_arguments.none?(&:referenced?)
    message << " You can also write as `#{scope.name}(*)` " \
               'if you want the method to accept any arguments ' \
               "but don't care about them."
  end
  message
end